/*******************************************************************************
* Copyright (c) 2001, 2010 Mathew A. Nelson and Robocode contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://robocode.sourceforge.net/license/epl-v10.html
*
* Contributors:
* Flemming N. Larsen
* - Initial implementation
*******************************************************************************/
package tested.robots;
import robocode.*;
/**
* This nasty robot tries to interrupt the thread of each opponent robot that it scans.
* It enumerates the threads recursively of thread group that is a parent of its own
* thread group to find out, which threads that are active. These threads are all robot
* threads.
*
* This robot is inspired by the hacker.Destroyer 1.3, which proved a security breach in
* Robocode 1.7.2.1 Beta. The security breach was reported with:
* Bug [3021140] Possible for robot to kill other robot threads.
*
* The security manager of Robocode must make sure that unsafe (robot) threads cannot
* access thread groups other than its own thread group within checkAccess(Thread).
*
* @author Flemming N. Larsen (original)
*/
public class ThreadGroupAttack extends Robot {
private Thread[] threads = new Thread[100];
public void run() {
runAttack();
while (true) {
turnGunLeft(30);
}
}
private void runAttack() {
try {
new Thread(new Runnable() {
public void run() {
ThreadGroup parentGroup = Thread.currentThread().getThreadGroup().getParent();
while (true) {
parentGroup.enumerate(threads, true);
try {
Thread.sleep(0);
} catch (InterruptedException ignore) {}
}
}
}).start();
} catch (Throwable t) {
t.printStackTrace(out);
}
}
public void onScannedRobot(ScannedRobotEvent e) {
attackRobotThread(e.getName());
}
private void attackRobotThread(String robotName) {
for (Thread t : threads) {
if (t != null && robotName.equals(t.getName())) {
t.interrupt();
out.println("Interrupted: " + robotName);
}
}
}
}