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- package de.tudarmstadt.informatik.hostage.net;
- import java.io.FileDescriptor;
- import java.io.IOException;
- import java.lang.reflect.Field;
- import java.net.DatagramSocket;
- import java.net.DatagramSocketImpl;
- import de.tudarmstadt.informatik.hostage.system.Device;
- import de.tudarmstadt.informatik.hostage.system.PrivilegedPort;
- import de.tudarmstadt.informatik.hostage.system.PrivilegedPort.TYPE;
- public class MyDatagramSocketFactory {
- public DatagramSocket createDatagramSocket(int port) throws IOException {
- DatagramSocket socket = null;
- if (port > 1023) {
- socket = new DatagramSocket(port);
- } else if (Device.isPorthackInstalled()) {
- FileDescriptor fd = new PrivilegedPort(TYPE.UDP, port).getFD();
- socket = new DatagramSocket();
- try {
- DatagramSocketImpl impl = getImpl(socket);
- injectFD(fd, impl);
- setBound(socket);
- } catch (NoSuchFieldException e) {
- } catch (IllegalAccessException e) {
- } catch (IllegalArgumentException e) {
- }
- }
- return socket;
- }
- private DatagramSocketImpl getImpl(DatagramSocket socket) throws NoSuchFieldException, IllegalAccessException, IllegalArgumentException {
- Field implField = socket.getClass().getDeclaredField("impl");
- implField.setAccessible(true);
- return (DatagramSocketImpl) implField.get(socket);
- }
- private void injectFD(FileDescriptor fd, DatagramSocketImpl impl) throws NoSuchFieldException, IllegalAccessException, IllegalArgumentException {
- Class<?> plainDatagramSocketImplClazz = impl.getClass();
- Class<?> datagramSocketImplClazz = plainDatagramSocketImplClazz.getSuperclass();
- Field fdField = datagramSocketImplClazz.getDeclaredField("fd");
- fdField.setAccessible(true);
- fdField.set(impl, fd);
- }
- private void setBound(DatagramSocket socket) throws NoSuchFieldException, IllegalAccessException, IllegalArgumentException {
- Field boundField = socket.getClass().getDeclaredField("isBound");
- boundField.setAccessible(true);
- boundField.set(socket, true);
- }
- }
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