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/*
 * h225ras.h
 *
 * H.225 RAS protocol handler
 *
 * Open H323 Library
 *
 * Copyright (c) 2001 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (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/
 *
 * 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 Open H323 Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Portions of this code were written with the assisance of funding from
 * iFace, Inc. http://www.iface.com
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: h225ras.h,v $
 * Revision 1.6  2011/02/22 05:04:57  shorne
 * Enable selectively removing capabilities based on the features PDU's advertising feature. H.460.9 now advertises in ARQ when receiving call.
 *
 * Revision 1.5  2011/02/20 06:55:46  shorne
 * Fixes for H.460 to allow better selection of mesasage location in PDU. Features or Generic Data. Corrected H.460.9
 *
 * Revision 1.4  2009/11/29 23:31:05  shorne
 * BUG FIX : completely disable H.460 support if remote does not support it.
 *
 * Revision 1.3  2009/02/22 02:02:05  shorne
 * Added ability to enable SCI/SCR without needing H248 support
 *
 * Revision 1.2  2008/05/23 11:19:23  willamowius
 * switch BOOL to PBoolean to be able to compile with Ptlib 2.2.x
 *
 * Revision 1.1  2007/08/06 20:50:48  shorne
 * First commit of h323plus
 *
 * Revision 1.40  2005/11/30 13:05:01  csoutheren
 * Changed tags for Doxygen
 *
 * Revision 1.39  2005/01/03 14:03:20  csoutheren
 * Added new configure options and ability to disable/enable modules
 *
 * Revision 1.38  2005/01/03 06:25:52  csoutheren
 * Added extensive support for disabling code modules at compile time
 *
 * Revision 1.37  2004/09/07 22:50:55  rjongbloed
 * Changed usage of template function as MSVC6 will not compile it.
 *
 * Revision 1.36  2004/09/03 01:06:09  csoutheren
 * Added initial hooks for H.460 GEF
 * Thanks to Simon Horne and ISVO (Asia) Pte Ltd. for this contribution
 *
 * Revision 1.35  2003/04/01 01:05:39  robertj
 * Split service control handlers from H.225 RAS header.
 *
 * Revision 1.34  2003/03/20 01:51:07  robertj
 * More abstraction of H.225 RAS and H.501 protocols transaction handling.
 *
 * Revision 1.33  2003/03/01 00:23:42  craigs
 * New PeerElement implementation
 *
 * Revision 1.32  2003/02/21 07:23:18  robertj
 * Fixed up some comments
 *
 * Revision 1.31  2003/02/21 05:28:39  craigs
 * Factored out code for user with peer elements
 *
 * Revision 1.30  2003/02/01 13:31:14  robertj
 * Changes to support CAT authentication in RAS.
 *
 * Revision 1.29  2002/11/28 04:41:44  robertj
 * Added support for RAS ServiceControlIndication command.
 *
 * Revision 1.28  2002/11/27 06:54:52  robertj
 * Added Service Control Session management as per Annex K/H.323 via RAS
 *   only at this stage.
 * Added H.248 ASN and very primitive infrastructure for linking into the
 *   Service Control Session management system.
 * Added basic infrastructure for Annex K/H.323 HTTP transport system.
 * Added Call Credit Service Control to display account balances.
 *
 * Revision 1.27  2002/11/21 22:26:09  robertj
 * Changed promiscuous mode to be three way. Fixes race condition in gkserver
 *   which can cause crashes or more PDUs to be sent to the wrong place.
 *
 * Revision 1.26  2002/11/21 07:21:46  robertj
 * Improvements to alternate gatekeeper client code, thanks Kevin Bouchard
 *
 * Revision 1.25  2002/11/11 07:20:08  robertj
 * Minor clean up of API for doing RAS requests suing authentication.
 *
