/*

* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Negotiation of NAT-Traversal in the IKE

*

*/

#ifndef C_IKEV1NATDISCOVERY_H

#define C_IKEV1NATDISCOVERY_H

#include <e32base.h>

class TIkev1IsakmpStream;

class CProposal_IIList;

class TVendorISAKMP;

class TNATDISAKMP;

class TNATOaISAKMP;

class TInetAddr;

//    Class CIkev1NatDiscovery implents negotiation of NAT-Traversal.

//    The current implementation follows IETF <draft-ietf-ipsec-nat-t-ike-03.txt>.

class CIkev1NatDiscovery : public CBase

    {

public:

    CIkev1NatDiscovery(){};  

    static CIkev1NatDiscovery* NewL(TUint32 aNatFlags);

    ~CIkev1NatDiscovery() {};

    void    BuildNatVendorId(TIkev1IsakmpStream &aMsg);

    void	BuildRfcNatVendorId(TIkev1IsakmpStream &aMsg);

    TBool   CheckNatVendorId(const TVendorISAKMP *aVendorPayload);

    TBool   CheckRfcNatVendorId(const TVendorISAKMP *aVendorPayload);

    void    BuildDiscoveryPayloadsL(TIkev1IsakmpStream &aMsg, TUint16 aHashType,

                                    TUint8 *aICOOKIE, TUint8 *aRCOOKIE,

                                    TInetAddr &aLocalAddr, TInetAddr &aRemoteAddr);

    TUint32 CheckDiscoveryPayloadsL(const CArrayFixFlat<const TNATDISAKMP *> *aNatDPayloadArray,

                                    TUint16 aHashType, TUint8 *aICOOKIE, TUint8 *aRCOOKIE,

                                    TInetAddr &aLocalAddr, TInetAddr &aRemoteAddr);

    void  BuildNatOaPayload(TIkev1IsakmpStream &aMsg, TInetAddr &aLocalAddr, CProposal_IIList *aProposalList);

    TBool GetPeerOriginalAddress(const TNATOaISAKMP *aNatOaPayload, TInetAddr& aRemoteOrigAddr, CProposal_IIList *aProposalList);

private:

    void    CalculateAddrPortHashL(TUint16 aHashType,

                                   TUint8 *aICOOKIE, TUint8 *aRCOOKIE,

                                   TInetAddr &aLocalAddr, TInetAddr &aRemoteAddr);

    TBool   CompareHashData(TUint8 *aHashData, TUint32 aHashLth, TDesC8 &aReferenceHash);   

    TBool        iSupport;  // ETrue = Both ends supports current draft

    TBool		 iRfcSupport; //ETrue = Both ends support current RFC 

    TBuf8<16>    iIetfNattVidHash; // NAT-T vendor id string (= md5("draft-ietf-ipsec-nat-t-ike-05")

    TBuf8<16>    iIetfRfcNattVidHash; // NAT-T vendor id string (= md5("RFC 3947")

    TBool        iHashExists; // ETrue = Hash data below has been calculated

    TBuf8<32>    iLocalAddrPortHash;  // value of the HASH(CKY-I | CKY-R | Local_IP  | Port)

    TBuf8<32>    iRemoteAddrPortHash; // value of the HASH(CKY-I | CKY-R | Remote_IP | Port)        

    };

#endif // C_IKEV1NATDISCOVERY_H