兩個獲取http頁面的c#函數

埋頭苦干一天終於搞定！一個用C#寫的Windows應用程序，作用嘛，就是對ASP程序已知的20種漏洞進行掃描，顯示源程序。在這個應用程序中用到兩種獲得http頁面的方法，一種是直接用httpwebrequest類，而另一種是同服務器通過tcp/ip建立socket連接，直接查詢端口80 ， 為此我寫了以下兩個函數，第一個比較簡單，參數只有一個，就是要求的url , 另外一個比較復雜，也很通用，不僅可以請求http頁面，還可以和其他端口通信，如端口43的whois，端口25的smtp，端口21的FTP甚至pop3等等，三個參數分別是主機名，請求命令和端口。好了，看程序吧。

        //獲取http頁面函數
        PRivate string Get_Http(string a_strUrl)
        {
            string strResult ;
            HttpWebRequest myReq = (HttpWebRequest)
                                   WebRequestFactory.Create(a_strUrl) ;

            try
            {
                HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();
                Stream myStream = HttpWResp.GetResponseStream () ;

                StreamReader sr = new StreamReader(myStream , Encoding.Default);
                StringBuilder strBuilder = new StringBuilder();
                while (-1 != sr.Peek())
                {
                    strBuilder.Append(sr.ReadLine()+"\r\n");
                }
               
                strResult = strBuilder.ToString();
            }
            catch(Exception exp)
            {
                 strResult = "錯誤：" + exp.Message ;
            }

            return strResult ;
           
        }

        //通過同server建立tcp/ip連接，發送socket命令
        private string Get_Socket_Request(string a_strServer , string a_strRequest , Int32 a_intPort)
        {
            //Set up variables and String to write to the server
            Encoding ASCII = Encoding.Default ;
            string Get = a_strRequest + "Connection: Close\r\n\r\n";
            //string Get =
            Byte[] ByteGet = ASCII.GetBytes(Get);
            Byte[] RecvBytes = new Byte[256];
            String strRetPage = null;

            // IPAddress and IPEndPoint represent the endpoint that will
            //   receive the request
            IPAddress hostadd = DNS.Resolve(a_strServer.Substring(7 ,a_strServer.Length - 7));
            IPEndPoint EPhost = new IPEndPoint(hostadd, a_intPort);

            //Create the Socket for sending data over TCP
            Socket s = new Socket(AddressFamily.AfINet, SocketType.SockStream,
                                    ProtocolType.ProtTCP );

            // Connect to host using IPEndPoint
            if (s.Connect(EPhost) != 0)
            {
                strRetPage = "Unable to connect to host";
                return strRetPage;
            }

            // Sent the GET text to the host
            s.Send(ByteGet, ByteGet.Length, 0);

            // Receive the page, loop until all bytes are received
            Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
            strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);

            while (bytes > 0)
            {
                bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
                strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
            }

            return strRetPage ;
        }