/* H460_std23.h
 *
 * Copyright (c) 2009 ISVO (Asia) Pte Ltd. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Alternatively, the contents of this file may be used under the terms
 * of the General Public License (the  "GNU License"), in which case the
 * provisions of GNU License are applicable instead of those
 * above. If you wish to allow use of your version of this file only
 * under the terms of the GNU License and not to allow others to use
 * your version of this file under the MPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the GNU License. If you do not delete
 * the provisions above, a recipient may use your version of this file
 * under either the MPL or the GNU License."
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is derived from and used in conjunction with the 
 * H323Plus Project (www.h323plus.org/)
 *
 * The Initial Developer of the Original Code is ISVO (Asia) Pte Ltd.
 *
 *
 * Contributor(s): ______________________________________.
 *
 * $Id: h460_std23.h,v 1.17 2012/12/10 17:56:08 shorne Exp $
 *
 */

#ifndef H_H460_Featurestd23
#define H_H460_Featurestd23


#include <h460/h4601.h>
#include <ptlib/plugin.h>
#include <ptclib/pstun.h>

#if _MSC_VER
#pragma once
#endif


class H323EndPoint;
class H460_FeatureStd23;
class PNatMethod_H46024  : public PSTUNClient
{

    PCLASSINFO(PNatMethod_H46024, PNatMethod); 

    public:
        PNatMethod_H46024();

        ~PNatMethod_H46024();

#if PTLIB_VER > 2120
        static PString GetNatMethodName() { return "H46024"; }
        virtual PString GetName() const
               { return GetNatMethodName(); }
#else
        static PStringList GetNatMethodName() {  return PStringArray("H46024"); };
        virtual PString GetName() const
                { return GetNatMethodName()[0]; }
#endif

        // Start the Nat Method testing
        void Start(const PString & server,H460_FeatureStd23 * _feat);

        // Whether the NAT method is Available
        virtual bool IsAvailable(
                const PIPSocket::Address & binding = PIPSocket::GetDefaultIpAny()  ///< Interface to see if NAT is available on
        );

        // Create the socket pair
        virtual PBoolean CreateSocketPair(
          PUDPSocket * & socket1,
          PUDPSocket * & socket2,
          const PIPSocket::Address & binding = PIPSocket::GetDefaultIpAny(),
          void * userData = NULL
        );

        // Whether the NAT Method is available
        void SetAvailable();

        // Whether the NAT method is activated for this call
        virtual void Activate(bool act);

        // Reportable NAT Type
        PSTUNClient::NatTypes GetNATType();

        // Set Port Information
        void SetPortInformation(PortInfo & pairedPortInfo, WORD portPairBase, WORD portPairMax);

        //  CreateRandomPortPair
        WORD CreateRandomPortPair(unsigned int start, unsigned int end);

#if PTLIB_VER >= 2110
    virtual PString GetServer() const { return PString(); }
    virtual bool GetServerAddress(PIPSocketAddressAndPort & ) const { return false; }
    virtual NatTypes GetNatType(bool force) { return PSTUNClient::GetNatType(force); }
    virtual NatTypes GetNatType(const PTimeInterval &) { return UnknownNat; }
    virtual bool SetServer(const PString & server) { return PSTUNClient::SetServer(server); }
    virtual bool Open(const PIPSocket::Address &) { return false; }
    virtual bool CreateSocket(BYTE,PUDPSocket * &, const PIPSocket::Address,WORD)  { return false; }
    virtual void SetCredentials(const PString &, const PString &, const PString &) {}
#endif

protected:
        // Do a NAT test
        PSTUNClient::NatTypes NATTest();

        void SetConnectionSockets(PUDPSocket * data,  PUDPSocket * control,  
                              H323Connection::SessionInformation * info );

private:
        PThread *               mainThread;
        PDECLARE_NOTIFIER(PThread, PNatMethod_H46024, MainMethod);
        bool                    isActive;
        bool                    isAvailable;
        PSTUNClient::NatTypes   natType;
        H460_FeatureStd23 *     feat;
        PMutex                  portMute;

#ifdef H323_H46019M
        PortInfo                standardPorts;
        PortInfo                multiplexPorts;
#endif

        friend class H323EndPoint;
};

///////////////////////////////////////////////////////////////////////////////

class H460_FeatureStd23 : public H460_FeatureStd 
{
    PCLASSINFO(H460_FeatureStd23, H460_FeatureStd);

public:

    H460_FeatureStd23();
    virtual ~H460_FeatureStd23();

