File: TransportLayerElement.h

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/***************************************************************************
 * TransportLayerElement.cc -- Class TransportLayerElement is a generic    *
 * class that represents a transport layer protocol header. Classes like   *
 * TCPHeader or UDPHeader inherit from it.                                 *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is    *
 * also a registered trademark of Insecure.Com LLC.  This program is free  *
 * software; you may redistribute and/or modify it under the terms of the  *
 * GNU General Public License as published by the Free Software            *
 * Foundation; Version 2 with the clarifications and exceptions described  *
 * below.  This guarantees your right to use, modify, and redistribute     *
 * this software under certain conditions.  If you wish to embed Nmap      *
 * technology into proprietary software, we sell alternative licenses      *
 * (contact sales@insecure.com).  Dozens of software vendors already       *
 * license Nmap technology such as host discovery, port scanning, OS       *
 * detection, version detection, and the Nmap Scripting Engine.            *
 *                                                                         *
 * Note that the GPL places important restrictions on "derived works", yet *
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 * following:                                                              *
 * o Integrates source code from Nmap                                      *
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 *   nmap-os-db or nmap-service-probes.                                    *
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 *                                                                         *
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 * further information.                                                    *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included docs/licenses/OpenSSL.txt file, and distribute   *
 * linked combinations including the two. You must obey the GNU GPL in all *
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 * but you are not obligated to do so.                                     *
 *                                                                         *
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 *                                                                         *
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 * have been found so far).                                                *
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 *                                                                         *
 * This program is distributed in the hope that it will be useful, but     *
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 * included with Nmap.                                                     *
 *                                                                         *
 ***************************************************************************/
/* This code was originally part of the Nping tool.                        */

#ifndef TRANSPORTLAYERELEMENT_H
#define TRANSPORTLAYERELEMENT_H  1

#include "PacketElement.h"

/// class TransportLayerElement -
class TransportLayerElement : public PacketElement {

  public:

    /* Returns source port. */
    virtual u16 getSourcePort() const = 0;

    /* Sets source port. */
    virtual int setSourcePort(u16 val) = 0;

    /* Returns destination port. */
    virtual u16 getDestinationPort() const = 0;

    /* Sets destination port. */
    virtual int setDestinationPort(u16 val) = 0;

    /* Sets checksum. */
    virtual int setSum(u16 val) = 0;

  protected:
    u16 compute_checksum();
};

#endif