public override void Bad()
{
if (true)
{
TcpListener listener = null;
TcpClient tcpConn = null;
Stream streamOutput = null;
int port = 20000;
try
{
listener = new TcpListener(IPAddress.Parse("10.10.1.10"), port);
listener.Start();
tcpConn = listener.AcceptTcpClient(); /* INCIDENTAL: Use of Socket */
/* FLAW: IP-based Logic */
IPEndPoint endPoint = (IPEndPoint)tcpConn.Client.RemoteEndPoint;
IPAddress ipAddress = endPoint.Address;
IPHostEntry hostEntry = Dns.GetHostEntry(ipAddress);
if (hostEntry.Equals("192.168.30.123"))
{
streamOutput = tcpConn.GetStream();
streamOutput.Write(Encoding.UTF8.GetBytes("Welcome, admin!"), 0, "Welcome, admin!".Length);
}
else
{
streamOutput = tcpConn.GetStream();
streamOutput.Write(Encoding.UTF8.GetBytes("Welcome, user."), 0, "Welcome, user.".Length);
}
}
catch (IOException exceptIO)
{
IO.Logger.Log(NLog.LogLevel.Warn, exceptIO, "Could not connect to port " + port.ToString());
}
finally
{
try
{
if (streamOutput != null)
{
streamOutput.Close();
}
}
catch (IOException exceptIO)
{
IO.Logger.Log(NLog.LogLevel.Warn, exceptIO, "Error closing objects");
}
try
{
if (tcpConn != null)
{
tcpConn.Close();
}
}
catch (IOException exceptIO)
{
IO.Logger.Log(NLog.LogLevel.Warn, exceptIO, "Error closing objects");
}
try
{
if (listener != null)
{
listener.Stop();
}
}
catch (IOException exceptIO)
{
IO.Logger.Log(NLog.LogLevel.Warn, exceptIO, "Error closing objects");
}
}
}
}
