ntservice.c

#ifndef CONFIG
#define CONFIG "config.h"
#endif // CONFIG
#include CONFIG

#include "ntservice.h"
#include "shared_globals.h"
#include "vlmcsd.h"
#include "output.h"
#include "helpers.h"

#ifdef _NTSERVICE

SERVICE_STATUS          gSvcStatus;
SERVICE_STATUS_HANDLE   gSvcStatusHandle;

static VOID WINAPI ServiceCtrlHandler(const DWORD dwCtrl)
{
   // Handle the requested control code.

	switch(dwCtrl)
	{
		case SERVICE_CONTROL_STOP:
		case SERVICE_CONTROL_SHUTDOWN:

			ServiceShutdown = TRUE;
			ReportServiceStatus(SERVICE_STOP_PENDING, NO_ERROR, 0);

			// Remove PID file and free ressources
			cleanup();
#			ifdef USE_MSRPC
			ReportServiceStatus(SERVICE_STOPPED, NO_ERROR, 0);
#			endif // !USE_MSRPC
			return;

		/*case SERVICE_CONTROL_INTERROGATE:
			break;*/

		default:
			break;
	}
}

static VOID WINAPI ServiceMain(const int argc_unused, CARGV argv_unused)
{
    // Register the handler function for the service

    gSvcStatusHandle = RegisterServiceCtrlHandler(
                                NT_SERVICE_NAME,
                                ServiceCtrlHandler
                        );

    if(!gSvcStatusHandle)
    {
        //ServiceReportEvent(RegisterServiceCtrlHandler);
        return;
    }

    // These SERVICE_STATUS members remain as set here

    gSvcStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    gSvcStatus.dwServiceSpecificExitCode = 0;

    // Run the actual program
    ReportServiceStatus(SERVICE_STOPPED, newmain(), 3000);
}

SERVICE_TABLE_ENTRY NTServiceDispatchTable[] = {
    {
        (LPSTR)NT_SERVICE_NAME,
        (LPSERVICE_MAIN_FUNCTION) ServiceMain
    },
    {
        NULL,
        NULL
    }
};

VOID ReportServiceStatus(const DWORD dwCurrentState, const DWORD dwWin32ExitCode, const DWORD dwWaitHint)
{
    static DWORD dwCheckPoint = 1;

    // Fill in the SERVICE_STATUS structure.

    gSvcStatus.dwCurrentState = dwCurrentState;
    gSvcStatus.dwWin32ExitCode = dwWin32ExitCode;
    gSvcStatus.dwWaitHint = dwWaitHint;

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

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

    // Report the status of the service to the SCM.
    SetServiceStatus(gSvcStatusHandle, &gSvcStatus);
}

/*VOID ServiceReportEvent(char *szFunction)
{
    HANDLE hEventSource;
    const char *eventStrings[2];
    TCHAR Buffer[80];

    hEventSource = RegisterEventSource(NULL, NT_SERVICE_NAME);

    if (hEventSource)
    {
        snprintf(Buffer, 80, "%s failed with %d", szFunction, GetLastError());

        eventStrings[0] = NT_SERVICE_NAME;
        eventStrings[1] = Buffer;

        ReportEvent(hEventSource,        // event log handle
                    EVENTLOG_ERROR_TYPE, // event type
                    0,                   // event category
                    00,           // event identifier
                    NULL,                // no security identifier
                    2,                   // size of lpszStrings array
                    0,                   // no binary data
                    eventStrings,         // array of strings
                    NULL);               // no binary data

        DeregisterEventSource(hEventSource);
    }
}*/

//Returns 0=Error, 1=Success, 2=Doesn't exist


static uint_fast8_t OpenAndRemoveService(DWORD *dwPreviousState, SC_HANDLE *schSCManager)
{
	SERVICE_STATUS status;
	uint_fast8_t i;
	SC_HANDLE installedService;
	uint_fast8_t result = 1;
	BOOL closeManager = FALSE;

	// Allow NULL for both Arguments
	if (!dwPreviousState) dwPreviousState = (DWORD*)alloca(sizeof(*dwPreviousState));
	if (!schSCManager)
	{
		schSCManager = (SC_HANDLE*)alloca(sizeof(*schSCManager));
		closeManager = TRUE;
	}

    *schSCManager = OpenSCManager(
        NULL,                    // local computer
        NULL,                    // ServicesActive database
        SC_MANAGER_ALL_ACCESS);  // full access rights

    if (!*schSCManager) return 0;

	if (!(installedService = OpenService(*schSCManager, NT_SERVICE_NAME, SERVICE_ALL_ACCESS)))
	{
		result = 2;
	}
	else
	{
		*dwPreviousState = SERVICE_STOPPED;
		if (QueryServiceStatus(installedService, &status)) *dwPreviousState = status.dwCurrentState;

