using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;



namespace GetSocket
{

    public class GetSocket
    {
        private static Socket ConnectSocket(string server, int port)
        {
            Socket s = null;
            IPHostEntry hostEntry = null;

            // Get host related information.
            try
            {
                hostEntry = Dns.GetHostEntry(server);
            }
            catch (Exception ex)
            {
                Console.WriteLine(server + " " + ex.Message + " " + ex.GetBaseException());
                
            }

            // Loop through the AddressList to obtain the supported AddressFamily. This is to avoid 
            // an exception that occurs when the host IP Address is not compatible with the address family 
            // (typical in the IPv6 case). 
            foreach (IPAddress address in hostEntry.AddressList)
            {
                IPEndPoint ipe = new IPEndPoint(address, port);
                Socket tempSocket =
                    new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

                tempSocket.Connect(ipe);

                if (tempSocket.Connected)
                {
                    s = tempSocket;
                    break;
                }
                else
                {
                    continue;
                }
            }
            return s;
        }

        // This method requests the home page content for the specified server. 
        private static string SocketSendReceive(string server, int port)
        {
            string request = "GET / HTTP/1.1\r\nHost: " + server +
                "\r\nConnection: Close\r\n\r\n";
            Byte[] bytesSent = Encoding.ASCII.GetBytes(request);
            Byte[] bytesReceived = new Byte[256];

            // Create a socket connection with the specified server and port.
            Socket s = ConnectSocket(server, port);

            if (s == null)
                return ("Connection failed");

            // Send request to the server.
            s.Send(bytesSent, bytesSent.Length, 0);

            // Receive the server home page content. 
            int bytes = 0;
            string page = "Default HTML page on " + server + ":\r\n";

            // The following will block until te page is transmitted. 
            do
            {
                bytes = s.Receive(bytesReceived, bytesReceived.Length, 0);
                page = page + Encoding.ASCII.GetString(bytesReceived, 0, bytes);
            }
            while (bytes > 0);

            return page;
        }

        public static void Main(string[] args)
        {
            string host;
            int port = 80;

            if (args.Length == 0)
            {
                // If no server name is passed as argument to this program,  
                // use the current host name as the default.
                //host = Dns.GetHostByName(""); //Dns.GetHostName();
                IPAddress[] ips = Dns.GetHostAddresses("google.com"); //Dns.GetHostName());

                //Console.WriteLine("ip=" + ips[0].ToString());

                IPHostEntry iphost = Dns.GetHostEntry(ips[0]);
                host = iphost.HostName.Trim();
            }
            else
                host = args[0];

            string result = SocketSendReceive(host, port);
            Console.WriteLine(result);
            Console.ReadKey();
        }
    }
}