 * Revision 1.24  2002/11/04 11:52:08  robertj
 * Fixed comment
 *
 * Revision 1.23  2002/10/17 02:09:01  robertj
 * Backed out previous change for including PDU tag, doesn't work!
 *
 * Revision 1.22  2002/10/16 03:40:12  robertj
 * Added PDU tag to cache look up key.
 *
 * Revision 1.21  2002/09/19 09:15:56  robertj
 * Fixed problem with making (and assuring with multi-threading) IRQ and DRQ
 *   requests are sent to the correct endpoint address, thanks Martijn Roest.
 *
 * Revision 1.20  2002/09/16 01:14:15  robertj
 * Added #define so can select if #pragma interface/implementation is used on
 *   platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan.
 *
 * Revision 1.19  2002/09/03 05:37:17  robertj
 * Normalised the multi-include header prevention ifdef/define symbol.
 * Added RAS port constants to RAS clas name space.
 *
 * Revision 1.18  2002/08/12 06:29:55  robertj
 * Fixed problem with cached responses being aged before the RIP time which
 *   made retries by client appear as "new" requests when they were not.
 *
 * Revision 1.17  2002/08/12 05:38:20  robertj
 * Changes to the RAS subsystem to support ability to make requests to client
 *   from gkserver without causing bottlenecks and race conditions.
 *
 * Revision 1.16  2002/08/05 10:03:47  robertj
 * Cosmetic changes to normalise the usage of pragma interface/implementation.
 *
 * Revision 1.15  2002/08/05 05:17:37  robertj
 * Fairly major modifications to support different authentication credentials
 *   in ARQ to the logged in ones on RRQ. For both client and server.
 * Various other H.235 authentication bugs and anomalies fixed on the way.
 *
 * Revision 1.14  2002/07/29 11:36:08  robertj
 * Fixed race condition if RIP is followed very quickly by actual response.
 *
 * Revision 1.13  2002/06/26 03:47:45  robertj
 * Added support for alternate gatekeepers.
 *
 * Revision 1.12  2002/06/21 02:52:44  robertj
 * Fixed problem with double checking H.235 hashing, this causes failure as
 *   the authenticator thinks it is a replay attack.
 *
 * Revision 1.11  2002/06/12 03:49:56  robertj
 * Added PrintOn function for trace output of RAS channel.
 *
 * Revision 1.10  2002/05/03 09:18:45  robertj
 * Added automatic retransmission of RAS responses to retried requests.
 *
 * Revision 1.9  2001/10/09 08:04:59  robertj
 * Fixed unregistration so still unregisters if gk goes offline, thanks Chris Purvis
 *
 * Revision 1.8  2001/09/18 10:36:54  robertj
 * Allowed multiple overlapping requests in RAS channel.
 *
 * Revision 1.7  2001/09/12 03:12:36  robertj
 * Added ability to disable the checking of RAS responses against
 *   security authenticators.
 * Fixed bug in having multiple authentications if have a retry.
 *
 * Revision 1.6  2001/08/10 11:03:49  robertj
 * Major changes to H.235 support in RAS to support server.
 *
 * Revision 1.5  2001/08/06 07:44:52  robertj
 * Fixed problems with building without SSL
 *
 * Revision 1.4  2001/08/06 03:18:35  robertj
 * Fission of h323.h to h323ep.h & h323con.h, h323.h now just includes files.
 * Improved access to H.235 secure RAS functionality.
 * Changes to H.323 secure RAS contexts to help use with gk server.
 *
 * Revision 1.3  2001/06/25 01:06:40  robertj
 * Fixed resolution of RAS timeout so not rounded down to second.
 *
 * Revision 1.2  2001/06/22 00:21:10  robertj
 * Fixed bug in H.225 RAS protocol with 16 versus 32 bit sequence numbers.
 *
 * Revision 1.1  2001/06/18 06:23:47  robertj
 * Split raw H.225 RAS protocol out of gatekeeper client class.
 *
 */

