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// Copyright 2018 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.
//go:build windows
package mgr
import (
"errors"
"syscall"
"time"
"unsafe"
"golang.org/x/sys/windows"
)
const (
// Possible recovery actions that the service control manager can perform.
NoAction = windows.SC_ACTION_NONE // no action
ComputerReboot = windows.SC_ACTION_REBOOT // reboot the computer
ServiceRestart = windows.SC_ACTION_RESTART // restart the service
RunCommand = windows.SC_ACTION_RUN_COMMAND // run a command
)
// RecoveryAction represents an action that the service control manager can perform when service fails.
// A service is considered failed when it terminates without reporting a status of SERVICE_STOPPED to the service controller.
type RecoveryAction struct {
Type int // one of NoAction, ComputerReboot, ServiceRestart or RunCommand
Delay time.Duration // the time to wait before performing the specified action
}
// SetRecoveryActions sets actions that service controller performs when service fails and
// the time after which to reset the service failure count to zero if there are no failures, in seconds.
// Specify INFINITE to indicate that service failure count should never be reset.
func (s *Service) SetRecoveryActions(recoveryActions []RecoveryAction, resetPeriod uint32) error {
if recoveryActions == nil {
return errors.New("recoveryActions cannot be nil")
}
actions := []windows.SC_ACTION{}
for _, a := range recoveryActions {
action := windows.SC_ACTION{
Type: uint32(a.Type),
Delay: uint32(a.Delay.Nanoseconds() / 1000000),
}
actions = append(actions, action)
}
rActions := windows.SERVICE_FAILURE_ACTIONS{
ActionsCount: uint32(len(actions)),
Actions: &actions[0],
ResetPeriod: resetPeriod,
}
return windows.ChangeServiceConfig2(s.Handle, windows.SERVICE_CONFIG_FAILURE_ACTIONS, (*byte)(unsafe.Pointer(&rActions)))
}
// RecoveryActions returns actions that service controller performs when service fails.
// The service control manager counts the number of times service s has failed since the system booted.
// The count is reset to 0 if the service has not failed for ResetPeriod seconds.
// When the service fails for the Nth time, the service controller performs the action specified in element [N-1] of returned slice.
// If N is greater than slice length, the service controller repeats the last action in the slice.
func (s *Service) RecoveryActions() ([]RecoveryAction, error) {
b, err := s.queryServiceConfig2(windows.SERVICE_CONFIG_FAILURE_ACTIONS)
if err != nil {
return nil, err
}
p := (*windows.SERVICE_FAILURE_ACTIONS)(unsafe.Pointer(&b[0]))
if p.Actions == nil {
return nil, err
}
actions := unsafe.Slice(p.Actions, int(p.ActionsCount))
var recoveryActions []RecoveryAction
for _, action := range actions {
recoveryActions = append(recoveryActions, RecoveryAction{Type: int(action.Type), Delay: time.Duration(action.Delay) * time.Millisecond})
}
return recoveryActions, nil
}
// ResetRecoveryActions deletes both reset period and array of failure actions.
func (s *Service) ResetRecoveryActions() error {
actions := make([]windows.SC_ACTION, 1)
rActions := windows.SERVICE_FAILURE_ACTIONS{
Actions: &actions[0],
}
return windows.ChangeServiceConfig2(s.Handle, windows.SERVICE_CONFIG_FAILURE_ACTIONS, (*byte)(unsafe.Pointer(&rActions)))
}
// ResetPeriod is the time after which to reset the service failure
// count to zero if there are no failures, in seconds.
func (s *Service) ResetPeriod() (uint32, error) {
b, err := s.queryServiceConfig2(windows.SERVICE_CONFIG_FAILURE_ACTIONS)
if err != nil {
return 0, err
}
p := (*windows.SERVICE_FAILURE_ACTIONS)(unsafe.Pointer(&b[0]))
return p.ResetPeriod, nil
}
// SetRebootMessage sets service s reboot message.
// If msg is "", the reboot message is deleted and no message is broadcast.
func (s *Service) SetRebootMessage(msg string) error {
rActions := windows.SERVICE_FAILURE_ACTIONS{
RebootMsg: syscall.StringToUTF16Ptr(msg),
}
return windows.ChangeServiceConfig2(s.Handle, windows.SERVICE_CONFIG_FAILURE_ACTIONS, (*byte)(unsafe.Pointer(&rActions)))
}
// RebootMessage is broadcast to server users before rebooting in response to the ComputerReboot service controller action.
func (s *Service) RebootMessage() (string, error) {
b, err := s.queryServiceConfig2(windows.SERVICE_CONFIG_FAILURE_ACTIONS)
if err != nil {
return "", err
}
p := (*windows.SERVICE_FAILURE_ACTIONS)(unsafe.Pointer(&b[0]))
return windows.UTF16PtrToString(p.RebootMsg), nil
}
// SetRecoveryCommand sets the command line of the process to execute in response to the RunCommand service controller action.
// If cmd is "", the command is deleted and no program is run when the service fails.
func (s *Service) SetRecoveryCommand(cmd string) error {
rActions := windows.SERVICE_FAILURE_ACTIONS{
Command: syscall.StringToUTF16Ptr(cmd),
}
return windows.ChangeServiceConfig2(s.Handle, windows.SERVICE_CONFIG_FAILURE_ACTIONS, (*byte)(unsafe.Pointer(&rActions)))
}
// RecoveryCommand is the command line of the process to execute in response to the RunCommand service controller action. This process runs under the same account as the service.
func (s *Service) RecoveryCommand() (string, error) {
b, err := s.queryServiceConfig2(windows.SERVICE_CONFIG_FAILURE_ACTIONS)
if err != nil {
return "", err
}
p := (*windows.SERVICE_FAILURE_ACTIONS)(unsafe.Pointer(&b[0]))
return windows.UTF16PtrToString(p.Command), nil
}
// SetRecoveryActionsOnNonCrashFailures sets the failure actions flag. If the
// flag is set to false, recovery actions will only be performed if the service
// terminates without reporting a status of SERVICE_STOPPED. If the flag is set
// to true, recovery actions are also performed if the service stops with a
// nonzero exit code.
func (s *Service) SetRecoveryActionsOnNonCrashFailures(flag bool) error {
var setting windows.SERVICE_FAILURE_ACTIONS_FLAG
if flag {
setting.FailureActionsOnNonCrashFailures = 1
}
return windows.ChangeServiceConfig2(s.Handle, windows.SERVICE_CONFIG_FAILURE_ACTIONS_FLAG, (*byte)(unsafe.Pointer(&setting)))
}
// RecoveryActionsOnNonCrashFailures returns the current value of the failure
// actions flag. If the flag is set to false, recovery actions will only be
// performed if the service terminates without reporting a status of
// SERVICE_STOPPED. If the flag is set to true, recovery actions are also
// performed if the service stops with a nonzero exit code.
func (s *Service) RecoveryActionsOnNonCrashFailures() (bool, error) {
b, err := s.queryServiceConfig2(windows.SERVICE_CONFIG_FAILURE_ACTIONS_FLAG)
if err != nil {
return false, err
}
p := (*windows.SERVICE_FAILURE_ACTIONS_FLAG)(unsafe.Pointer(&b[0]))
return p.FailureActionsOnNonCrashFailures != 0, nil
}