Java tutorial
/* * * Copyright (C) 2011, 2015 Cisco Systems, Inc. * Copyright (C) 2015 CBA research group, Technical University of Catalonia. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ package org.lispmob.root; import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.ScheduledFuture; import java.util.concurrent.TimeUnit; import android.app.Notification; import android.app.PendingIntent; import android.app.Service; import android.content.Intent; import android.content.pm.PackageManager.NameNotFoundException; import android.os.IBinder; import android.support.v4.app.NotificationCompat; import android.util.Log; public class LISPmobService extends Service implements Runnable { private static String TAG = "LISPmob DNS service"; private static SuShell shell = null; private static String system_dns[] = new String[2]; private static String lispmob_dns[] = new String[2]; private static boolean start = false; public static boolean isRunning = false; private static Thread thread = null; private static ScheduledExecutorService scheduler = null; private static ScheduledFuture<?> scheduledFuture = null; private static String prefix = null; private static String lispd_path = null; @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { try { shell = new SuShell(); } catch (IOException e1) { } prefix = getPackageName(); try { lispd_path = getPackageManager().getApplicationInfo("org.lispmob.root", 0).nativeLibraryDir; } catch (NameNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } if (intent != null) { start = intent.getBooleanExtra(prefix + ".START", true); } else { Log.i(TAG, "LISPmob service stopped and it has been reestarted"); start = true; } if (start == true) { if (thread != null) { Log.i(TAG, "LISPmob Service already running"); try { lispmob_dns = ConfigTools.getDNS(); } catch (FileNotFoundException e) { e.printStackTrace(); return START_NOT_STICKY; } } else { Log.i(TAG, "Starting LISPmob Service."); system_dns = get_dns_servers(); try { lispmob_dns = ConfigTools.getDNS(); } catch (FileNotFoundException e) { e.printStackTrace(); return START_NOT_STICKY; } thread = new Thread(this, "LISPmobService"); thread.start(); /* Put the service in background mode */ Intent mainIntent = new Intent(this, LISPmob.class); NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext()); builder.setContentTitle("LISPmob"); builder.setContentText("LISPmob running"); builder.setContentIntent( PendingIntent.getActivity(this, PendingIntent.FLAG_UPDATE_CURRENT, mainIntent, 0)); Notification notif = builder.build(); startForeground(1234, notif); } } else { this.onDestroy(); } if (start == true) { return (START_STICKY); } else { return (START_NOT_STICKY); } } @Override public void onDestroy() { Log.d(TAG, "Destroying LISPmob DNS Service thread"); scheduledFuture.cancel(true); scheduler.shutdown(); set_dns_servers(system_dns); if (thread != null) { thread.interrupt(); thread = null; } stopForeground(true); } public synchronized void run() { scheduler = Executors.newScheduledThreadPool(1); Runnable dnsCheck = new Runnable() { public void run() { String psOutput = runTask("/system/bin/ps", "", false); isRunning = psOutput.matches("(?s)(.*)[RS]\\s[a-zA-Z0-9\\/\\.\\-]*liblispd\\.so(.*)"); if (isRunning && lispmob_dns != null) { String dns[] = get_dns_servers(); if (!dns[0].equals(lispmob_dns[0]) || !dns[1].equals(lispmob_dns[1])) { system_dns = get_dns_servers(); set_dns_servers(lispmob_dns); } } if (isRunning == false) { onDestroy(); } } }; scheduledFuture = scheduler.scheduleAtFixedRate(dnsCheck, 0, 1, TimeUnit.SECONDS); } public String[] get_dns_servers() { String command = null; String dns[] = new String[2]; command = "getprop net.dns1"; dns[0] = shell.run(command); command = "getprop net.dns2"; dns[1] = shell.run(command); return dns; } public static void set_dns_servers(String[] dns) { String command = null; command = "setprop net.dns1 \"" + dns[0] + "\""; shell.run_no_output(command); command = "setprop net.dns2 \"" + dns[1] + "\""; shell.run_no_output(command); } static public String runTask(String command, String args, boolean ignoreOutput) { StringBuffer output = new StringBuffer(); Process process = null; try { process = new ProcessBuilder().command(command, args).redirectErrorStream(true).start(); InputStream in = process.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); String line; process.waitFor(); if (!ignoreOutput) { while ((line = reader.readLine()) != null) { output.append(line); output.append('\n'); } } } catch (IOException e1) { System.out.println("LISPmob: Command Failed."); e1.printStackTrace(); return ("Command Failed."); } catch (InterruptedException e) { e.printStackTrace(); } return (output.toString()); } }