#ifndef __OPAL_H225RAS_H
#define __OPAL_H225RAS_H

#ifdef P_USE_PRAGMA
#pragma interface
#endif

#include "openh323buildopts.h"
#include "transports.h"
#include "h235auth.h"
#include "h323trans.h"
#include "svcctrl.h"

class PASN_Sequence;
class PASN_Choice;

class H225_GatekeeperRequest;
class H225_GatekeeperConfirm;
class H225_GatekeeperReject;
class H225_RegistrationRequest;
class H225_RegistrationConfirm;
class H225_RegistrationReject;
class H225_UnregistrationRequest;
class H225_UnregistrationConfirm;
class H225_UnregistrationReject;
class H225_AdmissionRequest;
class H225_AdmissionConfirm;
class H225_AdmissionReject;
class H225_BandwidthRequest;
class H225_BandwidthConfirm;
class H225_BandwidthReject;
class H225_DisengageRequest;
class H225_DisengageConfirm;
class H225_DisengageReject;
class H225_LocationRequest;
class H225_LocationConfirm;
class H225_LocationReject;
class H225_InfoRequest;
class H225_InfoRequestResponse;
class H225_NonStandardMessage;
class H225_UnknownMessageResponse;
class H225_RequestInProgress;
class H225_ResourcesAvailableIndicate;
class H225_ResourcesAvailableConfirm;
class H225_InfoRequestAck;
class H225_InfoRequestNak;
class H225_ArrayOf_CryptoH323Token;
class H225_FeatureSet;

class H323EndPoint;
class H323RasPDU;



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

/**This class embodies the H.225.0 RAS protocol to/from gatekeepers.
  */
class H225_RAS : public H323Transactor
{
  PCLASSINFO(H225_RAS, H323Transactor);
  public:
  /**@name Construction */
  //@{
    enum {
      DefaultRasMulticastPort = 1718,
      DefaultRasUdpPort = 1719
    };

    /**Create a new protocol handler.
     */
    H225_RAS(
      H323EndPoint & endpoint,  ///< Endpoint gatekeeper is associated with.
      H323Transport * transport ///< Transport over which gatekeepers communicates.
    );

    /**Destroy protocol handler.
     */
    ~H225_RAS();
  //@}

  /**@name Overrides from PObject */
  //@{
    /**Print the name of the gatekeeper.
      */
    void PrintOn(
      ostream & strm    ///< Stream to print to.
    ) const;
  //@}

  /**@name Overrides from H323Transactor */
  //@{
    /**Create the transaction PDU for reading.
      */
    virtual H323TransactionPDU * CreateTransactionPDU() const;

    /**Handle and dispatch a transaction PDU
      */
    virtual PBoolean HandleTransaction(
      const PASN_Object & rawPDU
    );

    /**Allow for modifications to PDU on send.
      */
    virtual void OnSendingPDU(
      PASN_Object & rawPDU
    );
  //@}

  /**@name Protocol callbacks */
  //@{
    virtual void OnSendGatekeeperRequest(H323RasPDU &, H225_GatekeeperRequest &);
    virtual void OnSendGatekeeperConfirm(H323RasPDU &, H225_GatekeeperConfirm &);
    virtual void OnSendGatekeeperReject(H323RasPDU &, H225_GatekeeperReject &);
    virtual void OnSendGatekeeperRequest(H225_GatekeeperRequest &);
    virtual void OnSendGatekeeperConfirm(H225_GatekeeperConfirm &);
    virtual void OnSendGatekeeperReject(H225_GatekeeperReject &);
    virtual PBoolean OnReceiveGatekeeperRequest(const H323RasPDU &, const H225_GatekeeperRequest &);
    virtual PBoolean OnReceiveGatekeeperConfirm(const H323RasPDU &, const H225_GatekeeperConfirm &);
    virtual PBoolean OnReceiveGatekeeperReject(const H323RasPDU &, const H225_GatekeeperReject &);
    virtual PBoolean OnReceiveGatekeeperRequest(const H225_GatekeeperRequest &);
    virtual PBoolean OnReceiveGatekeeperConfirm(const H225_GatekeeperConfirm &);
    virtual PBoolean OnReceiveGatekeeperReject(const H225_GatekeeperReject &);

