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#include "stdafx.h"
#include "service.h"
#include "log.h"
#include <libcommon/error.h>
#include <libcommon/memory.h>
#undef min
#undef max
#include <chrono>
template<typename TTime = std::chrono::milliseconds>
class TimeBox
{
// `steady_clock` wraps around every ~292 years.
using Clock = std::chrono::steady_clock;
using ClockTimePoint = std::chrono::time_point<Clock>;
public:
TimeBox(typename TTime::rep maxWaitTime)
: m_startTime(Clock::now())
, m_maxWaitTime(TTime(maxWaitTime))
{
}
bool expired() const
{
const auto now = Clock::now();
const auto elapsed =
(
(now < m_startTime)
? (ClockTimePoint::max() - m_startTime) + (now - ClockTimePoint::min())
: now - m_startTime
);
return std::chrono::duration_cast<TTime>(elapsed) > m_maxWaitTime;
}
private:
ClockTimePoint m_startTime;
TTime m_maxWaitTime;
};
SERVICE_STATUS_PROCESS GetServiceProcessStatus(SC_HANDLE service)
{
SERVICE_STATUS_PROCESS ssp;
DWORD bytesNeeded;
auto status = QueryServiceStatusEx
(
service,
SC_STATUS_PROCESS_INFO,
reinterpret_cast<BYTE*>(&ssp),
sizeof(ssp),
&bytesNeeded
);
if (status != 0)
{
return ssp;
}
THROW_WINDOWS_ERROR(GetLastError(), "QueryServiceStatusEx");
}
void WaitUntilServiceStopped(SC_HANDLE service, DWORD maxWaitMs)
{
TimeBox timer(maxWaitMs);
for (;;)
{
try
{
const auto status = GetServiceProcessStatus(service);
if (status.dwCurrentState == SERVICE_STOPPED)
{
return;
}
}
catch (...)
{
}
if (timer.expired())
{
THROW_ERROR("Failed when waiting for service to stop");
}
Sleep(100);
}
}
bool ServiceIsRunning(const std::wstring &serviceName)
{
const auto serviceManager = OpenSCManagerW(nullptr, SERVICES_ACTIVE_DATABASE, SC_MANAGER_ALL_ACCESS);
if (serviceManager == NULL)
{
THROW_WINDOWS_ERROR(GetLastError(), "OpenSCManagerW");
}
common::memory::ScopeDestructor dtor;
dtor += [serviceManager]()
{
CloseServiceHandle(serviceManager);
};
const auto service = OpenServiceW(serviceManager, serviceName.c_str(), SERVICE_ALL_ACCESS);
if (service == NULL)
{
const auto error = GetLastError();
if (error != ERROR_SERVICE_DOES_NOT_EXIST)
{
THROW_WINDOWS_ERROR(error, "OpenServiceW");
}
return false;
}
dtor += [service]()
{
CloseServiceHandle(service);
};
return GetServiceProcessStatus(service).dwCurrentState == SERVICE_RUNNING;
}
void PokeService(const std::wstring &serviceName, bool stopService, bool deleteService)
{
auto serviceManager = OpenSCManagerW(nullptr, SERVICES_ACTIVE_DATABASE, SC_MANAGER_ALL_ACCESS);
if (serviceManager == NULL)
{
THROW_WINDOWS_ERROR(GetLastError(), "OpenSCManagerW");
}
common::memory::ScopeDestructor dtor;
dtor += [serviceManager]()
{
CloseServiceHandle(serviceManager);
};
auto service = OpenServiceW(serviceManager, serviceName.c_str(), SERVICE_ALL_ACCESS);
if (service == NULL)
{
const auto error = GetLastError();
if (error != ERROR_SERVICE_DOES_NOT_EXIST)
{
THROW_WINDOWS_ERROR(error, "OpenServiceW");
}
// If the service does not exist, we're done.
return;
}
dtor += [service]()
{
CloseServiceHandle(service);
};
if (stopService)
{
Log(L"Stopping service");
SERVICE_STATUS ss;
ControlService(service, SERVICE_CONTROL_STOP, &ss);
WaitUntilServiceStopped(service, 1000 * 5);
Log(L"Successfully stopped service");
}
if (deleteService)
{
Log(L"Deleting service");
auto status = DeleteService(service);
if (status == 0)
{
THROW_WINDOWS_ERROR(GetLastError(), "DeleteService");
}
Log(L"Successfully deleted service");
}
}
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