packages/VpnServices/src/com/android/server/vpn/VpnService.java - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2009, The Android Open Source Project
  *
  * 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 com.android.server.vpn;

 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.net.vpn.VpnManager;
 import android.net.vpn.VpnProfile;
 import android.net.vpn.VpnState;
 import android.os.SystemProperties;
 import android.text.TextUtils;
 import android.util.Log;

 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.List;

 /**
  * The service base class for managing a type of VPN connection.
  */
 abstract class VpnService<E extends VpnProfile> {
     private static final int NOTIFICATION_ID = 1;

     private static final String DNS1 = "net.dns1";
     private static final String DNS2 = "net.dns2";
     private static final String VPN_DNS1 = "vpn.dns1";
     private static final String VPN_DNS2 = "vpn.dns2";
     private static final String VPN_STATUS = "vpn.status";
     private static final String VPN_IS_UP = "ok";
     private static final String VPN_IS_DOWN = "down";

     private static final String REMOTE_IP = "net.ipremote";
     private static final String DNS_DOMAIN_SUFFICES = "net.dns.search";

     private static final int AUTH_ERROR_CODE = 51;

     private final String TAG = VpnService.class.getSimpleName();

     E mProfile;
     VpnServiceBinder mContext;

     private VpnState mState = VpnState.IDLE;
     private Throwable mError;

     // connection settings
     private String mOriginalDns1;
     private String mOriginalDns2;
     private String mVpnDns1 = "";
     private String mVpnDns2 = "";
     private String mOriginalDomainSuffices;

     private long mStartTime; // VPN connection start time

     // for helping managing multiple daemons
     private DaemonHelper mDaemonHelper = new DaemonHelper();

     // for helping showing, updating notification
     private NotificationHelper mNotification = new NotificationHelper();

     /**
      * Establishes a VPN connection with the specified username and password.
      */
     protected abstract void connect(String serverIp, String username,
             String password) throws IOException;

     /**
      * Starts a VPN daemon.
      */
     protected DaemonProxy startDaemon(String daemonName)
             throws IOException {
         return mDaemonHelper.startDaemon(daemonName);
     }

     /**
      * Returns the VPN profile associated with the connection.
      */
     protected E getProfile() {
         return mProfile;
     }

     /**
      * Returns the IP address of the specified host name.
      */
     protected String getIp(String hostName) throws IOException {
         return InetAddress.getByName(hostName).getHostAddress();
     }

     void setContext(VpnServiceBinder context, E profile) {
         mContext = context;
         mProfile = profile;
     }

     VpnState getState() {
         return mState;
     }

     synchronized boolean onConnect(String username, String password) {
         try {
             mState = VpnState.CONNECTING;
             broadcastConnectivity(VpnState.CONNECTING);

             String serverIp = getIp(getProfile().getServerName());

             onBeforeConnect();
             connect(serverIp, username, password);
             waitUntilConnectedOrTimedout();
             return true;
         } catch (Throwable e) {
             Log.e(TAG, "onConnect()", e);
             onError(e);
             return false;
         }
     }

     synchronized void onDisconnect() {
         try {
             Log.d(TAG, "       disconnecting VPN...");
             mState = VpnState.DISCONNECTING;
             broadcastConnectivity(VpnState.DISCONNECTING);
             mNotification.showDisconnect();

             mDaemonHelper.stopAll();
         } catch (Throwable e) {
             Log.e(TAG, "onDisconnect()", e);
         } finally {
             onFinalCleanUp();
         }
     }

     private void onError(Throwable error) {
         // error may occur during or after connection setup
         // and it may be due to one or all services gone
         if (mError != null) {
             Log.w(TAG, "   multiple errors occur, record the last one: "
                     + error);
         }
         mError = error;
         onDisconnect();
     }

     private void onError(int errorCode) {
         onError(new VpnConnectingError(errorCode));
     }


     private void onBeforeConnect() {
         mNotification.disableNotification();

         SystemProperties.set(VPN_DNS1, "-");
         SystemProperties.set(VPN_DNS2, "-");
         SystemProperties.set(VPN_STATUS, VPN_IS_DOWN);
         Log.d(TAG, "       VPN UP: " + SystemProperties.get(VPN_STATUS));
     }

     private void waitUntilConnectedOrTimedout() {
         sleep(2000); // 2 seconds
         for (int i = 0; i < 60; i++) {
             if (mState != VpnState.CONNECTING) {
                 break;
             } else if (VPN_IS_UP.equals(
                     SystemProperties.get(VPN_STATUS))) {
                 onConnected();
                 return;
             } else if (mDaemonHelper.anySocketError()) {
                 return;
             }
             sleep(500); // 0.5 second
         }

         synchronized (VpnService.this) {
             if (mState == VpnState.CONNECTING) {
                 Log.d(TAG, "       connecting timed out !!");
                 onError(new IOException("Connecting timed out"));
             }
         }
     }

     private synchronized void onConnected() {
         Log.d(TAG, "onConnected()");

         mDaemonHelper.closeSockets();
         saveVpnDnsProperties();
         saveAndSetDomainSuffices();

         mState = VpnState.CONNECTED;
         broadcastConnectivity(VpnState.CONNECTED);

         enterConnectivityLoop();
     }

     private synchronized void onFinalCleanUp() {
         Log.d(TAG, "onFinalCleanUp()");

         if (mState == VpnState.IDLE) return;

