hostage/src/de/tudarmstadt/informatik/hostage/system/Device.java

package de.tudarmstadt.informatik.hostage.system;

import java.io.IOException;

import android.util.Log;

import de.tudarmstadt.informatik.hostage.commons.HelperUtils;


public class Device {
	private static String porthackFilepath = "/data/local/bind";
	private static boolean initialized = false;
	private static boolean root = false; // device is rooted
	private static boolean porthack = false; // porthack installed
	private static boolean iptables = false; // iptables redirection confirmed working

    public static void checkCapabilities() {
		// assume worst case
		initialized = false;
		root = false;
		porthack = false;
		iptables = false;

		porthackFilepath = HelperUtils.getPorthackFilepath();
		String porthackExists = "[ -e "+porthackFilepath+" ]"; // checks existence of porthack

		try {
			Process p = new ProcessBuilder("su", "-c", porthackExists).start();
			switch (p.waitFor()) {
			case 0: porthack = true;
			// fall through and don't break
			case 1: root = true; // 0 and 1 are valid return values of the porthack
				break;

			case 127: // command not found or executable
				root = false;
				porthack = false;
				break;
			}
		} catch (IOException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}

		final String ipTablesList = "iptables -L -n -t nat"; // list all rules in NAT table
		try {
			Process p = new ProcessBuilder("su", "-c", ipTablesList).start();
			switch (p.waitFor()) {
				case 0: // everything is fine
					iptables = true; // iptables available and working
					break;

				case 3: // no such table
				case 127: // command not found
				default: // unexpected return code
					// while testing code 3 has been returned when table NAT is not available
					iptables = false;
			}
		} catch (IOException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}

		initialized = true;
	}

	public static boolean isRooted() {
		assert(initialized);
		return root;
	}

	public static boolean isPorthackInstalled() {
		assert(initialized);
		return porthack;
	}

	public static boolean isPortRedirectionAvailable() { // using iptables
		assert(initialized);
		return iptables;
	}
}