两个获取http页面的c#函数

March 25,2004

埋头苦干一天终于搞定！一个用C#写的windows应用程序，作用嘛，就是对asp程序已知的20种漏洞进行扫描，显示源程序。在这个应用程序中用到两种获得http页面的方法，一种是直接用httpwebrequest类，而另一种是同服务器通过tcp/ip建立socket连接，直接查询端口80 ，为此我写了以下两个函数，第一个比较简单，参数只有一个，就是要求的url , 另外一个比较复杂，也很通用，不仅可以请求http页面，还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，三个参数分别是主机名，请求命令和端口。好了，看程序吧。

      //获取http页面函数
      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()+"rn");
            }

            strResult = strBuilder.ToString();
         }
         catch(Exception exp)
         {
               strResult = "错误：" + exp.Message ;
         }

         return strResult ;

      }

      //通过同server建立tcp/ip连接，发送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: Closernrn";
         //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 ;
      }

那个扫描漏洞的应用程序包括源代码我将整理后放到我的站点，如果你需要可以来下载。