         // keep the notification when error occurs
         if (!anyError()) mNotification.disableNotification();

         restoreOriginalDnsProperties();
         restoreOriginalDomainSuffices();
         mState = VpnState.IDLE;
         broadcastConnectivity(VpnState.IDLE);

         // stop the service itself
         mContext.stopSelf();
     }

     private boolean anyError() {
         return (mError != null);
     }

     private void restoreOriginalDnsProperties() {
         // restore only if they are not overridden
         if (mVpnDns1.equals(SystemProperties.get(DNS1))) {
             Log.d(TAG, String.format("restore original dns prop: %s --> %s",
                     SystemProperties.get(DNS1), mOriginalDns1));
             Log.d(TAG, String.format("restore original dns prop: %s --> %s",
                     SystemProperties.get(DNS2), mOriginalDns2));
             SystemProperties.set(DNS1, mOriginalDns1);
             SystemProperties.set(DNS2, mOriginalDns2);
         }
     }

     private void saveVpnDnsProperties() {
         mOriginalDns1 = mOriginalDns2 = "";
         for (int i = 0; i < 5; i++) {
             mVpnDns1 = SystemProperties.get(VPN_DNS1);
             mVpnDns2 = SystemProperties.get(VPN_DNS2);
             if (mOriginalDns1.equals(mVpnDns1)) {
                 Log.d(TAG, "wait for vpn dns to settle in..." + i);
                 sleep(200);
             } else {
                 mOriginalDns1 = SystemProperties.get(DNS1);
                 mOriginalDns2 = SystemProperties.get(DNS2);
                 SystemProperties.set(DNS1, mVpnDns1);
                 SystemProperties.set(DNS2, mVpnDns2);
                 Log.d(TAG, String.format("save original dns prop: %s, %s",
                         mOriginalDns1, mOriginalDns2));
                 Log.d(TAG, String.format("set vpn dns prop: %s, %s",
                         mVpnDns1, mVpnDns2));
                 return;
             }
         }
         Log.d(TAG, "saveVpnDnsProperties(): DNS not updated??");
         mOriginalDns1 = mVpnDns1 = SystemProperties.get(DNS1);
         mOriginalDns2 = mVpnDns2 = SystemProperties.get(DNS2);
     }

     private void saveAndSetDomainSuffices() {
         mOriginalDomainSuffices = SystemProperties.get(DNS_DOMAIN_SUFFICES);
         Log.d(TAG, "save original dns search: " + mOriginalDomainSuffices);
         String list = mProfile.getDomainSuffices();
         if (!TextUtils.isEmpty(list)) {
             SystemProperties.set(DNS_DOMAIN_SUFFICES, list);
         }
     }

     private void restoreOriginalDomainSuffices() {
         Log.d(TAG, "restore original dns search --> " + mOriginalDomainSuffices);
         SystemProperties.set(DNS_DOMAIN_SUFFICES, mOriginalDomainSuffices);
     }

     private void broadcastConnectivity(VpnState s) {
         VpnManager m = new VpnManager(mContext);
         Throwable err = mError;
         if ((s == VpnState.IDLE) && (err != null)) {
             if (err instanceof UnknownHostException) {
                 m.broadcastConnectivity(mProfile.getName(), s,
                         VpnManager.VPN_ERROR_UNKNOWN_SERVER);
             } else if (err instanceof VpnConnectingError) {
                 m.broadcastConnectivity(mProfile.getName(), s,
                         ((VpnConnectingError) err).getErrorCode());
             } else {
                 m.broadcastConnectivity(mProfile.getName(), s,
                         VpnManager.VPN_ERROR_CONNECTION_FAILED);
             }
         } else {
             m.broadcastConnectivity(mProfile.getName(), s);
         }
     }

     private void enterConnectivityLoop() {
         mStartTime = System.currentTimeMillis();

         Log.d(TAG, "   +++++   connectivity monitor running");
         try {
             for (;;) {
                 synchronized (VpnService.this) {
                     if (mState != VpnState.CONNECTED) break;
                     mNotification.update();
                     checkConnectivity();
                     VpnService.this.wait(1000); // 1 second
                 }
             }
         } catch (InterruptedException e) {
             Log.e(TAG, "connectivity monitor", e);
         }
         Log.d(TAG, "   -----   connectivity monitor stopped");
     }

     private void checkConnectivity() {
         if (mDaemonHelper.anyDaemonStopped() || isLocalIpChanged()) {
             onDisconnect();
         }
     }

     private boolean isLocalIpChanged() {
         // TODO
         if (!isDnsIntact()) {
             Log.w(TAG, "       local IP changed");
             return true;
         } else {
             return false;
         }
     }