		ControlService(installedService, SERVICE_CONTROL_STOP, &status);

		for (i = 0; i < 10; i++)
		{
			QueryServiceStatus(installedService, &status);
			// Give it 100 ms after it reported SERVICE_STOPPED. Subsequent CreateService will fail otherwise
			Sleep(100);
			if (status.dwCurrentState == SERVICE_STOPPED) break;
		}

		if (!DeleteService(installedService)) result = 0;
		CloseServiceHandle(installedService);
	}

	if (closeManager) CloseServiceHandle(*schSCManager);
	return result;
}

static VOID ServiceInstaller(const char *restrict ServiceUser, const char *const ServicePassword)
{
    SC_HANDLE schSCManager;
    SC_HANDLE schService;
    char szPath[MAX_PATH] = "\"";

    if (!GetModuleFileName(NULL, szPath + sizeof(char), MAX_PATH - 1))
    {
        errorout("Cannot install service (%d)\n", (uint32_t)GetLastError());
        return;
    }

    strcat(szPath,"\"");

    int i;
    for (i = 1; i < global_argc; i ++)
    {
    	// Strip unneccessary parameters, especially the password
    	if (!strcmp(global_argv[i], "-s")) continue;

    	if (!strcmp(global_argv[i], "-W") ||
    		!strcmp(global_argv[i], "-U"))
    	{
    		i++;
    		continue;
    	}

    	strcat(szPath, " ");

    	if (strchr(global_argv[i], ' '))
    	{
    		strcat(szPath, "\"");
    		strcat(szPath, global_argv[i]);
    		strcat(szPath, "\"");
    	}
    	else
    		strcat(szPath, global_argv[i]);
    }

    // Get a handle to the SCM database.

	SERVICE_STATUS status;
	DWORD dwPreviousState;

    if (!OpenAndRemoveService(&dwPreviousState, &schSCManager))
    {
    	errorout("Service removal failed (%d)\n", (uint32_t)GetLastError());
        return;
    }

	char *tempUser = NULL;

	if (ServiceUser)
    {
	    // Shortcuts for some well known users
    	if (!strcasecmp(ServiceUser, "/l")) ServiceUser="NT AUTHORITY\\LocalService";
    	if (!strcasecmp(ServiceUser, "/n")) ServiceUser="NT AUTHORITY\\NetworkService";

    	// Allow Local Users without .\ , e.g. "johndoe" instead of ".\johndoe"
    	if (!strchr(ServiceUser, '\\'))
    	{
    		tempUser = (char*)vlmcsd_malloc(strlen(ServiceUser) + 3);
   			strcpy(tempUser, ".\\");
   			strcat(tempUser, ServiceUser);
   			ServiceUser = tempUser;
    	}
    }

	schService = CreateService(
        schSCManager,				// SCM database
        NT_SERVICE_NAME,			// name of service
        NT_SERVICE_DISPLAY_NAME,	// service name to display
        SERVICE_ALL_ACCESS,			// desired access
        SERVICE_WIN32_OWN_PROCESS,	// service type
        SERVICE_AUTO_START,			// start type
        SERVICE_ERROR_NORMAL,		// error control type
        szPath,						// path to service's binary
        NULL,						// no load ordering group
        NULL,						// no tag identifier
        "tcpip\0",			        // depends on TCP/IP
        ServiceUser,				// LocalSystem account
        ServicePassword);			// no password

#	if __clang__ && (__CYGWIN__ || __MINGW64__ )
	// Workaround for clang not understanding some GCC asm syntax used in <w32api/psdk_inc/intrin-impl.h>
	ZeroMemory((char*)ServicePassword, strlen(ServicePassword));
#	else
	SecureZeroMemory((char*)ServicePassword, strlen(ServicePassword));
#	endif
	if (tempUser) free(tempUser);

    if (schService == NULL)
    {
    	errorout("CreateService failed (%u)\n", (uint32_t)GetLastError());
        CloseServiceHandle(schSCManager);
        return;
    }
    else
    {
    	errorout("Service installed successfully\n");

        if (dwPreviousState == SERVICE_RUNNING)
        {
        	printf("Restarting " NT_SERVICE_NAME " service => ");
        	status.dwCurrentState = SERVICE_STOPPED;

        	if (StartService(schService, 0, NULL))
        	{
            	for (i = 0; i < 10; i++)
            	{
            		if (!QueryServiceStatus(schService, &status) || status.dwCurrentState != SERVICE_START_PENDING) break;
            		Sleep(100);
                }

            	if (status.dwCurrentState == SERVICE_RUNNING)
            		printf("Success\n");
            	else if (status.dwCurrentState == SERVICE_START_PENDING)
            		printf("Not ready within a second\n");
            	else
            		errorout("Error\n");
        	}
        	else
        		errorout("Error %u\n", (uint32_t)GetLastError());
        }
    }

    CloseServiceHandle(schService);
    CloseServiceHandle(schSCManager);
}

int NtServiceInstallation(const int_fast8_t installService, const char *restrict ServiceUser, const char *const ServicePassword)
{
	if (IsNTService) return 0;

	if (installService == 1) // Install
	{
		ServiceInstaller(ServiceUser, ServicePassword);
		return(0);
	}

	if (installService == 2) // Remove
	{
		switch(OpenAndRemoveService(NULL, NULL))
		{
		case 0:
			errorout("Error removing service %s\n", NT_SERVICE_NAME);
			return(!0);
		case 1:
			printf("Service %s removed successfully\n", NT_SERVICE_NAME);
			return(0);
		default:
			errorout("Service %s does not exist.\n", NT_SERVICE_NAME);
			return(!0);
		}
	}

	// Do nothing

	return(0);
}
#endif // _NTSERVICE