// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (C) 1993-1995  Microsoft Corporation.  All Rights Reserved.
//
//  MODULE:   service.c
//
//  PURPOSE:  Implements functions required by all services
//            windows.
//
//  FUNCTIONS:
//    main(int argc, char **argv);
//    service_ctrl(DWORD dwCtrlCode);
//    service_main(DWORD dwArgc, LPTSTR *lpszArgv);
//    CmdInstallService();
//    CmdRemoveService();
//    CmdDebugService(int argc, char **argv);
//    ControlHandler ( DWORD dwCtrlType );
//    GetLastErrorText( LPTSTR lpszBuf, DWORD dwSize );
//
//  COMMENTS:
//
//  AUTHOR: Craig Link - Microsoft Developer Support
//


#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <process.h>
#include <tchar.h>

#include "service.h"



// internal variables
SERVICE_STATUS          ssStatus;       // current status of the service
SERVICE_STATUS_HANDLE   sshStatusHandle;
DWORD                   dwErr = 0;
BOOL                    bSvcDebug = FALSE;
TCHAR                   szErr[256];

// internal function prototypes
VOID WINAPI service_ctrl(DWORD dwCtrlCode);
VOID WINAPI service_main(DWORD dwArgc, LPTSTR *lpszArgv);
VOID CmdInstallService();
VOID CmdRemoveService();
VOID CmdDebugService(int argc, char **argv);
BOOL WINAPI ControlHandler ( DWORD dwCtrlType );
LPTSTR GetLastErrorText( LPTSTR lpszBuf, DWORD dwSize );
int AddEventSource(char *ident);


//
//  FUNCTION: main
//
//  PURPOSE: entrypoint for service
//
//  PARAMETERS:
//    argc - number of command line arguments
//    argv - array of command line arguments
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//    main() either performs the command line task, or
//    call StartServiceCtrlDispatcher to register the
//    main service thread.  When the this call returns,
//    the service has stopped, so exit.
//
void main(int argc, char **argv)
{
    SERVICE_TABLE_ENTRY dispatchTable[] =
    {
        { TEXT(SZSERVICENAME), (LPSERVICE_MAIN_FUNCTION)service_main },
        { NULL, NULL }
    };

    if ( (argc > 1) &&
         ((*argv[1] == '-') || (*argv[1] == '/')) )
    {
        if ( _stricmp( "install", argv[1]+1 ) == 0 )
        {
            CmdInstallService();
        }
        else if ( _stricmp( "remove", argv[1]+1 ) == 0 )
        {
            CmdRemoveService();
        }
        else if ( _stricmp( "debug", argv[1]+1 ) == 0 )
        {
            bSvcDebug = TRUE;
			AddEventSource(SZSERVICENAME);
            CmdDebugService(argc, argv);
        }
        else
        {
            goto dispatch;
        }
        exit(0);
    }

    // if it doesn't match any of the above parameters
    // the service control manager may be starting the service
    // so we must call StartServiceCtrlDispatcher
    dispatch:
        // this is just to be friendly
        printf( "%s -install          to install the service\n", SZAPPNAME );
        printf( "%s -remove           to remove the service\n", SZAPPNAME );
        printf( "%s -debug <params>   to run as a console app for debugging\n", SZAPPNAME );
        printf( "\nStartServiceCtrlDispatcher being called.\n" );
        printf( "This may take several seconds.  Please wait.\n" );

		AddEventSource(SZSERVICENAME);
        if (!StartServiceCtrlDispatcher(dispatchTable))
	    	LogEvent(NULL, EVENTLOG_ERROR_TYPE, EVID_SVCFAIL, NULL, "StartServiceCtrlDispatcher failed.");
}

//
//  FUNCTION: service_main
//
//  PURPOSE: To perform actual initialization of the service
//
//  PARAMETERS:
//    dwArgc   - number of command line arguments
//    lpszArgv - array of command line arguments
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//    This routine performs the service initialization and then calls
//    the user defined ServiceStart() routine to perform majority
//    of the work.
//
void WINAPI service_main(DWORD dwArgc, LPTSTR *lpszArgv)
{

    // register our service control handler:
    //
    sshStatusHandle = RegisterServiceCtrlHandler( TEXT(SZSERVICENAME), service_ctrl);

    if (!sshStatusHandle)
        goto cleanup;

