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SvcControl.cpp

The following is a sample service control program.

When building the sample, be sure to link with Kernel32.lib and Advapi32.lib.


#include <windows.h>
#include <tchar.h>
#include <strsafe.h>
#include <aclapi.h>
#include <stdio.h>

#pragma comment(lib, "advapi32.lib")

TCHAR szCommand[10];
TCHAR szSvcName[80];

SC_HANDLE schSCManager;
SC_HANDLE schService;

VOID __stdcall DisplayUsage(void);

VOID __stdcall DoStartSvc(void);
VOID __stdcall DoUpdateSvcDacl(void);
VOID __stdcall DoStopSvc(void);

BOOL __stdcall StopDependentServices(void);

//
// Purpose: 
//   Entry point function. Executes specified command from user.
//
// Parameters:
//   Command-line syntax is: svccontrol [command] [service_name]
// 
// Return value:
//   None
//
void _tmain(int argc, TCHAR *argv[])
{
    printf("\n");
    if( argc != 3 )
    {
        printf("ERROR: Incorrect number of arguments\n\n");
        DisplayUsage();
        return;
    }

    StringCchCopy(szCommand, 10, argv[1]);
    StringCchCopy(szSvcName, 80, argv[2]);

    if (lstrcmpi( szCommand, TEXT("start")) == 0 )
        DoStartSvc();
    else if (lstrcmpi( szCommand, TEXT("dacl")) == 0 )
        DoUpdateSvcDacl();
    else if (lstrcmpi( szCommand, TEXT("stop")) == 0 )
        DoStopSvc();
    else 
    {
        _tprintf(TEXT("Unknown command (%s)\n\n"), szCommand);
        DisplayUsage();
    }
}

VOID __stdcall DisplayUsage()
{
    printf("Description:\n");
    printf("\tCommand-line tool that controls a service.\n\n");
    printf("Usage:\n");
    printf("\tsvccontrol [command] [service_name]\n\n");
    printf("\t[command]\n");
    printf("\t  start\n");
    printf("\t  dacl\n");
    printf("\t  stop\n");
}

//
// Purpose: 
//   Starts the service if possible.
//
// Parameters:
//   None
// 
// Return value:
//   None
//
VOID __stdcall DoStartSvc()
{
    SERVICE_STATUS_PROCESS ssStatus; 
    DWORD dwOldCheckPoint; 
    DWORD dwStartTickCount;
    DWORD dwWaitTime;
    DWORD dwBytesNeeded;

    // Get a handle to the SCM database. 
 
    schSCManager = OpenSCManager( 
        NULL,                    // local computer
        NULL,                    // servicesActive database 
        SC_MANAGER_ALL_ACCESS);  // full access rights 
 
    if (NULL == schSCManager) 
    {
        printf("OpenSCManager failed (%d)\n", GetLastError());
        return;
    }

    // Get a handle to the service.

    schService = OpenService( 
        schSCManager,         // SCM database 
        szSvcName,            // name of service 
        SERVICE_ALL_ACCESS);  // full access 
 
    if (schService == NULL)
    { 
        printf("OpenService failed (%d)\n", GetLastError()); 
        CloseServiceHandle(schSCManager);
        return;
    }    

    // Check the status in case the service is not stopped. 

    if (!QueryServiceStatusEx( 
            schService,                     // handle to service 
            SC_STATUS_PROCESS_INFO,         // information level
            (LPBYTE) &ssStatus,             // address of structure
            sizeof(SERVICE_STATUS_PROCESS), // size of structure
            &dwBytesNeeded ) )              // size needed if buffer is too small
    {
        printf("QueryServiceStatusEx failed (%d)\n", GetLastError());
        CloseServiceHandle(schService); 
        CloseServiceHandle(schSCManager);
        return; 
    }

    // Check if the service is already running. It would be possible 
    // to stop the service here, but for simplicity this example just returns. 

    if(ssStatus.dwCurrentState != SERVICE_STOPPED && ssStatus.dwCurrentState != SERVICE_STOP_PENDING)
    {
        printf("Cannot start the service because it is already running\n");
        CloseServiceHandle(schService); 
        CloseServiceHandle(schSCManager);
        return; 
    }

    // Save the tick count and initial checkpoint.

