hostage/src/de/tudarmstadt/informatik/hostage/ConnectionGuard.java

package de.tudarmstadt.informatik.hostage;

import android.util.Log;

public class ConnectionGuard {

	private final static ConnectionGuard INSTANCE = new ConnectionGuard();

	private ConnectionGuard() {
	}

	private final static long ONE_SECOND_IN_NANOSECONDS = 1000000000;

	private static long lastTimestamp = 0;

	public static void registerConnection() {
		long timestamp = System.nanoTime();
		boolean firstConnection = (lastTimestamp == 0);
		boolean belowThreshold = ((timestamp - lastTimestamp) < ONE_SECOND_IN_NANOSECONDS);
		if (!firstConnection && belowThreshold) {
			Log.d("ConnectionGuard", "PORTSCAN DETECTED");
		}
		lastTimestamp = timestamp;
	}
}