/**
  @file

  @brief
  Windows NT Service class library.

  Copyright Abandoned 1998 Irena Pancirov - Irnet Snc
  This file is public domain and comes with NO WARRANTY of any kind
*/
#include <windows.h>
#include <process.h>
#include <stdio.h>
#include "nt_servc.h"


static NTService *pService;

/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */
NTService::NTService()
{

    bOsNT	     = FALSE;
    //service variables
    ServiceName      = NULL;
    hExitEvent	     = 0;
    bPause	     = FALSE;
    bRunning	     = FALSE;
    hThreadHandle    = 0;
    fpServiceThread  = NULL;

    //time-out variables
    nStartTimeOut    = 15000;
    nStopTimeOut     = 86400000;
    nPauseTimeOut    = 5000;
    nResumeTimeOut   = 5000;

    //install variables
    dwDesiredAccess  = SERVICE_ALL_ACCESS;
    dwServiceType    = SERVICE_WIN32_OWN_PROCESS;
    dwStartType      = SERVICE_AUTO_START;
    dwErrorControl   = SERVICE_ERROR_NORMAL;
    szLoadOrderGroup = NULL;
    lpdwTagID	     = NULL;
    szDependencies   = NULL;

    my_argc	     = 0;
    my_argv	     = NULL;
    hShutdownEvent   = 0;
    nError	     = 0;
    dwState	     = 0;
}

/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */
NTService::~NTService()
{
  if (ServiceName != NULL) delete[] ServiceName;
}
/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */

BOOL NTService::GetOS()
{
  bOsNT = FALSE;
  memset(&osVer, 0, sizeof(OSVERSIONINFO));
  osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
  if (GetVersionEx(&osVer))
  {
    if (osVer.dwPlatformId == VER_PLATFORM_WIN32_NT)
      bOsNT = TRUE;
  }
  return bOsNT;
}


/**
  Registers the main service thread with the service manager.

  @param ServiceThread  pointer to the main programs entry function
                        when the service is started
*/


long NTService::Init(LPCSTR szInternName,void *ServiceThread)
{

  pService = this;

  fpServiceThread = (THREAD_FC)ServiceThread;
  ServiceName = new char[lstrlen(szInternName)+1];
  lstrcpy(ServiceName,szInternName);

  SERVICE_TABLE_ENTRY stb[] =
  {
    { (char *)szInternName,(LPSERVICE_MAIN_FUNCTION) ServiceMain} ,
    { NULL, NULL }
  };

  return StartServiceCtrlDispatcher(stb); //register with the Service Manager
}


/**
  Installs the service with Service manager.

  nError values:
  - 0  success
  - 1  Can't open the Service manager
  - 2  Failed to create service.
*/


BOOL NTService::Install(int startType, LPCSTR szInternName,
			LPCSTR szDisplayName,
			LPCSTR szFullPath, LPCSTR szAccountName,
			LPCSTR szPassword)
{
  BOOL ret_val=FALSE;
  SC_HANDLE newService, scm;

  if (!SeekStatus(szInternName,1))
   return FALSE;

  char szFilePath[_MAX_PATH];
  GetModuleFileName(NULL, szFilePath, sizeof(szFilePath));

  // open a connection to the SCM
  if (!(scm = OpenSCManager(0, 0,SC_MANAGER_CREATE_SERVICE)))
    printf("Failed to install the service (Couldn't open the SCM)\n");
  else 				// Install the new service
  {
    if (!(newService=
	  CreateService(scm,
			szInternName,
			szDisplayName,
			dwDesiredAccess,//default: SERVICE_ALL_ACCESS
			dwServiceType,	//default: SERVICE_WIN32_OWN_PROCESS
		    			//default: SERVICE_AUTOSTART
			(startType == 1 ? SERVICE_AUTO_START :
			 SERVICE_DEMAND_START),
			dwErrorControl,	//default: SERVICE_ERROR_NORMAL
			szFullPath,	//exec full path
			szLoadOrderGroup, //default: NULL
			lpdwTagID,	//default: NULL
			szDependencies,	//default: NULL
			szAccountName,	//default: NULL
			szPassword)))	//default: NULL
      printf("Failed to install the service (Couldn't create service)\n");
     else
     {
       printf("Service successfully installed.\n");
       CloseServiceHandle(newService);
       ret_val=TRUE;				// Everything went ok
     }
     CloseServiceHandle(scm);
  }
  return ret_val;
}


