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/**
* \file
* \author Egor Tensin <Egor.Tensin@gmail.com>
* \date 2015
* \copyright This file is licensed under the terms of the MIT License.
* See LICENSE.txt for details.
*/
#include "libservice/common.hpp"
#include "libservice/service.hpp"
#include "libservice/service_handle.hpp"
#include "libservice/service_manager.hpp"
#include "libservice/windows_error.hpp"
#include <Windows.h>
#include <string>
#include <utility>
#include <vector>
namespace libservice
{
namespace
{
ServiceHandle open_service(const ServiceManager& mgr, const std::string& name)
{
const auto raw = OpenServiceA(
static_cast<SC_HANDLE>(mgr),
name.c_str(),
SERVICE_ALL_ACCESS);
if (NULL == raw)
{
const auto ec = GetLastError();
throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
}
return ServiceHandle(raw);
}
ServiceHandle install_service(
const ServiceManager& mgr,
const std::string& name,
const std::string& bin_path)
{
const auto raw = CreateServiceA(
static_cast<SC_HANDLE>(mgr),
name.c_str(),
name.c_str(),
SERVICE_ALL_ACCESS,
SERVICE_KERNEL_DRIVER,
SERVICE_DEMAND_START,
SERVICE_ERROR_NORMAL,
bin_path.c_str(),
NULL,
NULL,
NULL,
NULL,
NULL);
if (NULL == raw)
{
const auto ec = GetLastError();
throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
}
return ServiceHandle(raw);
}
void start_service(const ServiceHandle& handle)
{
if (!StartService(static_cast<SC_HANDLE>(handle), 0, NULL))
{
const auto ec = GetLastError();
throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
}
}
void stop_service(const ServiceHandle& handle)
{
SERVICE_STATUS service_status;
if (!ControlService(static_cast<SC_HANDLE>(handle), SERVICE_CONTROL_STOP, &service_status))
{
const auto ec = GetLastError();
throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
}
}
void uninstall_service(const ServiceHandle& handle)
{
if (!DeleteService(static_cast<SC_HANDLE>(handle)))
{
const auto ec = GetLastError();
throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
}
}
bool does_service_exist(const ServiceManager& mgr,
const std::string& name)
{
const auto raw = OpenService(static_cast<SC_HANDLE>(mgr),
name.c_str(),
SERVICE_QUERY_STATUS);
if (NULL != raw)
{
ServiceHandle handle(raw);
return true;
}
const auto ec = GetLastError();
switch (ec)
{
case ERROR_SERVICE_DOES_NOT_EXIST:
return false;
default:
throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
}
}
SERVICE_STATUS_PROCESS query_service_status(const ServiceHandle& handle)
{
SERVICE_STATUS_PROCESS status;
DWORD nbreq;
if (!QueryServiceStatusEx(static_cast<SC_HANDLE>(handle),
SC_STATUS_PROCESS_INFO,
reinterpret_cast<BYTE*>(&status),
sizeof(status),
&nbreq))
{
const auto ec = GetLastError();
throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
}
return status;
}
DWORD query_service_state(const ServiceHandle& handle)
{
return query_service_status(handle).dwCurrentState;
}
SERVICE_STATUS_PROCESS wait_for_service_state(
const ServiceHandle& handle,
const DWORD desired_state)
{
auto status = query_service_status(handle);
DWORD old_timestamp = GetTickCount();
DWORD old_check_point = status.dwCheckPoint;
DWORD old_wait_hint = status.dwWaitHint;
while (desired_state != status.dwCurrentState)
{
DWORD wait_time = old_wait_hint / 10;
if (wait_time < 1000)
wait_time = 1000;
else if (wait_time > 10000)
wait_time = 10000;
Sleep(wait_time);
status = query_service_status(handle);
if (desired_state == status.dwCurrentState)
break;
if (status.dwCheckPoint > old_check_point)
{
old_timestamp = GetTickCount();
old_check_point = status.dwCheckPoint;
old_wait_hint = status.dwWaitHint;
}
else if (GetTickCount() - old_timestamp > old_wait_hint)
{
return status;
}
}
return status;
}
}
Service Service::open(const ServiceManager& mgr, const std::string& name)
{
return Service(open_service(mgr, name));
}
Service Service::install(const ServiceManager& mgr,
const std::string& name,
const std::string& bin_path)
{
return Service(install_service(mgr, name, bin_path));
}
bool Service::does_exist(const ServiceManager& mgr,
const std::string& name)
{
return does_service_exist(mgr, name);
}
void Service::start() const
{
const auto state = query_service_state(m_handle);
switch (state)
{
case SERVICE_STOPPED:
break;
case SERVICE_STOP_PENDING:
wait_for_service_state(m_handle, SERVICE_STOPPED);
break;
default:
return;
}
start_service(m_handle);
wait_for_service_state(m_handle, SERVICE_RUNNING);
}
void Service::stop() const
{
switch (query_service_state(m_handle))
{
case SERVICE_STOPPED:
return;
case SERVICE_STOP_PENDING:
wait_for_service_state(m_handle, SERVICE_STOPPED);
return;
}
stop_service(m_handle);
wait_for_service_state(m_handle, SERVICE_STOPPED);
}
void Service::uninstall() const
{
stop();
uninstall_service(m_handle);
}
void swap(Service& a, Service& b) LIBSERVICE_NOEXCEPT
{
a.swap(b);
}
}
namespace std
{
template <>
void swap<libservice::Service>(
libservice::Service& a,
libservice::Service& b) LIBSERVICE_NOEXCEPT
{
a.swap(b);
}
}
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