兩個獲取http頁面的c#函數

2024-07-21 02:24:39

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    埋頭苦干一天終于搞定！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 ;
        }

那個掃描漏洞的應用程序包括源代碼我將整理后放到我的站點，如果你需要可以來下載。

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