program.cs

// A C# Program for Server 
using System;
using System.Net;
using System.Net.Sockets;
using System.Reflection.Metadata;
using System.Text;

namespace AC_Simulator_Server
{

    class Program
    {

        // Main Method 
        static void Main(string[] args)
        {
            ExecuteServer();
        }

        public static void ExecuteServer()
        {
            string[] id = new string[999];
            string[] user = new string[999];
            string[] pass = new string[999];
            string[] userBells = new string[999];
            string[] userTurnips = new string[999];
            int licznik = 1;
            // Establish the local endpoint  
            // for the socket. Dns.GetHostName 
            // returns the name of the host  
            // running the application. 
            IPHostEntry ipHost = Dns.GetHostEntry(Dns.GetHostName());
            IPAddress ipAddr = ipHost.AddressList[0];
            IPEndPoint localEndPoint = new IPEndPoint(ipAddr, 11111);

            // Creation TCP/IP Socket using  
            // Socket Class Costructor 
            Socket listener = new Socket(ipAddr.AddressFamily,
                         SocketType.Stream, ProtocolType.Tcp);

            try
            {

                // Using Bind() method we associate a 
                // network address to the Server Socket 
                // All client that will connect to this  
                // Server Socket must know this network 
                // Address 
                listener.Bind(localEndPoint);

                // Using Listen() method we create  
                // the Client list that will want 
                // to connect to Server 
                listener.Listen(1);

                while (true)
                {

                    Console.WriteLine("Waiting connection ... ");

                    // Suspend while waiting for 
                    // incoming connection Using  
                    // Accept() method the server  
                    // will accept connection of client 
                    Socket clientSocket = listener.Accept();

                    // Data buffer 
                    byte[] bytes = new Byte[1024];
                    string data = null;

                    int numByte = clientSocket.Receive(bytes);

                    data += Encoding.ASCII.GetString(bytes, 0, numByte);

                    if (data == "REG")
                    {
                        Console.WriteLine("NEW REGISTER: ", data);
                        byte[] message = Encoding.ASCII.GetBytes("OK REG");
                        clientSocket.Send(message);

                        byte[] bytesReg1 = new Byte[1024];
                        string dataReg1 = null;

                        int numByteReg1 = clientSocket.Receive(bytesReg1);

                        dataReg1 += Encoding.ASCII.GetString(bytesReg1, 0, numByteReg1);
                        licznik++;
                        id[licznik] = licznik.ToString();
                        user[licznik] = dataReg1;
                        Console.WriteLine("ID: ", licznik);
                        Console.WriteLine("User: ", dataReg1);
                        byte[] messageReg1 = Encoding.ASCII.GetBytes("OK REG1");
                        clientSocket.Send(messageReg1);

                        byte[] bytesReg2 = new Byte[1024];
                        string dataReg2 = null;

                        int numByteReg2 = clientSocket.Receive(bytesReg2);

                        dataReg2 += Encoding.ASCII.GetString(bytesReg2, 0, numByteReg2);
                        pass[licznik] = dataReg2;
                        Console.WriteLine("Pass: ", dataReg2);
                        byte[] messageReg2 = Encoding.ASCII.GetBytes("OK REG2");
                        clientSocket.Send(messageReg2);

                        byte[] messageReg3 = Encoding.ASCII.GetBytes(licznik.ToString());
                        clientSocket.Send(messageReg3);

                        byte[] bytesReg3 = new Byte[1024];
                        string dataReg3 = null;

                        int numByteReg3 = clientSocket.Receive(bytesReg3);

                        dataReg3 += Encoding.ASCII.GetString(bytesReg3, 0, numByteReg3);
                        if (data.IndexOf("REG END SUCC") > -1)
                        {
                            Console.WriteLine("REGISTRATION ENDED SUCCESFULLY: ", data);
                        }
                    }

                    // Close client Socket using the 
                    // Close() method. After closing, 
                    // we can use the closed Socket  
                    // for a new Client Connection 
                    clientSocket.Shutdown(SocketShutdown.Both);
                    clientSocket.Close();
                }
            }

            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }
    }
}