    dwStartTickCount = GetTickCount();
    dwOldCheckPoint = ssStatus.dwCheckPoint;

    // Wait for the service to stop before attempting to start it.

    while (ssStatus.dwCurrentState == SERVICE_STOP_PENDING)
    {
        // Do not wait longer than the wait hint. A good interval is 
        // one-tenth of the wait hint but not less than 1 second  
        // and not more than 10 seconds. 
 
        dwWaitTime = ssStatus.dwWaitHint / 10;

        if( dwWaitTime < 1000 )
            dwWaitTime = 1000;
        else if ( dwWaitTime > 10000 )
            dwWaitTime = 10000;

        Sleep( dwWaitTime );

        // Check the status until the service is no longer stop pending. 
 
        if (!QueryServiceStatusEx( 
                schService,                     // handle to service 
                SC_STATUS_PROCESS_INFO,         // information level
                (LPBYTE) &ssStatus,             // address of structure
                sizeof(SERVICE_STATUS_PROCESS), // size of structure
                &dwBytesNeeded ) )              // size needed if buffer is too small
        {
            printf("QueryServiceStatusEx failed (%d)\n", GetLastError());
            CloseServiceHandle(schService); 
            CloseServiceHandle(schSCManager);
            return; 
        }

        if ( ssStatus.dwCheckPoint > dwOldCheckPoint )
        {
            // Continue to wait and check.

            dwStartTickCount = GetTickCount();
            dwOldCheckPoint = ssStatus.dwCheckPoint;
        }
        else
        {
            if(GetTickCount()-dwStartTickCount > ssStatus.dwWaitHint)
            {
                printf("Timeout waiting for service to stop\n");
                CloseServiceHandle(schService); 
                CloseServiceHandle(schSCManager);
                return; 
            }
        }
    }

    // Attempt to start the service.

    if (!StartService(
            schService,  // handle to service 
            0,           // number of arguments 
            NULL) )      // no arguments 
    {
        printf("StartService failed (%d)\n", GetLastError());
        CloseServiceHandle(schService); 
        CloseServiceHandle(schSCManager);
        return; 
    }
    else printf("Service start pending...\n"); 

    // Check the status until the service is no longer start pending. 
 
    if (!QueryServiceStatusEx( 
            schService,                     // handle to service 
            SC_STATUS_PROCESS_INFO,         // info level
            (LPBYTE) &ssStatus,             // address of structure
            sizeof(SERVICE_STATUS_PROCESS), // size of structure
            &dwBytesNeeded ) )              // if buffer too small
    {
        printf("QueryServiceStatusEx failed (%d)\n", GetLastError());
        CloseServiceHandle(schService); 
        CloseServiceHandle(schSCManager);
        return; 
    }
 
    // Save the tick count and initial checkpoint.

    dwStartTickCount = GetTickCount();
    dwOldCheckPoint = ssStatus.dwCheckPoint;

    while (ssStatus.dwCurrentState == SERVICE_START_PENDING) 
    { 
        // Do not wait longer than the wait hint. A good interval is 
        // one-tenth the wait hint, but no less than 1 second and no 
        // more than 10 seconds. 
 
        dwWaitTime = ssStatus.dwWaitHint / 10;

        if( dwWaitTime < 1000 )
            dwWaitTime = 1000;
        else if ( dwWaitTime > 10000 )
            dwWaitTime = 10000;

        Sleep( dwWaitTime );

        // Check the status again. 
 
        if (!QueryServiceStatusEx( 
            schService,             // handle to service 
            SC_STATUS_PROCESS_INFO, // info level
            (LPBYTE) &ssStatus,             // address of structure
            sizeof(SERVICE_STATUS_PROCESS), // size of structure
            &dwBytesNeeded ) )              // if buffer too small
        {
            printf("QueryServiceStatusEx failed (%d)\n", GetLastError());
            break; 
        }
 
        if ( ssStatus.dwCheckPoint > dwOldCheckPoint )
        {
            // Continue to wait and check.

            dwStartTickCount = GetTickCount();
            dwOldCheckPoint = ssStatus.dwCheckPoint;
        }
        else
        {
            if(GetTickCount()-dwStartTickCount > ssStatus.dwWaitHint)
            {
                // No progress made within the wait hint.
                break;
            }
        }
    } 

