consolidate all repos to one for archive
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265
semester_3/racunalniska_omrezja/naloga_2/Streznik/Server.cs
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265
semester_3/racunalniska_omrezja/naloga_2/Streznik/Server.cs
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using System;
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using System.Net;
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using System.Net.Sockets;
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using System.Security.Cryptography;
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using System.Text;
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namespace Server
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{
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class Program
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{
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const int STD_PORT = 1234;
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const string STD_IP = "127.0.0.1";
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const int STD_MSG_SIZE = 1024;
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const int STD_HEAD_LEN = 1;
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const string STD_CRYPTOKEY = "mojKluc";
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static bool run = true;
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static string Recive(NetworkStream networkStream)
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{
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try
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{
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byte[] reciveMessage = new byte[STD_MSG_SIZE];
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int lenght = networkStream.Read(reciveMessage, 0, reciveMessage.Length);
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return Encoding.UTF8.GetString(reciveMessage, 0, lenght);
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}
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catch (Exception e)
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{
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Console.WriteLine(e.Message + e.StackTrace);
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return "";
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}
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}
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static void Send(NetworkStream networkStream, string Message)
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{
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try
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{
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byte[] bytes = Encoding.UTF8.GetBytes(Message);
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networkStream.Write(bytes, 0, bytes.Length);
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}
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catch (Exception e)
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{
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Console.WriteLine(e.Message);
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}
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}
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static string Encrypt(string source, string key)
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{
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try
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{
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using (var hashMD5Provider = new MD5CryptoServiceProvider())
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{
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using var tripleDes = TripleDES.Create();
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tripleDes.Mode = CipherMode.ECB;
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tripleDes.Padding = PaddingMode.PKCS7;
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tripleDes.Key = hashMD5Provider.ComputeHash(Encoding.UTF8.GetBytes(key));
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byte[] data = Encoding.Unicode.GetBytes(source);
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return Convert.ToBase64String(tripleDes.CreateEncryptor().TransformFinalBlock(data, 0, data.Length));
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}
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/*
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using (var tripleDESCryptoService = new TripleDESCryptoServiceProvider())
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{
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using (var hashMD5Provider = new MD5CryptoServiceProvider())
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{
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byte[] byteHash = hashMD5Provider.ComputeHash(Encoding.UTF8.GetBytes(key));
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tripleDESCryptoService.Key = byteHash;
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tripleDESCryptoService.Mode = CipherMode.ECB;
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byte[] data = Encoding.Unicode.GetBytes(source);
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var encryptor = tripleDESCryptoService.CreateEncryptor();
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return Convert.ToBase64String(encryptor.TransformFinalBlock(data, 0, data.Length));
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}
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}
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*/
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}
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catch (Exception e)
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{
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Console.WriteLine(e.ToString());
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return "";
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}
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}
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static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
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{
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// Check arguments.
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if (plainText == null || plainText.Length <= 0)
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throw new ArgumentNullException("plainText");
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if (Key == null || Key.Length <= 0)
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throw new ArgumentNullException("Key");
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if (IV == null || IV.Length <= 0)
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throw new ArgumentNullException("IV");
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byte[] encrypted;
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// Create an Rijndael object
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// with the specified key and IV.
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using (Rijndael rijAlg = Rijndael.Create())
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{
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rijAlg.Key = Key;
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rijAlg.IV = IV;
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// Create an encryptor to perform the stream transform.
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ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
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// Create the streams used for encryption.
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using (MemoryStream msEncrypt = new MemoryStream())
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{
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using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
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{
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using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
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{
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//Write all data to the stream.
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swEncrypt.Write(plainText);
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}
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encrypted = msEncrypt.ToArray();
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}
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}
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}
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// Return the encrypted bytes from the memory stream.
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return encrypted;
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}
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static string FEN(string code)
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{
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try
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{
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// rnbqkbnr/pppppppp/2p2p2/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
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string ret = "";
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string[] strings = code.Split(' ');
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string[] board = strings[0].Split('/');
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foreach (var line in board)
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{
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foreach (var sq in line)
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{
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if (Char.IsNumber(sq)){
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int spaces = sq - '0';
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for (int j = 0; j < spaces; j++) ret += " ";
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}
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else
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{
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ret += sq;
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}
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}
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ret += "\n";
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}
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ret += "\nNa vrsti je: " + (strings[1] == "w" ? "beli" : "crni") + "\n\n";
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ret += "Moznosti rokade: \n";
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foreach(var m in strings[2])
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{
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switch (m)
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{
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case 'K':
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ret += "beli, kraljeva stran\n";
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break;
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case 'Q':
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ret += "beli, kraljiceva stran\n";
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break;
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case 'k':
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ret += "crni, kraljeva stran\n";
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break;
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case 'q':
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ret += "crni, kraljiceva stran\n";
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break;
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case '-':
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ret += "Ni moznosti\n";
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break;
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}
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}
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ret += "\nMoznosti en pasant: " + (strings[3] == "-" ? "ni moznosti" : strings[3]) + "\n";
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ret += "stevilo polpotez: " + strings[4] + "\n";
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ret += "stevilo poltez: " + strings[5] + "\n";
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return ret;
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}
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catch (Exception e)
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{
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Console.WriteLine(e.ToString());
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return "";
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}
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}
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static void Main(string[] args)
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{
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Console.WriteLine("Server\n");
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TcpListener listener = new TcpListener(IPAddress.Parse(STD_IP), STD_PORT);
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listener.Start();
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while (run)
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{
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TcpClient client = listener.AcceptTcpClient();
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NetworkStream networkStream = client.GetStream();
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Console.WriteLine("Odjemalec: " + client.Client.RemoteEndPoint.ToString());
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string message = Recive(networkStream);
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Console.WriteLine("Prejel: " + message);
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char head = message[0];
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string body = "";
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if (message.Length > 1)
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{
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body = message[1..];
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}
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string response = "";
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switch (head)
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{
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case 'A':
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response = "Pozdravljen " + client.Client.RemoteEndPoint.ToString();
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break;
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case 'B':
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response = DateTime.Now.ToString("dd/MM/yyyy HH:mm");
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break;
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case 'C':
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response = Environment.CurrentDirectory;
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break;
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case 'D':
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response = body;
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break;
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case 'E':
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response = Environment.MachineName + " " + Environment.OSVersion.ToString();
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break;
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case 'F':
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response = FEN(body);
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break;
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case 'G':
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response = Encrypt(body, STD_CRYPTOKEY);
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break;
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case 'Q':
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response = "Q";
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run = false;
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break;
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}
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if(response == "") response = "No Response";
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Console.WriteLine("Odgovor:\n" + response + "\n");
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Send(networkStream, response);
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}
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listener.Stop();
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}
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}
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}
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@@ -0,0 +1,10 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>
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