/**
  Removes  the service.

  nError values:
  - 0  success
  - 1  Can't open the Service manager
  - 2  Failed to locate service
  - 3  Failed to delete service.
*/


BOOL NTService::Remove(LPCSTR szInternName)
{
  BOOL ret_value=FALSE;
  SC_HANDLE service, scm;

  if (!SeekStatus(szInternName,0))
   return FALSE;

  nError=0;

  // open a connection to the SCM
  if (!(scm = OpenSCManager(0, 0,SC_MANAGER_CREATE_SERVICE)))
  {
    printf("Failed to remove the service (Couldn't open the SCM)\n");
  }
  else
  {
    if ((service = OpenService(scm,szInternName, DELETE)))
    {
      if (!DeleteService(service))
        printf("Failed to remove the service\n");
      else
      {
        printf("Service successfully removed.\n");
	ret_value=TRUE;				// everything went ok
      }
      CloseServiceHandle(service);
    }
    else
      printf("Failed to remove the service (Couldn't open the service)\n");
    CloseServiceHandle(scm);
  }
  return ret_value;
}

/**
  this function should be called before the app. exits to stop
  the service
*/
void NTService::Stop(void)
{
  SetStatus(SERVICE_STOP_PENDING,NO_ERROR, 0, 1, 60000);
  StopService();
  SetStatus(SERVICE_STOPPED, NO_ERROR, 0, 1, 1000);
}

/**
  This is the function that is called from the
  service manager to start the service.
*/


void NTService::ServiceMain(DWORD argc, LPTSTR *argv)
{

  // registration function
  if (!(pService->hServiceStatusHandle =
	RegisterServiceCtrlHandler(pService->ServiceName,
				   (LPHANDLER_FUNCTION)
				   NTService::ServiceCtrlHandler)))
    goto error;

  // notify SCM of progress
  if (!pService->SetStatus(SERVICE_START_PENDING,NO_ERROR, 0, 1, 8000))
    goto error;

  // create the exit event
  if (!(pService->hExitEvent = CreateEvent (0, TRUE, FALSE,0)))
    goto error;

  if (!pService->SetStatus(SERVICE_START_PENDING,NO_ERROR, 0, 3,
			   pService->nStartTimeOut))
    goto error;

  // save start arguments
  pService->my_argc=argc;
  pService->my_argv=argv;

  // start the service
  if (!pService->StartService())
    goto error;

  // Check that the service is now running.
  if (!pService->SetStatus(SERVICE_RUNNING,NO_ERROR, 0, 0, 0))
    goto error;

  // wait for exit event
  WaitForSingleObject (pService->hExitEvent, INFINITE);

  // wait for thread to exit
  if (WaitForSingleObject (pService->hThreadHandle, INFINITE) == WAIT_TIMEOUT)
   CloseHandle(pService->hThreadHandle);

  pService->Exit(0);
  return;

error:
  pService->Exit(GetLastError());
  return;
}

/**
  starts the appliaction thread.
*/

BOOL NTService::StartService()
{
  // Start the real service's thread (application)
  if (!(hThreadHandle = (HANDLE) _beginthread((THREAD_FC)fpServiceThread,0,
					      (void *) this)))
    return FALSE;
  bRunning = TRUE;
  return TRUE;
}
/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */
void NTService::StopService()
{
  bRunning=FALSE;

  // Set the event for application
  if (hShutdownEvent)
     SetEvent(hShutdownEvent);