    // Determine whether the service is running.

    if (ssStatus.dwCurrentState == SERVICE_RUNNING) 
    {
        printf("Service started successfully.\n"); 
    }
    else 
    { 
        printf("Service not started. \n");
        printf("  Current State: %d\n", ssStatus.dwCurrentState); 
        printf("  Exit Code: %d\n", ssStatus.dwWin32ExitCode); 
        printf("  Check Point: %d\n", ssStatus.dwCheckPoint); 
        printf("  Wait Hint: %d\n", ssStatus.dwWaitHint); 
    } 

    CloseServiceHandle(schService); 
    CloseServiceHandle(schSCManager);
}

//
// Purpose: 
//   Updates the service DACL to grant start, stop, delete, and read
//   control access to the Guest account.
//
// Parameters:
//   None
// 
// Return value:
//   None
//
VOID __stdcall DoUpdateSvcDacl()
{
    EXPLICIT_ACCESS      ea;
    SECURITY_DESCRIPTOR  sd;
    PSECURITY_DESCRIPTOR psd            = NULL;
    PACL                 pacl           = NULL;
    PACL                 pNewAcl        = NULL;
    BOOL                 bDaclPresent   = FALSE;
    BOOL                 bDaclDefaulted = FALSE;
    DWORD                dwError        = 0;
    DWORD                dwSize         = 0;
    DWORD                dwBytesNeeded  = 0;

    // Get a handle to the SCM database. 
 
    schSCManager = OpenSCManager( 
        NULL,                    // local computer
        NULL,                    // ServicesActive database 
        SC_MANAGER_ALL_ACCESS);  // full access rights 
 
    if (NULL == schSCManager) 
    {
        printf("OpenSCManager failed (%d)\n", GetLastError());
        return;
    }

    // Get a handle to the service

    schService = OpenService( 
        schSCManager,              // SCManager database 
        szSvcName,                 // name of service 
        READ_CONTROL | WRITE_DAC); // access
 
    if (schService == NULL)
    { 
        printf("OpenService failed (%d)\n", GetLastError()); 
        CloseServiceHandle(schSCManager);
        return;
    }    

    // Get the current security descriptor.

    if (!QueryServiceObjectSecurity(schService,
        DACL_SECURITY_INFORMATION, 
        &psd,           // using NULL does not work on all versions
        0, 
        &dwBytesNeeded))
    {
        if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
        {
            dwSize = dwBytesNeeded;
            psd = (PSECURITY_DESCRIPTOR)HeapAlloc(GetProcessHeap(),
                    HEAP_ZERO_MEMORY, dwSize);
            if (psd == NULL)
            {
                // Note: HeapAlloc does not support GetLastError.
                printf("HeapAlloc failed\n");
                goto dacl_cleanup;
            }
  
            if (!QueryServiceObjectSecurity(schService,
                DACL_SECURITY_INFORMATION, psd, dwSize, &dwBytesNeeded))
            {
                printf("QueryServiceObjectSecurity failed (%d)\n", GetLastError());
                goto dacl_cleanup;
            }
        }
        else 
        {
            printf("QueryServiceObjectSecurity failed (%d)\n", GetLastError());
            goto dacl_cleanup;
        }
    }

    // Get the DACL.

    if (!GetSecurityDescriptorDacl(psd, &bDaclPresent, &pacl,
                                   &bDaclDefaulted))
    {
        printf("GetSecurityDescriptorDacl failed(%d)\n", GetLastError());
        goto dacl_cleanup;
    }

    // Build the ACE.

    BuildExplicitAccessWithName(&ea, TEXT("GUEST"),
        SERVICE_START | SERVICE_STOP | READ_CONTROL | DELETE,
        SET_ACCESS, NO_INHERITANCE);

    dwError = SetEntriesInAcl(1, &ea, pacl, &pNewAcl);
    if (dwError != ERROR_SUCCESS)
    {
        printf("SetEntriesInAcl failed(%d)\n", dwError);
        goto dacl_cleanup;
    }

    // Initialize a new security descriptor.

    if (!InitializeSecurityDescriptor(&sd, 
        SECURITY_DESCRIPTOR_REVISION))
    {
        printf("InitializeSecurityDescriptor failed(%d)\n", GetLastError());
        goto dacl_cleanup;
    }

