Program.cs

using System;
using System.Net;

namespace TelnetServer
{
    class Program
    {
        private static Server s;

        static void Main(string[] args)
        {
            s = new Server(IPAddress.Any);
            s.ClientConnected       += clientConnected;
            s.ClientDisconnected    += clientDisconnected;
            s.ConnectionBlocked     += connectionBlocked;
            s.MessageReceived       += messageReceived;
            s.start();

            Console.WriteLine("SERVER STARTED: " + DateTime.Now);

            char read = Console.ReadKey(true).KeyChar;

            do
            {
                if (read == 'b')
                {
                    s.sendMessageToAll(Console.ReadLine());
                }
            } while ((read = Console.ReadKey(true).KeyChar) != 'q');

            s.stop();
        }

        private static void clientConnected(Client c)
        {
            Console.WriteLine("CONNECTED: " + c);

            s.sendMessageToClient(c, "Telnet Server" + Server.END_LINE + "Login: ");
        }

        private static void clientDisconnected(Client c)
        {
            Console.WriteLine("DISCONNECTED: " + c);
        }

        private static void connectionBlocked(IPEndPoint ep)
        {
            Console.WriteLine(string.Format("BLOCKED: {0}:{1} at {2}", ep.Address, ep.Port, DateTime.Now));
        }

        private static void messageReceived(Client c, string message)
        {
            if (c.getCurrentStatus() != EClientStatus.LoggedIn)
            {
                handleLogin(c, message);
                return;
            }

            Console.WriteLine("MESSAGE: " + message);

            if (message == "kickmyass" || message == "logout" ||
                message == "exit")
            {
                s.kickClient(c);
                s.sendMessageToClient(c, Server.END_LINE + Server.CURSOR);
            }

            else if (message == "clear")
            {
                s.clearClientScreen(c);
                s.sendMessageToClient(c, Server.CURSOR);
            }

            else
                s.sendMessageToClient(c, Server.END_LINE + Server.CURSOR);
        }

        private static void handleLogin(Client c, string message)
        {
            EClientStatus status = c.getCurrentStatus();

            if (status == EClientStatus.Guest)
            {
                if (message == "root")
                {
                    s.sendMessageToClient(c, Server.END_LINE + "Password: ");
                    c.setStatus(EClientStatus.Authenticating);
                }

                else
                    s.kickClient(c);
            }

            else if (status == EClientStatus.Authenticating)
            {
                if (message == "r00t")
                {
                    s.clearClientScreen(c);
                    s.sendMessageToClient(c, "Successfully authenticated." + Server.END_LINE + Server.CURSOR);
                    c.setStatus(EClientStatus.LoggedIn);
                }

                else
                    s.kickClient(c);
            }
        }
    }
}