/// <summary>
/// metoda obs³uguj¹ca asynchroniczne przy³¹czanie klientów
/// </summary>
/// <param name="result"></param>
private void HandleAsyncConnection(IAsyncResult result)
{
try
{
// Akceptuj po³¹czenia
TcpListener listener = (TcpListener)result.AsyncState;
TcpClient client = listener.EndAcceptTcpClient(result);
connectionWaitHandle.Set();
Cryptography crypt = new Cryptography();
AesManaged myAes = new AesManaged();
String AESKey = "SuperTajnyKlucz1"; //128 bit
myAes.Key = Encoding.UTF8.GetBytes(AESKey);
String AESIV = "SuperTajnyWektor"; //128 bit
myAes.IV = Encoding.UTF8.GetBytes(AESIV);
// Po³¹czenie zaakceptowane
Guid clientId = Guid.NewGuid();
Trace.WriteLine("Accepted connection with ID " + clientId.ToString(), "Information");
// Stwórz strumienie
NetworkStream netStream = client.GetStream();
StreamReader reader = new StreamReader(netStream);
StreamWriter writer = new StreamWriter(netStream);
writer.AutoFlush = true;
//writer.WriteLine("Who are you?");
String clientType = reader.ReadLine();
// Gdy pod³¹czono loggera
if (clientType == "logger")
{
LoggerReader = reader;
LoggerWriter = writer;
LoggerWriter.WriteLine("Hello, Logger!\n\rPlease wait for incoming connections");
if (loggerList.Count != 0)
{
LoggerWriter.WriteLine("There are some incoming logs");
foreach (string s in loggerList)
{
LoggerWriter.WriteLine(s);
}
loggerList = new List<string>();
}
while (true)
{
try
{
String msg = LoggerReader.ReadLine();
if (msg == "quit")
{
LoggerReader = null;
LoggerWriter = null;
client.Close();
break;
}
}
catch
{
client.Close();
}
}
}
// Gdy pod³¹czono klienta
else if (clientType == "client")
{
// losuj klucz szyfru cezara
Random rnd = new Random();
String key = string.Empty;
String decryptedKey = string.Empty;
String plainText = string.Empty;
// writer.WriteLine("Key: ");
// writer.WriteLine(ckey);
// writer.WriteLine("Welcome to RC4 Encrypting Server!");
while (true)
{
try
{
// writer.WriteLine("If you want to encrypt text, enter \"run\", if you want to quit, enter \"quit\"");
String command = reader.ReadLine();
if (command == "run")
{
// writer.WriteLine("Please Enter Key:");
key = reader.ReadLine();
//byte[] keyAESBytes = Encoding.UTF8.GetBytes(key);
byte[] keyAESBytes = crypt.StringToByteArray(key);
// odszyfruj klucz
decryptedKey = crypt.DecryptStringFromBytes_Aes(keyAESBytes, myAes.Key, myAes.IV);
// writer.WriteLine("Please Enter Plain Text:");
string isHexStr = reader.ReadLine();
bool isHex = (isHexStr == "hex") ? true : false;
plainText = reader.ReadLine();
Console.WriteLine("Key received : {0}", decryptedKey);
Console.WriteLine("Plain Text received : {0}", plainText);
byte[] keyBytes = Encoding.ASCII.GetBytes(decryptedKey);
byte[] textBytes;
if (!isHex) textBytes = Encoding.ASCII.GetBytes(plainText);
else textBytes = crypt.StringToByteArray(plainText);
Byte[] output = crypt.runRC4(keyBytes, textBytes);
// wynik szyfrowania w postaci heksadecymalnej
String outputString = crypt.ByteArrayToString(output);
// wynik szyfrowania w postaci stringu utf8
String outputStringUTF8 = Encoding.UTF8.GetString(output);
Byte[] decrypt = crypt.runRC4(keyBytes, output);
String decryptString = Encoding.ASCII.GetString(decrypt);
String decryptStringHex = crypt.ByteArrayToString(decrypt);
// wyœlij wynik do loggera
String msg;
if (!isHex) msg = "From Client : " + clientId.ToString() + "\n\rKey : " + decryptedKey + "\n\rPlain Text : " + plainText + "\n\rResult as hex string : \n\r"
+ outputString + "\n\rDecrypt result : " + decryptString + "\n\r";
else msg = "From Client : " + clientId.ToString() + "\n\rKey : " + decryptedKey + "\n\rHex string : " + plainText + "\n\rResult as utf8 string : \n\r"
+ outputStringUTF8 + "\n\rDecrypt hex result : " + decryptStringHex + "\n\r";
if (LoggerWriter != null) LoggerWriter.Write(msg);
else loggerList.Add(msg);
}
if (command == "quit")
{
client.Close();
break;
}
}
catch
{
Console.WriteLine("Error while connecting to client");
client.Close();
}
}
}
else
{
client.Close();
}
}
catch
{
Console.WriteLine("Something went wrong");
}
}