    // Set the new DACL in the security descriptor.

    if (!SetSecurityDescriptorDacl(&sd, TRUE, pNewAcl, FALSE))
    {
        printf("SetSecurityDescriptorDacl failed(%d)\n", GetLastError());
        goto dacl_cleanup;
    }

    // Set the new DACL for the service object.

    if (!SetServiceObjectSecurity(schService, 
        DACL_SECURITY_INFORMATION, &sd))
    {
        printf("SetServiceObjectSecurity failed(%d)\n", GetLastError());
        goto dacl_cleanup;
    }
    else printf("Service DACL updated successfully\n");

dacl_cleanup:
    CloseServiceHandle(schSCManager);
    CloseServiceHandle(schService);

    if(NULL != pNewAcl)
        LocalFree((HLOCAL)pNewAcl);
    if(NULL != psd)
        HeapFree(GetProcessHeap(), 0, (LPVOID)psd);
}

//
// Purpose: 
//   Stops the service.
//
// Parameters:
//   None
// 
// Return value:
//   None
//
VOID __stdcall DoStopSvc()
{
    SERVICE_STATUS_PROCESS ssp;
    DWORD dwStartTime = GetTickCount();
    DWORD dwBytesNeeded;
    DWORD dwTimeout = 30000; // 30-second time-out
    DWORD dwWaitTime;

    // Get a handle to the SCM database. 
 
    schSCManager = OpenSCManager( 
        NULL,                    // local computer
        NULL,                    // ServicesActive database 
        SC_MANAGER_ALL_ACCESS);  // full access rights 
 
    if (NULL == schSCManager) 
    {
        printf("OpenSCManager failed (%d)\n", GetLastError());
        return;
    }

    // Get a handle to the service.

    schService = OpenService( 
        schSCManager,         // SCM database 
        szSvcName,            // name of service 
        SERVICE_STOP | 
        SERVICE_QUERY_STATUS | 
        SERVICE_ENUMERATE_DEPENDENTS);  
 
    if (schService == NULL)
    { 
        printf("OpenService failed (%d)\n", GetLastError()); 
        CloseServiceHandle(schSCManager);
        return;
    }    

    // Make sure the service is not already stopped.

    if ( !QueryServiceStatusEx( 
            schService, 
            SC_STATUS_PROCESS_INFO,
            (LPBYTE)&ssp, 
            sizeof(SERVICE_STATUS_PROCESS),
            &dwBytesNeeded ) )
    {
        printf("QueryServiceStatusEx failed (%d)\n", GetLastError()); 
        goto stop_cleanup;
    }

    if ( ssp.dwCurrentState == SERVICE_STOPPED )
    {
        printf("Service is already stopped.\n");
        goto stop_cleanup;
    }

    // If a stop is pending, wait for it.

    while ( ssp.dwCurrentState == SERVICE_STOP_PENDING ) 
    {
        printf("Service stop pending...\n");

        // Do not wait longer than the wait hint. A good interval is 
        // one-tenth of the wait hint but not less than 1 second  
        // and not more than 10 seconds. 
 
        dwWaitTime = ssp.dwWaitHint / 10;

        if( dwWaitTime < 1000 )
            dwWaitTime = 1000;
        else if ( dwWaitTime > 10000 )
            dwWaitTime = 10000;

        Sleep( dwWaitTime );

        if ( !QueryServiceStatusEx( 
                 schService, 
                 SC_STATUS_PROCESS_INFO,
                 (LPBYTE)&ssp, 
                 sizeof(SERVICE_STATUS_PROCESS),
                 &dwBytesNeeded ) )
        {
            printf("QueryServiceStatusEx failed (%d)\n", GetLastError()); 
            goto stop_cleanup;
        }

        if ( ssp.dwCurrentState == SERVICE_STOPPED )
        {
            printf("Service stopped successfully.\n");
            goto stop_cleanup;
        }

        if ( GetTickCount() - dwStartTime > dwTimeout )
        {
            printf("Service stop timed out.\n");
            goto stop_cleanup;
        }
    }

    // If the service is running, dependencies must be stopped first.

