两个获取http页面的c#函数

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原作者: [db:作者] 来自: [db:来源] 收藏邀请

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()+"\r\n");
   }

   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: 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 ;
   }