http tunnel 原理 及 穿透防火墻方法

    // Issue empty line
    Request = "";
    Client<

    // Receive Response From Server
    Client>>Response;

m r a n s

    // Ignore HTTP Version

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    int n = Response.Find(' ');
    Response = Response.Mid(n+1); mr ans

    // Http Response Must be 200 only
    if(Response.Left(3)!="200")
    {
      // Connection refused from HTTP Proxy Server
      AfxMessageBox(Response);
    }

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    // Read Response Lines until you receive an empty line.
    do
    {
      Client>>Response;
      if (Response.IsEmpty())
        break;
    }while (true);

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    // Coooooooool.... Now connected to mail.yahoo.com:25
    // Do further SMTP Protocol here.. mrans.com

  }
  catch (CSocketException * pE)
  {
    pE->ReportError();
  }

mrans.com

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※庫(kù)源碼※
-------------
文件Dns.h包含所有所有DNS相關(guān)的源代碼。它利用了其它的庫(kù)，如SocketEx.h, SocketClient.h, 和NeuroBuffer.h 字串6

※CSocketEx※
-------------

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作為一個(gè)Socket功能的包裹（wapper)類(lèi)。（如果你不是確切知道CSocket怎樣工作的，它是非常笨重和不可信的）所有的函數(shù)根CSocket同名。你可以直接應(yīng)用這個(gè)類(lèi)

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※CSocketClient※
-----------------

mrans.com

派生自CSocketEx，并且根據(jù)詳細(xì)的Winsock錯(cuò)誤拋出適當(dāng)?shù)乩猓╡xceptions). 為了方便的發(fā)送和接收，它定義了兩個(gè)操作符, >> 和<<；如果需要它也交換網(wǎng)絡(luò)序?yàn)橹鳈C(jī)序和主機(jī)序?yàn)榫W(wǎng)絡(luò)序。字串8

※CHttpProxySocketClient※
----------------- www.mrans.com

派生自CSocketClient, 你可以調(diào)用SetProxySettings(ProxyServer, Port) 方法和做代理設(shè)置。接下來(lái)，你可以連接到你想要的主機(jī)和端口。ConnnectTo 方法被覆蓋，它自動(dòng)的實(shí)現(xiàn)了HTTP代理協(xié)議并無(wú)爭(zhēng)論的給你了一個(gè)連接。

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※怎樣利用CHttpProxySocketClient※
---------------------------------
  // e.g. You need to connect to mail.yahoo.com on port 25
  // Through a proxy on 192.0.1.1, on HTTP Proxy 4480
  // CSocketClient is Socket wrapping class
  // When you apply operator << on CString, it writes CString
  // To Socket ending with CRLF
  // When you apply operator >> on CString, it receives
  // Line of response from socket until CRLF
  try
  {
    CHttpProxySocketClient Client;

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    Client.SetProxySettings("192.0.1.1",1979);

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    // Connect to server mail.yahoo.com on port 25
    Client.ConnectTo("mail.yahoo.com",25);

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    // You now have access to mail.yahoo.com on port 25
    // If you do not call SetProxySettings, then
    // you are connected to mail.yahoo.com directly if
    // you have direct access, so always use
    // CHttpProxySocketClient and no need to do any
    // extra coding. 字串8

  }
  catch(CSocketException * pE) {
    pE->ReportError();
  } 字串7