  // Set the event for ServiceMain
  SetEvent(hExitEvent);
}
/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */
void NTService::PauseService()
{
  bPause = TRUE;
  SuspendThread(hThreadHandle);
}
/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */
void NTService::ResumeService()
{
  bPause=FALSE;
  ResumeThread(hThreadHandle);
}
/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */
BOOL NTService::SetStatus (DWORD dwCurrentState,DWORD dwWin32ExitCode,
			   DWORD dwServiceSpecificExitCode, DWORD dwCheckPoint,
			   DWORD dwWaitHint)
{
  BOOL bRet;
  SERVICE_STATUS serviceStatus;

  dwState=dwCurrentState;

  serviceStatus.dwServiceType	= SERVICE_WIN32_OWN_PROCESS;
  serviceStatus.dwCurrentState = dwCurrentState;

  if (dwCurrentState == SERVICE_START_PENDING)
    serviceStatus.dwControlsAccepted = 0;	//don't accept control events
  else
    serviceStatus.dwControlsAccepted =    (SERVICE_ACCEPT_STOP |
					   SERVICE_ACCEPT_PAUSE_CONTINUE |
					   SERVICE_ACCEPT_SHUTDOWN);

  // if a specific exit code is defined,set up the win32 exit code properly
  if (dwServiceSpecificExitCode == 0)
    serviceStatus.dwWin32ExitCode = dwWin32ExitCode;
  else
    serviceStatus.dwWin32ExitCode = ERROR_SERVICE_SPECIFIC_ERROR;

  serviceStatus.dwServiceSpecificExitCode = dwServiceSpecificExitCode;

  serviceStatus.dwCheckPoint = dwCheckPoint;
  serviceStatus.dwWaitHint   = dwWaitHint;

  // Pass the status to the Service Manager
  if (!(bRet=SetServiceStatus (hServiceStatusHandle, &serviceStatus)))
    StopService();

  return bRet;
}
/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */
void NTService::ServiceCtrlHandler(DWORD ctrlCode)
{
  DWORD  dwState;

  if (!pService)
    return;

  dwState=pService->dwState;  // get current state

  switch(ctrlCode) {

#ifdef NOT_USED	 /* do we need this ? */
  case SERVICE_CONTROL_PAUSE:
    if (pService->bRunning && ! pService->bPause)
    {
      dwState = SERVICE_PAUSED;
      pService->SetStatus(SERVICE_PAUSE_PENDING,NO_ERROR, 0, 1,
			  pService->nPauseTimeOut);
      pService->PauseService();
    }
    break;

  case SERVICE_CONTROL_CONTINUE:
    if (pService->bRunning && pService->bPause)
    {
      dwState = SERVICE_RUNNING;
      pService->SetStatus(SERVICE_CONTINUE_PENDING,NO_ERROR, 0, 1,
			  pService->nResumeTimeOut);
      pService->ResumeService();
    }
    break;
#endif

  case SERVICE_CONTROL_SHUTDOWN:
  case SERVICE_CONTROL_STOP:
    dwState = SERVICE_STOP_PENDING;
    pService->SetStatus(SERVICE_STOP_PENDING,NO_ERROR, 0, 1,
			pService->nStopTimeOut);
    pService->StopService();
    break;

  default:
    pService->SetStatus(dwState, NO_ERROR,0, 0, 0);
    break;
  }
  //pService->SetStatus(dwState, NO_ERROR,0, 0, 0);
}

/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */

void NTService::Exit(DWORD error)
{
  if (hExitEvent)
    CloseHandle(hExitEvent);

  // Send a message to the scm to tell that we stop
  if (hServiceStatusHandle)
    SetStatus(SERVICE_STOPPED, error,0, 0, 0);

  // If the thread has started kill it ???
  // if (hThreadHandle) CloseHandle(hThreadHandle);

}

/* ------------------------------------------------------------------------

 -------------------------------------------------------------------------- */

BOOL NTService::SeekStatus(LPCSTR szInternName, int OperationType)
{
  BOOL ret_value=FALSE;
  SC_HANDLE service, scm;

  // open a connection to the SCM
  if (!(scm = OpenSCManager(0, 0,SC_MANAGER_CREATE_SERVICE)))
  {
    DWORD ret_error=GetLastError();
    if (ret_error == ERROR_ACCESS_DENIED)
    {
     printf("Install/Remove of the Service Denied!\n");
     if (!is_super_user())
      printf("That operation should be made by an user with Administrator privileges!\n");
    }
    else
     printf("There is a problem for to open the Service Control Manager!\n");
  }
  else
  {
    if (OperationType == 1)
    {
      /* an install operation */
      if ((service = OpenService(scm,szInternName, SERVICE_ALL_ACCESS )))
      {
	LPQUERY_SERVICE_CONFIG ConfigBuf;
	DWORD dwSize;

