netchck.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: netchck.cpp,v 1.1.1.1.58.1 2004/07/09 02:07:37 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
 * RealNetworks.  You may not use this file except in compliance with
 * the RPSL or, if you have a valid RCSL with RealNetworks applicable
 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
 * portions it created.
 * 
 * This file, and the files included with this file, is distributed
 * and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
 * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
 * ENJOYMENT OR NON-INFRINGEMENT.
 * 
 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
 * 
 * Contributor(s):
 * 
 * ***** END LICENSE BLOCK ***** */

#include "prefdefs.h"
#include "netchck.h"
#include "hxtick.h"
#include "hxassert.h"

CHXNetCheck::CHXNetCheck(UINT32 timeout) :
    XHXNetCheck(timeout), 
    m_phxNetServices(0),
    m_phxTCPSocket(0),
    m_pContext(0),
    m_fConnected(FALSE),
    m_fFailed(FALSE),
    m_lRefCount(0)
{
}

CHXNetCheck::~CHXNetCheck()
{
    if (m_pContext)
        m_pContext->Release();
    m_pContext = NULL;
    
    if (m_phxNetServices)
        m_phxNetServices->Release();
    m_phxNetServices = NULL;

    if (m_phxTCPSocket)
        m_phxTCPSocket->Release();
    m_phxTCPSocket = NULL;
    
}




/////////////////////////////////////////////////////////////////////////
//  Method:
//  IUnknown::QueryInterface
//  Purpose:
//  Implement this to export the interfaces supported by your 
//  object.
//
STDMETHODIMP CHXNetCheck::QueryInterface(REFIID riid, void** ppvObj)
{
    if (IsEqualIID(riid, IID_IUnknown))
    {
        AddRef();
        *ppvObj = this;
        return HXR_OK;
    }
    if (IsEqualIID(riid, IID_IHXTCPResponse))
    {
        AddRef();
        *ppvObj = (IHXTCPResponse*)this;
        return HXR_OK;
    }

    *ppvObj = NULL;
    return HXR_NOINTERFACE;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//  IUnknown::AddRef
//  Purpose:
//  Everyone usually implements this the same... feel free to use
//  this implementation.
//
STDMETHODIMP_(UINT32) CHXNetCheck::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//  IUnknown::Release
//  Purpose:
//  Everyone usually implements this the same... feel free to use
//  this implementation.
//
STDMETHODIMP_(UINT32) CHXNetCheck::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}





/*
 *  IHXTCPResponse methods
 */

/************************************************************************
 *  Method:
 *      IHXTCPResponse::ConnectDone
 *  Purpose:
 *      A Connect operation has been completed or an error has occurred.
 */
STDMETHODIMP CHXNetCheck::ConnectDone   (HX_RESULT      status)
{
    HX_ASSERT(m_fConnected == FALSE); // We shouldn't be getting called if 
    // we aren't expecting it.
    if (status == HXR_OK)
        m_fConnected = TRUE;
    else
        m_fFailed = TRUE;

    return HXR_OK;
}

/************************************************************************
 *  Method:
 *      IHXTCPResponse::ReadDone
 *  Purpose:
 *      A Read operation has been completed or an error has occurred.
 *      The data is returned in the IHXBuffer.
 */
STDMETHODIMP CHXNetCheck::ReadDone      (HX_RESULT      status,
                                         IHXBuffer*     pBuffer)
{
    HX_ASSERT(FALSE);
    return HXR_OK;
}


/************************************************************************
 *  Method:
 *      IHXTCPResponse::WriteReady
 *  Purpose:
 *      This is the response method for WantWrite.
 *      If HX_RESULT is ok, then the TCP channel is ok to Write to.
 */
STDMETHODIMP CHXNetCheck::WriteReady    (HX_RESULT      status)
{
    HX_ASSERT(FALSE);
    return HXR_OK;
}

/************************************************************************
 *  Method:
 *      IHXTCPResponse::Closed
 *  Purpose:
 *      This method is called to inform you that the TCP channel has
 *      been closed by the peer or closed due to error.
 */
STDMETHODIMP CHXNetCheck::Closed(HX_RESULT      status)
{
    m_fConnected = FALSE;
    return HXR_OK;
}




//******************************************************************************
//
// Method:  CHXNetCheck::Init
//
// Purpose: Sets up the CHXNetCheck object with a context.
//      
//
// Notes:   n/a
//
//******************************************************************************


HX_RESULT 
CHXNetCheck::Init(IUnknown *pContext)
{
    if (!pContext)
        return HXR_FAILED;

    m_pContext = pContext;
    m_pContext->AddRef();
    m_pContext->QueryInterface(IID_IHXNetworkServices, (void**)&m_phxNetServices);

    return HXR_OK;
}



//******************************************************************************
//
// Method:  CHXNetCheck::FInternetAvailable
//
// Purpose: Checks to see if the internet is available.  Returns true if it is, 
//          false otherwise.
//      
//
// Notes:   n/a
//
//******************************************************************************


BOOL 
CHXNetCheck::FInternetAvailable(BOOL fPing,BOOL fProxy)
{
    BOOL fRet = TRUE;
    UINT16  nPort = DEF_HTTP_PORT;
    
#ifdef UNIMPLEMENTED
    HKEY hKey = 0 ;
    DWORD fAutoDial = 0 ;
    DWORD regType = 0 ;
    DWORD cbBuf;

    if (fProxy)
        return TRUE;

    //  check the autodial bit in the registry.