    virtual void OnSendRegistrationRequest(H323RasPDU &, H225_RegistrationRequest &);
    virtual void OnSendRegistrationConfirm(H323RasPDU &, H225_RegistrationConfirm &);
    virtual void OnSendRegistrationReject(H323RasPDU &, H225_RegistrationReject &);
    virtual void OnSendRegistrationRequest(H225_RegistrationRequest &);
    virtual void OnSendRegistrationConfirm(H225_RegistrationConfirm &);
    virtual void OnSendRegistrationReject(H225_RegistrationReject &);
    virtual PBoolean OnReceiveRegistrationRequest(const H323RasPDU &, const H225_RegistrationRequest &);
    virtual PBoolean OnReceiveRegistrationConfirm(const H323RasPDU &, const H225_RegistrationConfirm &);
    virtual PBoolean OnReceiveRegistrationReject(const H323RasPDU &, const H225_RegistrationReject &);
    virtual PBoolean OnReceiveRegistrationRequest(const H225_RegistrationRequest &);
    virtual PBoolean OnReceiveRegistrationConfirm(const H225_RegistrationConfirm &);
    virtual PBoolean OnReceiveRegistrationReject(const H225_RegistrationReject &);

    virtual void OnSendUnregistrationRequest(H323RasPDU &, H225_UnregistrationRequest &);
    virtual void OnSendUnregistrationConfirm(H323RasPDU &, H225_UnregistrationConfirm &);
    virtual void OnSendUnregistrationReject(H323RasPDU &, H225_UnregistrationReject &);
    virtual void OnSendUnregistrationRequest(H225_UnregistrationRequest &);
    virtual void OnSendUnregistrationConfirm(H225_UnregistrationConfirm &);
    virtual void OnSendUnregistrationReject(H225_UnregistrationReject &);
    virtual PBoolean OnReceiveUnregistrationRequest(const H323RasPDU &, const H225_UnregistrationRequest &);
    virtual PBoolean OnReceiveUnregistrationConfirm(const H323RasPDU &, const H225_UnregistrationConfirm &);
    virtual PBoolean OnReceiveUnregistrationReject(const H323RasPDU &, const H225_UnregistrationReject &);
    virtual PBoolean OnReceiveUnregistrationRequest(const H225_UnregistrationRequest &);
    virtual PBoolean OnReceiveUnregistrationConfirm(const H225_UnregistrationConfirm &);
    virtual PBoolean OnReceiveUnregistrationReject(const H225_UnregistrationReject &);

    virtual void OnSendAdmissionRequest(H323RasPDU &, H225_AdmissionRequest &);
    virtual void OnSendAdmissionConfirm(H323RasPDU &, H225_AdmissionConfirm &);
    virtual void OnSendAdmissionReject(H323RasPDU &, H225_AdmissionReject &);
    virtual void OnSendAdmissionRequest(H225_AdmissionRequest &);
    virtual void OnSendAdmissionConfirm(H225_AdmissionConfirm &);
    virtual void OnSendAdmissionReject(H225_AdmissionReject &);
    virtual PBoolean OnReceiveAdmissionRequest(const H323RasPDU &, const H225_AdmissionRequest &);
    virtual PBoolean OnReceiveAdmissionConfirm(const H323RasPDU &, const H225_AdmissionConfirm &);
    virtual PBoolean OnReceiveAdmissionReject(const H323RasPDU &, const H225_AdmissionReject &);
    virtual PBoolean OnReceiveAdmissionRequest(const H225_AdmissionRequest &);
    virtual PBoolean OnReceiveAdmissionConfirm(const H225_AdmissionConfirm &);
    virtual PBoolean OnReceiveAdmissionReject(const H225_AdmissionReject &);

    virtual void OnSendBandwidthRequest(H323RasPDU &, H225_BandwidthRequest &);
    virtual void OnSendBandwidthConfirm(H323RasPDU &, H225_BandwidthConfirm &);
    virtual void OnSendBandwidthReject(H323RasPDU &, H225_BandwidthReject &);
    virtual void OnSendBandwidthRequest(H225_BandwidthRequest &);
    virtual void OnSendBandwidthConfirm(H225_BandwidthConfirm &);
    virtual void OnSendBandwidthReject(H225_BandwidthReject &);
    virtual PBoolean OnReceiveBandwidthRequest(const H323RasPDU &, const H225_BandwidthRequest &);
    virtual PBoolean OnReceiveBandwidthConfirm(const H323RasPDU &, const H225_BandwidthConfirm &);
    virtual PBoolean OnReceiveBandwidthReject(const H323RasPDU &, const H225_BandwidthReject &);
    virtual PBoolean OnReceiveBandwidthRequest(const H225_BandwidthRequest &);
    virtual PBoolean OnReceiveBandwidthConfirm(const H225_BandwidthConfirm &);
    virtual PBoolean OnReceiveBandwidthReject(const H225_BandwidthReject &);