    // SERVICE_STATUS members that don't change in example
    //
    ssStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    ssStatus.dwServiceSpecificExitCode = 0;


    // report the status to the service control manager.
    //
    if (!ReportStatusToSCMgr(
        SERVICE_START_PENDING, // service state
        NO_ERROR,              // exit code
        3000))                 // wait hint
        goto cleanup;


    ServiceStart( dwArgc, lpszArgv );

cleanup:

    // try to report the stopped status to the service control manager.
    //
    if (sshStatusHandle)
        (VOID)ReportStatusToSCMgr(
                            SERVICE_STOPPED,
                            dwErr,
                            0);

    return;
}



//
//  FUNCTION: service_ctrl
//
//  PURPOSE: This function is called by the SCM whenever
//           ControlService() is called on this service.
//
//  PARAMETERS:
//    dwCtrlCode - type of control requested
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//
VOID WINAPI service_ctrl(DWORD dwCtrlCode)
{
    // Handle the requested control code.
    //
    switch(dwCtrlCode)
    {
        // Stop the service.
        //
        case SERVICE_CONTROL_STOP:
            ssStatus.dwCurrentState = SERVICE_STOP_PENDING;
            ServiceStop();
            break;

        // Update the service status.
        //
        case SERVICE_CONTROL_INTERROGATE:
            break;

        // invalid control code
        //
        default:
            break;

    }

    ReportStatusToSCMgr(ssStatus.dwCurrentState, NO_ERROR, 0);
}



//
//  FUNCTION: ReportStatusToSCMgr()
//
//  PURPOSE: Sets the current status of the service and
//           reports it to the Service Control Manager
//
//  PARAMETERS:
//    dwCurrentState - the state of the service
//    dwWin32ExitCode - error code to report
//    dwWaitHint - worst case estimate to next checkpoint
//
//  RETURN VALUE:
//    TRUE  - success
//    FALSE - failure
//
//  COMMENTS:
//
BOOL ReportStatusToSCMgr(DWORD dwCurrentState, DWORD dwWin32ExitCode, DWORD dwWaitHint)
{
    static DWORD dwCheckPoint = 1;
    BOOL fResult = TRUE;

    if ( !bSvcDebug ) // when debugging we don't report to the SCM
    {
        if (dwCurrentState == SERVICE_START_PENDING)
            ssStatus.dwControlsAccepted = 0;
        else
            ssStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;

        ssStatus.dwCurrentState = dwCurrentState;
        ssStatus.dwWin32ExitCode = dwWin32ExitCode;
        ssStatus.dwWaitHint = dwWaitHint;

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


        // Report the status of the service to the service control manager.
        //
        if (!(fResult = SetServiceStatus( sshStatusHandle, &ssStatus)))
	    LogEvent(NULL, EVENTLOG_ERROR_TYPE, EVID_SSSFAIL, NULL, "SetServiceStatus failed.");
    }
    return fResult;
}


/* Taken from MSDN. - registers event message file */
int AddEventSource(char *ident)
{
    HKEY hk; 
    DWORD dwData; 
    char szFilePath[_MAX_PATH];
	char key[_MAX_PATH];
	
    // Add your source name as a subkey under the Application 
    // key in the EventLog registry key. 
    _snprintf(key, sizeof(key), "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\%s", ident);
    if (RegCreateKey(HKEY_LOCAL_MACHINE, key, &hk)) {
		// Could not create the registry key.
		return( 1);
	}
 
    // Set the name of the message file. 
	GetModuleFileName(NULL, szFilePath, sizeof(szFilePath));
    // Add the name to the EventMessageFile subkey. 
 
    if (RegSetValueEx(hk,             // subkey handle 
            "EventMessageFile",       // value name 
            0,                        // must be zero 
            REG_EXPAND_SZ,            // value type 
            (LPBYTE) szFilePath,           // pointer to value data 
            strlen(szFilePath) + 1)) {       // length of value data 
        // Could not set the event message file.
		return( 2);
	}
 
    // Set the supported event types in the TypesSupported subkey. 
     dwData = EVENTLOG_ERROR_TYPE | EVENTLOG_WARNING_TYPE | 
        EVENTLOG_INFORMATION_TYPE | EVENTLOG_AUDIT_SUCCESS | EVENTLOG_AUDIT_FAILURE; 
 
    if (RegSetValueEx(hk,      // subkey handle 
            "TypesSupported",  // value name 
            0,                 // must be zero 
            REG_DWORD,         // value type 
            (LPBYTE) &dwData,  // pointer to value data 
            sizeof(DWORD))){    // length of value data 
        // Could not set the supported types.
		return( 3);
	}
 