    // Universal Declarations Every H460 Feature should have the following
    virtual void AttachEndPoint(H323EndPoint * _ep);

    static PStringArray GetFeatureName() { return PStringArray("Std23"); };
    static PStringArray GetFeatureFriendlyName() { return PStringArray("P2Pnat Detect-H.460.23"); };
    static int GetPurpose()    { return FeatureRas; };
    static PStringArray GetIdentifier() { return PStringArray("23"); };

    virtual PBoolean CommonFeature() { return isEnabled; }

    // Messages
    // GK -> EP
    virtual PBoolean OnSendGatekeeperRequest(H225_FeatureDescriptor & pdu);
    virtual void OnReceiveGatekeeperConfirm(const H225_FeatureDescriptor & pdu);

    virtual PBoolean OnSendRegistrationRequest(H225_FeatureDescriptor & pdu);
    virtual void OnReceiveRegistrationConfirm(const H225_FeatureDescriptor & pdu);

    H323EndPoint * GetEndPoint() { return (H323EndPoint *)EP; }

    // Reporting the NAT Type
    void OnNATTypeDetection(PSTUNClient::NatTypes type, const PIPSocket::Address & ExtIP);

    bool IsAvailable();

    bool AlternateNATMethod();
    bool UseAlternate();

protected:
    bool DetectALG(const PIPSocket::Address & detectAddress);
    void StartSTUNTest(const PString & server);
    
#ifdef H323_UPnP
    bool IsAlternateAvailable(PString & name);
#endif
    void DelayedReRegistration();
 
private:
    H323EndPoint *            EP;
    PSTUNClient::NatTypes    natType;
    PIPSocket::Address       externalIP;
    PBoolean                 natNotify;
    PBoolean                 alg;
    PBoolean                 isavailable;
    PBoolean                 isEnabled; 
    int                      useAlternate;

    // Delayed Reregistration
    PThread  *  RegThread;
    PDECLARE_NOTIFIER(PThread, H460_FeatureStd23, RegMethod);

};

// Need to declare for Factory Loader
#if !defined(_WIN32_WCE)
    #if PTLIB_VER > 260
       PPLUGIN_STATIC_LOAD(Std23, H460_Feature);
    #else
       PWLIB_STATIC_LOAD_PLUGIN(Std23, H460_Feature);
    #endif
#endif


////////////////////////////////////////////////////////

class H323EndPoint;
class H323Connection;
class H460_FeatureStd24 : public H460_FeatureStd 
{
    PCLASSINFO(H460_FeatureStd24, H460_FeatureStd);

public:

    H460_FeatureStd24();
    virtual ~H460_FeatureStd24();

    // Universal Declarations Every H460 Feature should have the following
    virtual void AttachEndPoint(H323EndPoint * _ep);
    virtual void AttachConnection(H323Connection * _ep);

    static PStringArray GetFeatureName() { return PStringArray("Std24"); };
    static PStringArray GetFeatureFriendlyName() { return PStringArray("P2Pnat Media-H.460.24"); };
    static int GetPurpose()    { return FeatureSignal; };
    static PStringArray GetIdentifier() { return PStringArray("24"); };

    virtual PBoolean CommonFeature() { return isEnabled; }

    enum NatInstruct {
        e_unknown,
        e_noassist,
        e_localMaster,
        e_remoteMaster,
        e_localProxy,
        e_remoteProxy,
        e_natFullProxy,
        e_natAnnexA,                // Same NAT
        e_natAnnexB,                // NAT Offload
        e_natFailure = 100
    };

    static PString GetNATStrategyString(NatInstruct method);

    enum H46024NAT {
        e_default,        // This will use the underlying NAT Method
        e_enable,        // Use H.460.24 method (STUN)
        e_AnnexA,       // Disable H.460.24 method but initiate AnnexA
        e_AnnexB,        // Disable H.460.24 method but initiate AnnexB
        e_disable        // Disable all and remote will do the NAT help        
    };

    static PString GetH460NATString(H46024NAT method);

    // Messages
    virtual PBoolean OnSendAdmissionRequest(H225_FeatureDescriptor & pdu);
    virtual void OnReceiveAdmissionConfirm(const H225_FeatureDescriptor & pdu);
    virtual void OnReceiveAdmissionReject(const H225_FeatureDescriptor & pdu);

    virtual PBoolean OnSendSetup_UUIE(H225_FeatureDescriptor & pdu);
    virtual void OnReceiveSetup_UUIE(const H225_FeatureDescriptor & pdu);

protected:
    void HandleNATInstruction(NatInstruct natconfig);
    void SetNATMethods(H46024NAT state);
    void SetH46019State(bool state);
    PBoolean IsNatSendAvailable();
 
private:
    H323EndPoint * EP;
    H323Connection * CON;
    NatInstruct natconfig;
    PMutex h460mute;
    int nattype;
    bool isEnabled;
    bool useAlternate;

};

inline ostream & operator<<(ostream & strm, H460_FeatureStd24::NatInstruct method) { return strm << H460_FeatureStd24::GetNATStrategyString(method); }

// Need to declare for Factory Loader
#if !defined(_WIN32_WCE)
    #if PTLIB_VER > 260
       PPLUGIN_STATIC_LOAD(Std24, H460_Feature);
    #else
       PWLIB_STATIC_LOAD_PLUGIN(Std24, H460_Feature);
    #endif
#endif

#endif 