	ConfigBuf = (LPQUERY_SERVICE_CONFIG) LocalAlloc(LPTR, 4096);
	printf("The service already exists!\n");
	if (QueryServiceConfig(service,ConfigBuf,4096,&dwSize))
	  printf("The current server installed: %s\n",
		 ConfigBuf->lpBinaryPathName);
	LocalFree(ConfigBuf);
	CloseServiceHandle(service);
      }
      else
	ret_value=TRUE;
    }
    else
    {
      /* a remove operation */
      if (!(service = OpenService(scm,szInternName, SERVICE_ALL_ACCESS )))
	printf("The service doesn't exist!\n");
      else
      {
	SERVICE_STATUS ss;

	memset(&ss, 0, sizeof(ss));
	if (QueryServiceStatus(service,&ss))
	{
	  DWORD dwState = ss.dwCurrentState;
	  if (dwState == SERVICE_RUNNING)
	    printf("Failed to remove the service because the service is running\nStop the service and try again\n");
	  else if (dwState == SERVICE_STOP_PENDING)
	    printf("\
Failed to remove the service because the service is in stop pending state!\n\
Wait 30 seconds and try again.\n\
If this condition persist, reboot the machine and try again\n");
	  else
	    ret_value= TRUE;
	}
	CloseServiceHandle(service);
      }
    }
    CloseServiceHandle(scm);
  }

  return ret_value;
}
/* ------------------------------------------------------------------------
 -------------------------------------------------------------------------- */
BOOL NTService::IsService(LPCSTR ServiceName)
{
  BOOL ret_value=FALSE;
  SC_HANDLE service, scm;
  
  if ((scm= OpenSCManager(0, 0,SC_MANAGER_ENUMERATE_SERVICE)))
  {
    if ((service = OpenService(scm,ServiceName, SERVICE_QUERY_STATUS)))
    {
      ret_value=TRUE;
      CloseServiceHandle(service);
    }
    CloseServiceHandle(scm);
  }
  return ret_value;
}
/* ------------------------------------------------------------------------
 -------------------------------------------------------------------------- */
BOOL NTService::got_service_option(char **argv, char *service_option)
{
  char *option;
  for (option= argv[1]; *option; option++)
    if (!strcmp(option, service_option))
      return TRUE;
  return FALSE;
}
/* ------------------------------------------------------------------------
 -------------------------------------------------------------------------- */
BOOL NTService::is_super_user()
{
  HANDLE hAccessToken;
  UCHAR InfoBuffer[1024];
  PTOKEN_GROUPS ptgGroups=(PTOKEN_GROUPS)InfoBuffer;
  DWORD dwInfoBufferSize;
  PSID psidAdministrators;
  SID_IDENTIFIER_AUTHORITY siaNtAuthority = SECURITY_NT_AUTHORITY;
  UINT x;
  BOOL ret_value=FALSE;
 
  if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE,&hAccessToken ))
  {
   if (GetLastError() != ERROR_NO_TOKEN)
     return FALSE;
 
   if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hAccessToken))
     return FALSE;
  }
 
  ret_value= GetTokenInformation(hAccessToken,TokenGroups,InfoBuffer,
                                 1024, &dwInfoBufferSize);

  CloseHandle(hAccessToken);
 
  if (!ret_value )
    return FALSE;
 
  if (!AllocateAndInitializeSid(&siaNtAuthority, 2,
				SECURITY_BUILTIN_DOMAIN_RID,
				DOMAIN_ALIAS_RID_ADMINS,
				0, 0, 0, 0, 0, 0,
				&psidAdministrators))
    return FALSE;

  ret_value = FALSE;
 
  for (x=0;x<ptgGroups->GroupCount;x++)
  {
   if ( EqualSid(psidAdministrators, ptgGroups->Groups[x].Sid) )
   {
    ret_value = TRUE;
    break;
   }
 
  }
  FreeSid(psidAdministrators);
  return ret_value;
}