    RegCloseKey(hk); 
    return( 0);
} 

/****************************************************************************
*
*	 FUNCTION: LogEvent(server, type, id, userSID, message)
*
*	 VALID TYPES ARE:
*		EVENTLOG_ERROR_TYPE 		Error event
*		EVENTLOG_WARNING_TYPE		Warning event
*		EVENTLOG_INFORMATION_TYPE	Information event
*
*\***************************************************************************/
BOOL LogEvent(LPCTSTR lpUNCServerName, WORD wType, DWORD dwEventID, PSID lpUserSid,	LPCTSTR message)
{
	HANDLE hElog;
	BOOL res;
	LPCTSTR  messages[] = {message, NULL};

	// hElog = RegisterEventSource(lpUNCServerName, SZSERVICEDISPLAYNAME);
	hElog = RegisterEventSource(lpUNCServerName, SZSERVICENAME);
	res = ReportEvent(hElog, wType, 0, dwEventID, lpUserSid, 1, 0, messages, NULL);
	return (DeregisterEventSource(hElog) && res);
}

void AddToMessageLog(LPTSTR lpszMsg)
{
	LogEvent(NULL, EVENTLOG_INFORMATION_TYPE, EVID_GENERIC, NULL, lpszMsg);
}

///////////////////////////////////////////////////////////////////
//
//  The following code handles service installation and removal
//
//
//  FUNCTION: CmdInstallService()
//
//  PURPOSE: Installs the service
//
//  PARAMETERS:
//    none
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//
void CmdInstallService()
{
    SC_HANDLE   schService;
    SC_HANDLE   schSCManager;

    TCHAR szPath[512];

    if ( GetModuleFileName( NULL, szPath, 512 ) == 0 )
    {
        _tprintf(TEXT("Unable to install %s - %s\n"), TEXT(SZSERVICEDISPLAYNAME), GetLastErrorText(szErr, 256));
        return;
    }

    schSCManager = OpenSCManager(
                        NULL,                   // machine (NULL == local)
                        NULL,                   // database (NULL == default)
                        SC_MANAGER_ALL_ACCESS   // access required
                        );
    
    
    if ( schSCManager )
    {
        schService = CreateService(
            schSCManager,               // SCManager database
            TEXT(SZSERVICENAME),        // name of service
            TEXT(SZSERVICEDISPLAYNAME), // 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,                     // service's binary
            NULL,                       // no load ordering group
            NULL,                       // no tag identifier
            TEXT(SZDEPENDENCIES),       // dependencies
            NULL,                       // LocalSystem account
            NULL);                      // no password

        if ( schService )
        {
            _tprintf(TEXT("%s installed.\n"), TEXT(SZSERVICEDISPLAYNAME) );
            CloseServiceHandle(schService);
        }
        else
        {
            _tprintf(TEXT("CreateService failed - %s\n"), GetLastErrorText(szErr, 256));
        }

        CloseServiceHandle(schSCManager);
    }
    else
        _tprintf(TEXT("OpenSCManager failed - %s\n"), GetLastErrorText(szErr,256));
}

//
//  FUNCTION: CmdRemoveService()
//
//  PURPOSE: Stops and removes the service
//
//  PARAMETERS:
//    none
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//
void CmdRemoveService()
{
    SC_HANDLE   schService;
    SC_HANDLE   schSCManager;

    schSCManager = OpenSCManager(
                        NULL,                   // machine (NULL == local)
                        NULL,                   // database (NULL == default)
                        SC_MANAGER_ALL_ACCESS   // access required
                        );
    if ( schSCManager )
    {
        schService = OpenService(schSCManager, TEXT(SZSERVICENAME), SERVICE_ALL_ACCESS);
        if (schService)
        {
            // try to stop the service
            if ( ControlService( schService, SERVICE_CONTROL_STOP, &ssStatus ) )
            {
                _tprintf(TEXT("Stopping %s."), TEXT(SZSERVICEDISPLAYNAME));
                Sleep( 1000 );
                while( QueryServiceStatus( schService, &ssStatus ) )
                {
                    if ( ssStatus.dwCurrentState == SERVICE_STOP_PENDING )
                    {
                        _tprintf(TEXT("."));
                        Sleep( 1000 );
                    }
                    else
                        break;
                }

                if ( ssStatus.dwCurrentState == SERVICE_STOPPED )
                    _tprintf(TEXT("\n%s stopped.\n"), TEXT(SZSERVICEDISPLAYNAME) );
                else
                    _tprintf(TEXT("\n%s failed to stop.\n"), TEXT(SZSERVICEDISPLAYNAME) );

