transmission/daemon/daemon-win32.cc

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// This file Copyright © 2015-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <process.h> /* _beginthreadex() */
#include <windows.h>
#include <algorithm> /* std::max() */
#include <fmt/format.h>
#include "daemon.h"
#ifndef SERVICE_ACCEPT_PRESHUTDOWN
#define SERVICE_ACCEPT_PRESHUTDOWN 0x00000100
#endif
#ifndef SERVICE_CONTROL_PRESHUTDOWN
#define SERVICE_CONTROL_PRESHUTDOWN 0x0000000F
#endif
static LPCWSTR const service_name = L"TransmissionDaemon";
// If we can get rid of this global variable...
static tr_daemon* daemon;
// ...these becomes a good candidates for being converted to 'class tr_daemon' members.
static SERVICE_STATUS_HANDLE status_handle = nullptr;
static DWORD current_state = SERVICE_STOPPED;
static HANDLE service_thread = nullptr;
static HANDLE service_stop_thread = nullptr;
static void set_system_error(tr_error** error, DWORD code, char const* message)
{
auto const system_message = tr_win32_format_message(code);
tr_error_set(error, code, fmt::format(FMT_STRING("{:s} ({:#08x}): {:s})"), message, code, system_message));
}
static void do_log_system_error(char const* file, int line, tr_log_level level, DWORD code, char const* message)
{
auto const system_message = tr_win32_format_message(code);
tr_logAddMessage(file, line, level, "tr_daemon", fmt::format("[tr_daemon] {} ({:#x}): {}", message, code, system_message));
}
#define log_system_error(level, code, message) \
do \
{ \
DWORD const local_code = (code); \
\
if (tr_logLevelIsActive((level))) \
{ \
do_log_system_error(__FILE__, __LINE__, (level), local_code, (message)); \
} \
} while (0)
static BOOL WINAPI handle_console_ctrl(DWORD /*control_type*/)
{
daemon->stop();
return TRUE;
}
static void update_service_status(
DWORD new_state,
DWORD win32_exit_code,
DWORD service_specific_exit_code,
DWORD check_point,
DWORD wait_hint)
{
SERVICE_STATUS status;
status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
status.dwCurrentState = new_state;
status.dwControlsAccepted = new_state != SERVICE_RUNNING ?
0 :
SERVICE_ACCEPT_PRESHUTDOWN | SERVICE_ACCEPT_SHUTDOWN | SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_PARAMCHANGE;
status.dwWin32ExitCode = service_specific_exit_code == 0 ? win32_exit_code : ERROR_SERVICE_SPECIFIC_ERROR;
status.dwServiceSpecificExitCode = service_specific_exit_code;
status.dwCheckPoint = check_point;
status.dwWaitHint = wait_hint;
if (SetServiceStatus(status_handle, &status))
{
current_state = new_state;
}
else
{
log_system_error(TR_LOG_DEBUG, GetLastError(), "SetServiceStatus() failed");
}
}
static unsigned int __stdcall service_stop_thread_main(void* param)
{
daemon->stop();
DWORD const sleep_time = 500;
DWORD wait_time = (DWORD)(UINT_PTR)param;
for (DWORD checkpoint = 2; WaitForSingleObject(service_thread, sleep_time) == WAIT_TIMEOUT; ++checkpoint)
{
wait_time = wait_time >= sleep_time ? wait_time - sleep_time : 0;
update_service_status(SERVICE_STOP_PENDING, NO_ERROR, 0, checkpoint, std::max(wait_time, sleep_time * 2));
}
return 0;
}
static void stop_service(void)
{
if (service_stop_thread != nullptr)
{
return;
}
DWORD const wait_time = 30 * 1000;
update_service_status(SERVICE_STOP_PENDING, NO_ERROR, 0, 1, wait_time);
service_stop_thread = (HANDLE)
_beginthreadex(nullptr, 0, &service_stop_thread_main, (LPVOID)(UINT_PTR)wait_time, 0, nullptr);
if (service_stop_thread == nullptr)
{
log_system_error(TR_LOG_DEBUG, GetLastError(), "_beginthreadex() failed, trying to stop synchronously");
service_stop_thread_main((LPVOID)(UINT_PTR)wait_time);
}
}
static DWORD WINAPI handle_service_ctrl(DWORD control_code, DWORD /*event_type*/, LPVOID /*event_data*/, LPVOID /*context*/)
{
switch (control_code)
{
case SERVICE_CONTROL_PRESHUTDOWN:
case SERVICE_CONTROL_SHUTDOWN:
case SERVICE_CONTROL_STOP:
stop_service();
return NO_ERROR;
case SERVICE_CONTROL_PARAMCHANGE:
daemon->reconfigure();
return NO_ERROR;
case SERVICE_CONTROL_INTERROGATE:
update_service_status(current_state, NO_ERROR, 0, 0, 0);
return NO_ERROR;
}
return ERROR_CALL_NOT_IMPLEMENTED;
}
static unsigned int __stdcall service_thread_main(void* /*context*/)
{
return daemon->start(false);
}
static VOID WINAPI service_main(DWORD /*argc*/, LPWSTR* /*argv*/)
{
status_handle = RegisterServiceCtrlHandlerExW(service_name, &handle_service_ctrl, nullptr);
if (status_handle == nullptr)
{
log_system_error(TR_LOG_ERROR, GetLastError(), "RegisterServiceCtrlHandlerEx() failed");
return;
}
update_service_status(SERVICE_START_PENDING, NO_ERROR, 0, 1, 1000);
service_thread = (HANDLE)_beginthreadex(nullptr, 0, &service_thread_main, nullptr, 0, nullptr);
if (service_thread == nullptr)
{
log_system_error(TR_LOG_ERROR, GetLastError(), "_beginthreadex() failed");
return;
}
update_service_status(SERVICE_RUNNING, NO_ERROR, 0, 0, 0);
if (WaitForSingleObject(service_thread, INFINITE) != WAIT_OBJECT_0)
{
log_system_error(TR_LOG_ERROR, GetLastError(), "WaitForSingleObject() failed");
}
if (service_stop_thread != nullptr)
{
WaitForSingleObject(service_stop_thread, INFINITE);
CloseHandle(service_stop_thread);
}
DWORD exit_code;
if (!GetExitCodeThread(service_thread, &exit_code))
{
exit_code = 1;
}
CloseHandle(service_thread);
update_service_status(SERVICE_STOPPED, NO_ERROR, exit_code, 0, 0);
}
bool tr_daemon::setup_signals()
{
return true;
}
bool tr_daemon::spawn(bool foreground, int* exit_code, tr_error** error)
{
daemon = this;
*exit_code = 1;
if (foreground)
{
if (!SetConsoleCtrlHandler(&handle_console_ctrl, TRUE))
{
set_system_error(error, GetLastError(), "SetConsoleCtrlHandler() failed");
return false;
}
*exit_code = start(true);
}
else
{
SERVICE_TABLE_ENTRY const service_table[] = {
{ (LPWSTR)service_name, &service_main },
{ nullptr, nullptr },
};
if (!StartServiceCtrlDispatcherW(service_table))
{
set_system_error(error, GetLastError(), "StartServiceCtrlDispatcher() failed");
return false;
}
*exit_code = 0;
}
return true;
}