    virtual void OnSendDisengageRequest(H323RasPDU &, H225_DisengageRequest &);
    virtual void OnSendDisengageConfirm(H323RasPDU &, H225_DisengageConfirm &);
    virtual void OnSendDisengageReject(H323RasPDU &, H225_DisengageReject &);
    virtual void OnSendDisengageRequest(H225_DisengageRequest &);
    virtual void OnSendDisengageConfirm(H225_DisengageConfirm &);
    virtual void OnSendDisengageReject(H225_DisengageReject &);
    virtual PBoolean OnReceiveDisengageRequest(const H323RasPDU &, const H225_DisengageRequest &);
    virtual PBoolean OnReceiveDisengageConfirm(const H323RasPDU &, const H225_DisengageConfirm &);
    virtual PBoolean OnReceiveDisengageReject(const H323RasPDU &, const H225_DisengageReject &);
    virtual PBoolean OnReceiveDisengageRequest(const H225_DisengageRequest &);
    virtual PBoolean OnReceiveDisengageConfirm(const H225_DisengageConfirm &);
    virtual PBoolean OnReceiveDisengageReject(const H225_DisengageReject &);

    virtual void OnSendLocationRequest(H323RasPDU &, H225_LocationRequest &);
    virtual void OnSendLocationConfirm(H323RasPDU &, H225_LocationConfirm &);
    virtual void OnSendLocationReject(H323RasPDU &, H225_LocationReject &);
    virtual void OnSendLocationRequest(H225_LocationRequest &);
    virtual void OnSendLocationConfirm(H225_LocationConfirm &);
    virtual void OnSendLocationReject(H225_LocationReject &);
    virtual PBoolean OnReceiveLocationRequest(const H323RasPDU &, const H225_LocationRequest &);
    virtual PBoolean OnReceiveLocationConfirm(const H323RasPDU &, const H225_LocationConfirm &);
    virtual PBoolean OnReceiveLocationReject(const H323RasPDU &, const H225_LocationReject &);
    virtual PBoolean OnReceiveLocationRequest(const H225_LocationRequest &);
    virtual PBoolean OnReceiveLocationConfirm(const H225_LocationConfirm &);
    virtual PBoolean OnReceiveLocationReject(const H225_LocationReject &);

    virtual void OnSendInfoRequest(H323RasPDU &, H225_InfoRequest &);
    virtual void OnSendInfoRequestAck(H323RasPDU &, H225_InfoRequestAck &);
    virtual void OnSendInfoRequestNak(H323RasPDU &, H225_InfoRequestNak &);
    virtual void OnSendInfoRequestResponse(H323RasPDU &, H225_InfoRequestResponse &);
    virtual void OnSendInfoRequest(H225_InfoRequest &);
    virtual void OnSendInfoRequestAck(H225_InfoRequestAck &);
    virtual void OnSendInfoRequestNak(H225_InfoRequestNak &);
    virtual void OnSendInfoRequestResponse(H225_InfoRequestResponse &);
    virtual PBoolean OnReceiveInfoRequest(const H323RasPDU &, const H225_InfoRequest &);
    virtual PBoolean OnReceiveInfoRequestAck(const H323RasPDU &, const H225_InfoRequestAck &);
    virtual PBoolean OnReceiveInfoRequestNak(const H323RasPDU &, const H225_InfoRequestNak &);
    virtual PBoolean OnReceiveInfoRequestResponse(const H323RasPDU &, const H225_InfoRequestResponse &);
    virtual PBoolean OnReceiveInfoRequest(const H225_InfoRequest &);
    virtual PBoolean OnReceiveInfoRequestAck(const H225_InfoRequestAck &);
    virtual PBoolean OnReceiveInfoRequestNak(const H225_InfoRequestNak &);
    virtual PBoolean OnReceiveInfoRequestResponse(const H225_InfoRequestResponse &);