            }

            // now remove the service
            if( DeleteService(schService) )
                _tprintf(TEXT("%s removed.\n"), TEXT(SZSERVICEDISPLAYNAME) );
            else
                _tprintf(TEXT("DeleteService failed - %s\n"), GetLastErrorText(szErr,256));


            CloseServiceHandle(schService);
        }
        else
            _tprintf(TEXT("OpenService failed - %s\n"), GetLastErrorText(szErr,256));

        CloseServiceHandle(schSCManager);
    }
    else
        _tprintf(TEXT("OpenSCManager failed - %s\n"), GetLastErrorText(szErr,256));
}


///////////////////////////////////////////////////////////////////
//
//  The following code is for running the service as a console app
//

//
//  FUNCTION: CmdDebugService(int argc, char ** argv)
//
//  PURPOSE: Runs the service as a console application
//
//  PARAMETERS:
//    argc - number of command line arguments
//    argv - array of command line arguments
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//
void CmdDebugService(int argc, char ** argv)
{
    DWORD dwArgc;
    LPTSTR *lpszArgv;

#ifdef UNICODE
    lpszArgv = CommandLineToArgvW(GetCommandLineW(), &(dwArgc) );
#else
    dwArgc   = (DWORD) argc;
    lpszArgv = argv;
#endif

    _tprintf(TEXT("Debugging %s.\n"), TEXT(SZSERVICEDISPLAYNAME));
    SetConsoleCtrlHandler( ControlHandler, TRUE );
    ServiceStart( dwArgc, lpszArgv );
}


//
//  FUNCTION: ControlHandler ( DWORD dwCtrlType )
//
//  PURPOSE: Handled console control events
//
//  PARAMETERS:
//    dwCtrlType - type of control event
//
//  RETURN VALUE:
//    True - handled
//    False - unhandled
//
//  COMMENTS:
//
BOOL WINAPI ControlHandler ( DWORD dwCtrlType )
{
    switch( dwCtrlType )
    {
        case CTRL_BREAK_EVENT:  // use Ctrl+C or Ctrl+Break to simulate
        case CTRL_C_EVENT:      // SERVICE_CONTROL_STOP in debug mode
            _tprintf(TEXT("Stopping %s.\n"), TEXT(SZSERVICEDISPLAYNAME));
            ServiceStop();
            return TRUE;
            break;

    }
    return FALSE;
}

//
//  FUNCTION: GetLastErrorText
//
//  PURPOSE: copies error message text to string
//
//  PARAMETERS:
//    lpszBuf - destination buffer
//    dwSize - size of buffer
//
//  RETURN VALUE:
//    destination buffer
//
//  COMMENTS:
//
LPTSTR GetLastErrorText( LPTSTR lpszBuf, DWORD dwSize )
{
    DWORD dwRet;
    LPTSTR lpszTemp = NULL;

    dwRet = FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |FORMAT_MESSAGE_ARGUMENT_ARRAY,
                           NULL,
                           GetLastError(),
                           LANG_NEUTRAL,
                           (LPTSTR)&lpszTemp,
                           0,
                           NULL );

    // supplied buffer is not long enough
    if ( !dwRet || ( (long)dwSize < (long)dwRet+14 ) )
        lpszBuf[0] = TEXT('\0');
    else
    {
        lpszTemp[lstrlen(lpszTemp)-2] = TEXT('\0');  //remove cr and newline character
        _stprintf( lpszBuf, TEXT("%s (0x%x)"), lpszTemp, GetLastError() );
    }

    if ( lpszTemp )
        LocalFree((HLOCAL) lpszTemp );

    return lpszBuf;
}

/*
  For Gnu Emacs.
  Local Variables:
  tab-width: 4
  c-basic-offset: 4
  End:
*/
