Service Executable Template Code

#include <windows.h>
#include <stdio.h>
#include <winsvc.h>

#define SERVICE_NAME L"" // service name

SERVICE_STATUS ServiceStatus;
SERVICE_STATUS_HANDLE hStatus;
HANDLE hStopEvent = NULL;

// debug purposes
int LogWrite(LPCWSTR data)
{
    HANDLE hFile = CreateFileW(
        L"",                    // path
        FILE_APPEND_DATA,
        0,
        NULL,
        OPEN_ALWAYS,
        FILE_ATTRIBUTE_NORMAL,
        NULL
    );

    if (hFile == INVALID_HANDLE_VALUE)
    {
        return 1;
    }

    DWORD written;
    WriteFile(hFile, data, wcslen(data) * sizeof(WCHAR), &written, NULL);
    CloseHandle(hFile);

    return 0;
}

VOID ChangeServiceStatus(DWORD dwCurrentState, DWORD dwWin32ExitCode, DWORD dwWaitHint)
{
    /*
        DWORD   dwServiceType;
        DWORD   dwCurrentState;
        DWORD   dwControlsAccepted;
        DWORD   dwWin32ExitCode;
        DWORD   dwServiceSpecificExitCode;
        DWORD   dwCheckPoint;
        DWORD   dwWaitHint;
    */

    static DWORD dwCheckPoint = 1;
    ServiceStatus.dwCurrentState = dwCurrentState;
    ServiceStatus.dwWin32ExitCode = dwWin32ExitCode;
    ServiceStatus.dwWaitHint = dwWaitHint;

    if (dwCurrentState == SERVICE_START_PENDING)
        ServiceStatus.dwControlsAccepted = 0;
    else ServiceStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;

    if ((dwCurrentState == SERVICE_RUNNING) ||
        (dwCurrentState == SERVICE_STOPPED))
        ServiceStatus.dwCheckPoint = 0;
    else ServiceStatus.dwCheckPoint = dwCheckPoint++;

    SetServiceStatus(hStatus, &ServiceStatus);
    LogWrite(L"[*] Service status change\n");
}

void WINAPI ServiceCtrlHandler(DWORD ctrlCode) {
    LogWrite(L"[*] In ServiceCtrlHandler\n");
    switch (ctrlCode)
    {
        case SERVICE_CONTROL_STOP:
            ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;
            ChangeServiceStatus(ServiceStatus.dwCurrentState, NO_ERROR, 3000);

            LogWrite(L"[!] Service stopped by control request\n");
            ServiceStatus.dwCurrentState = SERVICE_STOPPED;
            ChangeServiceStatus(ServiceStatus.dwCurrentState, NO_ERROR, 0);
            break;

        default:
            break;
    }
}

int WINAPI InitService(DWORD argc, LPTSTR* argv)
{
    hStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);

    if (hStopEvent == NULL)
    {
        ChangeServiceStatus(SERVICE_STOPPED, GetLastError(), 0);
        return 1;
    }

    // Report running status when initialization is complete.
    ChangeServiceStatus(SERVICE_RUNNING, NO_ERROR, 0);
    
    // custom functionality


    while (1)
    {
        WaitForSingleObject(hStopEvent, INFINITE);
        ChangeServiceStatus(SERVICE_STOPPED, NO_ERROR, 0);
        return 0;
    }
    
    return 0;
}

int WINAPI ServiceMain(DWORD argc, LPWSTR* argv)
{
    // debug
    LogWrite(L"[+] In ServiceMain\n");

    hStatus = RegisterServiceCtrlHandler(SERVICE_NAME, ServiceCtrlHandler);
    if (hStatus == NULL)
    {
        ServiceStatus.dwCurrentState = SERVICE_STOPPED;
        ChangeServiceStatus(ServiceStatus.dwCurrentState, NO_ERROR, 0);
        LogWrite(L"[-] RegisterServiceCtrlHandler failed\n");
        return 1;
    }

    ServiceStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    ServiceStatus.dwServiceSpecificExitCode = NO_ERROR;

    LogWrite(L"[*] Service is starting...\n");
    ServiceStatus.dwCurrentState = SERVICE_START_PENDING;
    ChangeServiceStatus(ServiceStatus.dwCurrentState, NO_ERROR, 3000);

    InitService(argc, argv);
}

// main runs regardless of service structures
int main(int argc, CHAR* argv[])
{
    SERVICE_TABLE_ENTRYW ServiceTable[] = {
        (LPWSTR)SERVICE_NAME,
        (LPSERVICE_MAIN_FUNCTION)ServiceMain
    };

    if (!StartServiceCtrlDispatcher(ServiceTable)) {
        LogWrite(L"[-] StartServiceCtrlDispatcher failed\n");
    }

	return 0;
}