    StopDependentServices();

    // Send a stop code to the service.

    if ( !ControlService( 
            schService, 
            SERVICE_CONTROL_STOP, 
            (LPSERVICE_STATUS) &ssp ) )
    {
        printf( "ControlService failed (%d)\n", GetLastError() );
        goto stop_cleanup;
    }

    // Wait for the service to stop.

    while ( ssp.dwCurrentState != SERVICE_STOPPED ) 
    {
        Sleep( ssp.dwWaitHint );
        if ( !QueryServiceStatusEx( 
                schService, 
                SC_STATUS_PROCESS_INFO,
                (LPBYTE)&ssp, 
                sizeof(SERVICE_STATUS_PROCESS),
                &dwBytesNeeded ) )
        {
            printf( "QueryServiceStatusEx failed (%d)\n", GetLastError() );
            goto stop_cleanup;
        }

        if ( ssp.dwCurrentState == SERVICE_STOPPED )
            break;

        if ( GetTickCount() - dwStartTime > dwTimeout )
        {
            printf( "Wait timed out\n" );
            goto stop_cleanup;
        }
    }
    printf("Service stopped successfully\n");

stop_cleanup:
    CloseServiceHandle(schService); 
    CloseServiceHandle(schSCManager);
}

BOOL __stdcall StopDependentServices()
{
    DWORD i;
    DWORD dwBytesNeeded;
    DWORD dwCount;

    LPENUM_SERVICE_STATUS   lpDependencies = NULL;
    ENUM_SERVICE_STATUS     ess;
    SC_HANDLE               hDepService;
    SERVICE_STATUS_PROCESS  ssp;

    DWORD dwStartTime = GetTickCount();
    DWORD dwTimeout = 30000; // 30-second time-out

    // Pass a zero-length buffer to get the required buffer size.
    if ( EnumDependentServices( schService, SERVICE_ACTIVE, 
         lpDependencies, 0, &dwBytesNeeded, &dwCount ) ) 
    {
         // If the Enum call succeeds, then there are no dependent
         // services, so do nothing.
         return TRUE;
    } 
    else 
    {
        if ( GetLastError() != ERROR_MORE_DATA )
            return FALSE; // Unexpected error

        // Allocate a buffer for the dependencies.
        lpDependencies = (LPENUM_SERVICE_STATUS) HeapAlloc( 
            GetProcessHeap(), HEAP_ZERO_MEMORY, dwBytesNeeded );
  
        if ( !lpDependencies )
            return FALSE;

        __try {
            // Enumerate the dependencies.
            if ( !EnumDependentServices( schService, SERVICE_ACTIVE, 
                lpDependencies, dwBytesNeeded, &dwBytesNeeded,
                &dwCount ) )
            return FALSE;

            for ( i = 0; i < dwCount; i++ ) 
            {
                ess = *(lpDependencies + i);
                // Open the service.
                hDepService = OpenService( schSCManager, 
                   ess.lpServiceName, 
                   SERVICE_STOP | SERVICE_QUERY_STATUS );

                if ( !hDepService )
                   return FALSE;

                __try {
                    // Send a stop code.
                    if ( !ControlService( hDepService, 
                            SERVICE_CONTROL_STOP,
                            (LPSERVICE_STATUS) &ssp ) )
                    return FALSE;

                    // Wait for the service to stop.
                    while ( ssp.dwCurrentState != SERVICE_STOPPED ) 
                    {
                        Sleep( ssp.dwWaitHint );
                        if ( !QueryServiceStatusEx( 
                                hDepService, 
                                SC_STATUS_PROCESS_INFO,
                                (LPBYTE)&ssp, 
                                sizeof(SERVICE_STATUS_PROCESS),
                                &dwBytesNeeded ) )
                        return FALSE;

                        if ( ssp.dwCurrentState == SERVICE_STOPPED )
                            break;

                        if ( GetTickCount() - dwStartTime > dwTimeout )
                            return FALSE;
                    }
                } 
                __finally 
                {
                    // Always release the service handle.
                    CloseServiceHandle( hDepService );
                }
            }
        } 
        __finally 
        {
            // Always free the enumeration buffer.
            HeapFree( GetProcessHeap(), 0, lpDependencies );
        }
    } 
    return TRUE;
}


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The Complete Service Sample

 

 

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