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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- WMShatter.h
//
// WMShatter provides the IsSafeWM routine, which returns true iff the
// supplied window message is safe to pass to DispatchMessage, or to
// process in the window procedure.
//
// This is only required, of course, to avoid so-called "shatter" attacks
// to be made against the VNC server, which take advantage of the noddy
// design of the Win32 window messaging system.
//
// The API here is designed to hopefully be future proof, so that if they
// ever come up with a proper way to determine whether a message is safe
// or not then it can just be reimplemented here...
#ifndef __RFB_WIN32_SHATTER_H__
#define __RFB_WIN32_SHATTER_H__
#include <windows.h>
namespace rfb {
namespace win32 {
bool IsSafeWM(HWND window, UINT msg, WPARAM wParam, LPARAM lParam);
LRESULT SafeDefWindowProc(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam);
LRESULT SafeDispatchMessage(const MSG* msg);
};
};
#endif // __RFB_WIN32_SHATTER_H__
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