service.c

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// 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) 1993-1996  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(int argc, char **argv);
//    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"
#include "main.h"

extern BOOL g_bRestart ;
extern int	g_SysArgc ;
extern char	**g_SysArgv ;


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

TCHAR					szPath[1024 + 1];
TCHAR					szName[1024 + 1];
TCHAR					szDispName[1024 + 1];



// internal function prototypes
VOID WINAPI service_ctrl(DWORD dwCtrlCode);
VOID WINAPI service_main(DWORD dwArgc, LPTSTR *lpszArgv);
VOID CmdInstallService(int argc, char **argv);
VOID CmdRemoveService();
VOID CmdDebugService(int argc, char **argv);
VOID CmdConsoleService(int argc, char **argv);

BOOL WINAPI ControlHandler ( DWORD dwCtrlType );
LPTSTR GetLastErrorText( LPTSTR lpszBuf, DWORD dwSize );

//
//  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)
{
	int	i, j, nlen, dnlen;

    SERVICE_TABLE_ENTRY dispatchTable[] =
    {
        { szName, (LPSERVICE_MAIN_FUNCTION)service_main },
        { NULL, NULL }
    };

	g_SysArgc=argc;
	g_SysArgv=argv;

	memset( szName, '\0', 1024 + 1);
	memset( szDispName, '\0', 1024 + 1);
	memset( szPath, '\0', 1024 + 1);
	sprintf( szName, SZSERVICENAME);
	sprintf( szDispName, SZSERVICEDISPLAYNAME);

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

	if( argc>2)
	{
		for( i=2;i<argc;i++)
		{
			if( !strcmpi(argv[i], "-n"))
			{
				if(argc>i+1){
					j=0;
					i++;
					nlen=strlen(szName);
					dnlen=strlen(szDispName);
					szName[nlen++]=(TCHAR)('_');
					szDispName[dnlen++]=(TCHAR)('_');

					while( argv[i][j]){
						if(( argv[i][j]>='a' && argv[i][j]<='z') ||
						   ( argv[i][j]>='A' && argv[i][j]<='Z')
							){
							szName[nlen++]=(TCHAR)( argv[i][j] | 0x20);
							szDispName[dnlen++]=(TCHAR)( argv[i][j] & 0xDF);
							}
						else{
							szName[nlen++]=(TCHAR)( argv[i][j]);
							szDispName[dnlen++]=(TCHAR)( argv[i][j]);
						}
						j++;
					}
				}
			}
			else
			{
				if( strlen(szPath) + strlen(argv[i]) >=1024) continue;
				strcat(szPath, " ");
				strcat(szPath, argv[i]);
			}
		}
	}

    if ( (argc > 1) &&
         ((*argv[1] == '-') || (*argv[1] == '/')) )
    {
        if ( _stricmp( "install", argv[1]+1 ) == 0 )
        {
            CmdInstallService(argc, argv);
        }
        else if ( _stricmp( "remove", argv[1]+1 ) == 0 )
        {
            CmdRemoveService(argc, argv);
        }
        else if ( _stricmp( "debug", argv[1]+1 ) == 0 )
        {
            bDebug = TRUE;
			printf("Debug %s\n",szDispName);
            CmdDebugService(argc, argv);
        }
        else if ( _stricmp( "console", argv[1]+1 ) == 0 )
        {
            bDebug = TRUE;
            CmdConsoleService(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 [path] [-n [name]] to install the service\n", SZAPPNAME );
        printf( "%s -remove  [path] [-n [name]] to remove  the service\n", SZAPPNAME );
        printf( "%s -debug <params>   to run as a console app for debugging\n", SZAPPNAME );
        printf( "%s -console <params> to run as a console app  \n", SZAPPNAME );
        printf( "This may take several seconds.  Please wait.\n" );

        if (!StartServiceCtrlDispatcher(dispatchTable))
            AddToMessageLog(TEXT("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( szName, 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.
        //
        // SERVICE_STOP_PENDING should be reported before
        // setting the Stop Event - hServerStopEvent - in
        // ServiceStop().  This avoids a race condition
        // which may result in a 1053 - The Service did not respond...
        // error.
        case SERVICE_CONTROL_STOP:
            ReportStatusToSCMgr(SERVICE_STOP_PENDING, NO_ERROR, 0);
            ServiceStop();
            return;

        // 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 ( !bDebug ) // 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))) {
            AddToMessageLog(TEXT("SetServiceStatus"));
        }
    }
    return fResult;
}



//
//  FUNCTION: AddToMessageLog(LPTSTR lpszMsg)
//
//  PURPOSE: Allows any thread to log an error message
//
//  PARAMETERS:
//    lpszMsg - text for message
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//
VOID AddToMessageLog(LPTSTR lpszMsg)
{
    TCHAR   szMsg[256];
    HANDLE  hEventSource;
    LPTSTR  lpszStrings[2];


    if ( !bDebug )
    {
        dwErr = GetLastError();

        // Use event logging to log the error.
        //
        hEventSource = RegisterEventSource(NULL, szName);

        _stprintf(szMsg, TEXT("%s error: %d"), szName, dwErr);
        lpszStrings[0] = szMsg;
        lpszStrings[1] = lpszMsg;

        if (hEventSource != NULL) {
            ReportEvent(hEventSource, // handle of event source
                EVENTLOG_ERROR_TYPE,  // event type
                0,                    // event category
                0,                    // event ID
                NULL,                 // current user's SID
                2,                    // strings in lpszStrings
                0,                    // no bytes of raw data
                lpszStrings,          // array of error strings
                NULL);                // no raw data

            (VOID) DeregisterEventSource(hEventSource);
        }