    RegOpenKey(HKEY_CURRENT_USER, "Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings",
               &hKey);
    cbBuf = sizeof(fAutoDial);
    if (hKey)
        RegQueryValueEx(hKey, "EnableAutodial", NULL, &regType, (BYTE *) &fAutoDial, &cbBuf);

    if (!fAutoDial) //  if it's not set, go ahead and try the network
    {
        if (fPing)
            fRet = Ping("209.66.98.23", nPort, FALSE);
        else 
            fRet = TRUE;
        goto Ret;
    }
    else // See if we have an active RAS connection
    {       
        DWORD cRasConns = 0;
        RASCONN rgRasConn[5];
        DWORD cb = sizeof(rgRasConn);
        
        if (!m_hRasApiModule)
            m_hRasApiModule= LoadLibrary("rasapi32.dll");

        if (!m_hRasApiModule) // Dialup networking is not installed.
        {
            if (fPing)
                fRet = Ping("209.66.98.23", nPort, FALSE);
            else 
                fRet = TRUE;
            goto Ret;
        }

        if (!m_pRasEnumConnections)
            m_pRasEnumConnections =
                (FPRASENUMCONNECTIONS)GetProcAddress(m_hRasApiModule, (LPCSTR) MAKELONG(565,0));

        if (!m_pRasEnumConnections) // Dialup networking is not installed.
        {
            if (fPing)
                fRet = Ping("209.66.98.23", nPort, FALSE);
            else 
                fRet = TRUE;
            goto Ret;
        }

        rgRasConn[0].dwSize = sizeof(RASCONN);
        m_pRasEnumConnections(rgRasConn, &cb, &cRasConns);
        
        if (cRasConns)
        {
            if (fPing)
                fRet = Ping("209.66.98.23", nPort, FALSE);
            else 
                fRet = TRUE;
            goto Ret;
        }
        else
        {
            fRet = FALSE;
            goto Ret;
        }
    }
  Ret:
#endif
    return (fRet);

}

//******************************************************************************
//
// Method:  CHXNetCheck::Ping
//
// Purpose: Tests to see if we can open a TCP connection to the given hostname. 
//          if fAynchronous is true, we call back a response object provided by
//          the caller (through Init).  Otherwise we block.
//      
//
// Notes:   n/a
//
//******************************************************************************

BOOL CHXNetCheck::Ping(const char *szHostName, UINT16 nPort, BOOL fAsynchronous)
{
    ULONG32 ulStartTime, ulCurrentTime, ulInterval, ulElapsedTime=0;
    BOOL fRet = FALSE;
    
    if (!m_phxTCPSocket)
        m_phxNetServices->CreateTCPSocket(&m_phxTCPSocket);

    m_fFailed = m_fConnected = FALSE;
    m_phxTCPSocket->Init(this);
    
    m_phxTCPSocket->Connect(szHostName, nPort);

    ulInterval = 30000;
    
    // Get start time
    ulStartTime = HX_GET_TICKCOUNT();
    while (!m_fFailed && !m_fConnected && (ulElapsedTime < ulInterval))
    {
        SleepWell(1000);
        ulCurrentTime = HX_GET_TICKCOUNT();
        ulElapsedTime = CALCULATE_ELAPSED_TICKS(ulStartTime, ulCurrentTime);
    }
    fRet = m_fConnected;

    m_phxTCPSocket->Release();
    m_phxTCPSocket = NULL;

    return (fRet);
}

//******************************************************************************
//
// Method:  CHXNetCheck::SleepWell
//
// Purpose: This method sleeps but continues to pump messages.  This allows us to 
//          block properly, even under such platforms as Win16.
//      
//
// Notes:   n/a
//
//******************************************************************************

void CHXNetCheck::SleepWell(ULONG32 ulInterval)
{
#if 0
    ULONG32 ulStartTime, ulCurrentTime;
    MSG             msg;

    
    // Get start time
    ulStartTime = HX_GET_TICKCOUNT();
    do
    {
        // Keep pumping messages
        if(PeekMessage(&msg, NULL,0,0,PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        // If we have waited ulInterval time then drop out
        ulCurrentTime = HX_GET_TICKCOUNT();
    } while (CALCULATE_ELAPSED_TICKS(ulStartTime, ulCurrentTime) < ulInterval);
#endif
}


BOOL 
CHXNetCheck::SmartPing()
{
    HX_ASSERT(FALSE);
    return FALSE;
}