using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace MasterServerQuery
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                var EP = new IPEndPoint(IPAddress.Any, 0);
                var getservers = Encoding.UTF8.GetBytes("    getservers IW4 142 all");
                for (int i = 0; i < 4; i++)
                    getservers[i] = 0xFF;

                UdpClient client = new UdpClient("server.alteriw.net", 20810);
                while (true)
                {
                    client.Send(getservers, getservers.Length);
                    var receivedata = client.Receive(ref EP);
                    if (EP.Address.ToString() == "94.23.19.48")
                    {
                        Console.Write(Encoding.UTF8.GetString(receivedata));
                        parseResponse(receivedata);
                        if (Encoding.UTF8.GetString(receivedata).Contains("EOT"))
                            break;
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
            Console.ReadLine();
        }

        static void parseResponse(byte[] data)
        {
            var strData = Encoding.UTF7.GetString(data).Substring(4).Split('\\');
            for (int i = 0; i < strData.Length; i++)
            {
                if (strData[i].Contains("serverresponse"))
                    continue;
                else if (strData[i].Contains("EOT"))
                    break;
                else
                {
                    var ip = new int[6];
                    var port = 0;
                    if (strData[i] != "")
                    {
                        if (strData[i].Length == 6)
                        {
                            for(int h = 0; h < strData[i].Length; h++)
                                ip[h] = (int)strData[i][h];
                            port = (256 * ip[4] + ip[5]);
                            Console.WriteLine("{0}.{1}.{2}.{3}:{4}", ip[0], ip[1], ip[2], ip[3], port);
                        }
                    }
                    if (strData[i] == "")
                        strData[i + 1] = "\\" + strData[i + 1];
                }
            }
        }
    }
}