public void sendCommand(string dataToSend, string howToEncrypt)
{
server = client.GetStream();
dataToSend = encryptionClass.Encrypt(dataToSend, howToEncrypt);
byte[] outStream = System.Text.Encoding.ASCII.GetBytes(dataToSend + "$");
server.Write(outStream, 0, (int)outStream.Length);
server.Flush();
}
private void checkClient()
{
canConnect = false;
isConnected = false;
closeCommand = false;
ipToBlock.Clear();
malwareToBlock.Clear();
ipWhichTriedToConnect.Clear();
mainWindowClass.statusControl.Dispatcher.Invoke(new Action(() => mainWindowClass.statusControl.Content = "Status : waiting for user"));
while (!canConnect)
{
client = server.AcceptTcpClient();
bool okIp = true;
string clientIp = ((IPEndPoint)client.Client.RemoteEndPoint).Address.ToString();
foreach (string ip in malwareToBlock)
{
if (ip == clientIp)
{
okIp = false;
client.Close();
}
}
foreach (string ip in ipToBlock)
{
if (ip == clientIp)
{
networkStream = client.GetStream();
string serverResponse = encryptionClass.Encrypt("Max reached", "1s 1t 0k %!1,5") + "$";
Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);
networkStream.Write(sendBytes, 0, sendBytes.Length);
networkStream.Flush();
okIp = false;
client.Close();
}
}
if (okIp)
{
try
{
networkStream = client.GetStream();
string serverResponse = encryptionClass.Encrypt("NothingWrong", "1s 1t 0k %!1,5") + "$";
Byte[] sendBytes = Encoding.ASCII.GetBytes(serverResponse);
networkStream.Write(sendBytes, 0, sendBytes.Length);
networkStream.Flush();
networkStream = client.GetStream();
byte[] byteFrom = new byte[100250];
networkStream.Read(byteFrom, 0, (int)client.ReceiveBufferSize);
string dataFromClient = System.Text.Encoding.ASCII.GetString(byteFrom);
dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));
dataFromClient = encryptionClass.Decrypt(dataFromClient, "Th15 p@55w0r4 w111 b3 r3c31v3d %!1");
if (dataFromClient == "FailedToDecrypt")
{
malwareToBlock.Add(clientIp);
mainWindowClass.failedToDecryptAtPassCheckServer();
}
else if (dataFromClient == mainWindowClass.serverPassword)
{
isConnected = true;
canConnect = true;
for (int i = 0; i < ipWhichTriedToConnect.Count; i++)
{
if (ipWhichTriedToConnect[i] == clientIp)
{
passwordTriedPerIpTries[i] = 0;
}
}
mainWindowClass.notification("Somebody has connected to your computer !");
networkStream = client.GetStream();
serverResponse = encryptionClass.Encrypt("YouShallPassqwerty", "Th15 1s th3 r3sp0ns3 %!2") + "$";
sendBytes = Encoding.ASCII.GetBytes(serverResponse);
networkStream.Write(sendBytes, 0, sendBytes.Length);
networkStream.Flush();
mainWindowClass.statusControl.Dispatcher.Invoke(new Action(() => mainWindowClass.statusControl.Content = "Status : online"));
mainWindowClass.chatAvalible = true;
mainWindowClass.activateChat();
}
else
{
bool found = false;
int whichOne = 0;
for (int i = 0; i < ipWhichTriedToConnect.Count; i++)
{
if (ipWhichTriedToConnect[i] == clientIp)
{
found = true;
passwordTriedPerIpTries[i]++;
whichOne = passwordTriedPerIpTries[i];
if (passwordTriedPerIpTries[i] == 3)
{
ipToBlock.Add(ipWhichTriedToConnect[i]);
}
}
}
if (!found)
{
ipWhichTriedToConnect.Add(clientIp);
passwordTriedPerIpTries.Add(1);
whichOne = passwordTriedPerIpTries[passwordTriedPerIpTries.Count - 1];
}
networkStream = client.GetStream();
serverResponse = encryptionClass.Encrypt("YouShallNotPass" + (4 - whichOne).ToString(), "Th15 1s th3 r3sp0ns3 %!2") + "$";
sendBytes = Encoding.ASCII.GetBytes(serverResponse);
networkStream.Write(sendBytes, 0, sendBytes.Length);
networkStream.Flush();
}
if (!canConnect)
{
client.Close();
}
}
catch (Exception)
{
//MessageBox.Show(ex.ToString());
}
}
}
}