package com.stealthcopter.networktools.portscanning;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketTimeoutException;
/**
* Created by mat on 13/12/15.
*/
public class PortScanUDP {
// This class is not to be instantiated
private PortScanUDP() {
}
/**
* Check if a port is open with UDP, note that this isn't reliable
* as UDP will does not send ACKs
*
* @param ia - address to scan
* @param portNo - port to scan
* @param timeoutMillis - timeout
* @return - true if port is open, false if not or unknown
*/
public static boolean scanAddress(InetAddress ia, int portNo, int timeoutMillis) {
try {
byte[] bytes = new byte[128];
DatagramPacket dp = new DatagramPacket(bytes, bytes.length);
DatagramSocket ds = new DatagramSocket();
ds.setSoTimeout(timeoutMillis);
ds.connect(ia, portNo);
ds.send(dp);
ds.isConnected();
ds.receive(dp);
ds.close();
} catch (SocketTimeoutException e) {
return true;
} catch (Exception ignore) {
}
return false;
}
}