    virtual void OnSendResourcesAvailableIndicate(H323RasPDU &, H225_ResourcesAvailableIndicate &);
    virtual void OnSendResourcesAvailableConfirm(H323RasPDU &, H225_ResourcesAvailableConfirm &);
    virtual void OnSendResourcesAvailableIndicate(H225_ResourcesAvailableIndicate &);
    virtual void OnSendResourcesAvailableConfirm(H225_ResourcesAvailableConfirm &);
    virtual PBoolean OnReceiveResourcesAvailableIndicate(const H323RasPDU &, const H225_ResourcesAvailableIndicate &);
    virtual PBoolean OnReceiveResourcesAvailableConfirm(const H323RasPDU &, const H225_ResourcesAvailableConfirm &);
    virtual PBoolean OnReceiveResourcesAvailableIndicate(const H225_ResourcesAvailableIndicate &);
    virtual PBoolean OnReceiveResourcesAvailableConfirm(const H225_ResourcesAvailableConfirm &);

    virtual void OnSendServiceControlIndication(H323RasPDU &, H225_ServiceControlIndication &);
    virtual void OnSendServiceControlResponse(H323RasPDU &, H225_ServiceControlResponse &);
    virtual void OnSendServiceControlIndication(H225_ServiceControlIndication &);
    virtual void OnSendServiceControlResponse(H225_ServiceControlResponse &);
    virtual PBoolean OnReceiveServiceControlIndication(const H323RasPDU &, const H225_ServiceControlIndication &);
    virtual PBoolean OnReceiveServiceControlResponse(const H323RasPDU &, const H225_ServiceControlResponse &);
    virtual PBoolean OnReceiveServiceControlIndication(const H225_ServiceControlIndication &);
    virtual PBoolean OnReceiveServiceControlResponse(const H225_ServiceControlResponse &);

    virtual void OnSendNonStandardMessage(H323RasPDU &, H225_NonStandardMessage &);
    virtual void OnSendNonStandardMessage(H225_NonStandardMessage &);
    virtual PBoolean OnReceiveNonStandardMessage(const H323RasPDU &, const H225_NonStandardMessage &);
    virtual PBoolean OnReceiveNonStandardMessage(const H225_NonStandardMessage &);

    virtual void OnSendUnknownMessageResponse(H323RasPDU &, H225_UnknownMessageResponse &);
    virtual void OnSendUnknownMessageResponse(H225_UnknownMessageResponse &);
    virtual PBoolean OnReceiveUnknownMessageResponse(const H323RasPDU &, const H225_UnknownMessageResponse &);
    virtual PBoolean OnReceiveUnknownMessageResponse(const H225_UnknownMessageResponse &);

    virtual void OnSendRequestInProgress(H323RasPDU &, H225_RequestInProgress &);
    virtual void OnSendRequestInProgress(H225_RequestInProgress &);
    virtual PBoolean OnReceiveRequestInProgress(const H323RasPDU &, const H225_RequestInProgress &);
    virtual PBoolean OnReceiveRequestInProgress(const H225_RequestInProgress &);

    virtual PBoolean OnSendFeatureSet(unsigned, H225_FeatureSet &, PBoolean) const
    { return FALSE; }

    virtual void OnReceiveFeatureSet(unsigned, const H225_FeatureSet &) const
    { }

    virtual void DisableFeatureSet(int) const
    { }

    /**Handle unknown PDU type.
      */
    virtual PBoolean OnReceiveUnknown(
      const H323RasPDU & pdu  ///< PDU that was not handled.
    );
  //@}

  /**@name Member variable access */
  //@{
    /**Get the gatekeeper identifer.
       For clients at least one successful registration must have been
       achieved for this field to be filling in.
      */
    const PString & GetIdentifier() const { return gatekeeperIdentifier; }

    /**Set the gatekeeper identifer.
       For servers this allows the identifier to be set and provided to all
       remote clients.
      */
    void SetIdentifier(const PString & id) { gatekeeperIdentifier = id; }
  //@}

  protected:
    // Option variables
    PString gatekeeperIdentifier;
};


#endif // __OPAL_H225RAS_H


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