     private boolean isDnsIntact() {
         String dns1 = SystemProperties.get(DNS1);
         if (!mVpnDns1.equals(dns1)) {
             Log.w(TAG, "   dns being overridden by: " + dns1);
             return false;
         } else {
             return true;
         }
     }

     protected void sleep(int ms) {
         try {
             Thread.currentThread().sleep(ms);
         } catch (InterruptedException e) {
         }
     }

     private class DaemonHelper {
         private List<DaemonProxy> mDaemonList =
                 new ArrayList<DaemonProxy>();

         synchronized DaemonProxy startDaemon(String daemonName)
                 throws IOException {
             DaemonProxy daemon = new DaemonProxy(daemonName);
             mDaemonList.add(daemon);
             daemon.start();
             return daemon;
         }

         synchronized void stopAll() {
             if (mDaemonList.isEmpty()) {
                 onFinalCleanUp();
             } else {
                 for (DaemonProxy s : mDaemonList) s.stop();
             }
         }

         synchronized void closeSockets() {
             for (DaemonProxy s : mDaemonList) s.closeControlSocket();
         }

         synchronized boolean anyDaemonStopped() {
             for (DaemonProxy s : mDaemonList) {
                 if (s.isStopped()) {
                     Log.w(TAG, "       daemon gone: " + s.getName());
                     return true;
                 }
             }
             return false;
         }

         private int getResultFromSocket(DaemonProxy s) {
             try {
                 return s.getResultFromSocket();
             } catch (IOException e) {
                 return -1;
             }
         }

         synchronized boolean anySocketError() {
             for (DaemonProxy s : mDaemonList) {
                 switch (getResultFromSocket(s)) {
                     case 0:
                         continue;

                     case AUTH_ERROR_CODE:
                         onError(VpnManager.VPN_ERROR_AUTH);
                         return true;

                     default:
                         onError(VpnManager.VPN_ERROR_CONNECTION_FAILED);
                         return true;
                 }
             }
             return false;
         }
     }

     // Helper class for showing, updating notification.
     private class NotificationHelper {
         void update() {
             String title = getNotificationTitle(true);
             Notification n = new Notification(R.drawable.vpn_connected, title,
                     mStartTime);
             n.setLatestEventInfo(mContext, title,
                     getNotificationMessage(true), prepareNotificationIntent());
             n.flags |= Notification.FLAG_NO_CLEAR;
             n.flags |= Notification.FLAG_ONGOING_EVENT;
             enableNotification(n);
         }

         void showDisconnect() {
             String title = getNotificationTitle(false);
             Notification n = new Notification(R.drawable.vpn_disconnected,
                     title, System.currentTimeMillis());
             n.setLatestEventInfo(mContext, title,
                     getNotificationMessage(false), prepareNotificationIntent());
             n.flags |= Notification.FLAG_AUTO_CANCEL;
             disableNotification();
             enableNotification(n);
         }

         void disableNotification() {
             ((NotificationManager) mContext.getSystemService(
                     Context.NOTIFICATION_SERVICE)).cancel(NOTIFICATION_ID);
         }

         private void enableNotification(Notification n) {
             ((NotificationManager) mContext.getSystemService(
                     Context.NOTIFICATION_SERVICE)).notify(NOTIFICATION_ID, n);
         }

         private PendingIntent prepareNotificationIntent() {
             return PendingIntent.getActivity(mContext, 0,
                     new VpnManager(mContext).createSettingsActivityIntent(), 0);
         }

         private String getNotificationTitle(boolean connected) {
             String formatString = connected
                     ? mContext.getString(
                             R.string.vpn_notification_title_connected)
                     : mContext.getString(
                             R.string.vpn_notification_title_disconnected);
             return String.format(formatString, mProfile.getName());
         }

         private String getFormattedTime(long duration) {
             long hours = duration / 3600;
             StringBuilder sb = new StringBuilder();
             if (hours > 0) sb.append(hours).append(':');
             sb.append(String.format("%02d:%02d", (duration % 3600 / 60),
                     (duration % 60)));
             return sb.toString();
         }

         private String getNotificationMessage(boolean connected) {
             if (connected) {
                 long time = (System.currentTimeMillis() - mStartTime) / 1000;
                 return getFormattedTime(time);
             } else {
                 return mContext.getString(
                         R.string.vpn_notification_hint_disconnected);
             }
         }
     }
 }
	/*
	* Copyright (C) 2009, The Android Open Source Project
	*
	* 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 com.android.server.vpn;

	import android.app.Notification;
	import android.app.NotificationManager;
	import android.app.PendingIntent;
	import android.content.Context;
	import android.net.vpn.VpnManager;
	import android.net.vpn.VpnProfile;
	import android.net.vpn.VpnState;
	import android.os.SystemProperties;
	import android.text.TextUtils;
	import android.util.Log;

	import java.io.IOException;
	import java.net.InetAddress;
	import java.net.UnknownHostException;
	import java.util.ArrayList;
	import java.util.List;

	/**
	* The service base class for managing a type of VPN connection.
	*/
	abstract class VpnService<E extends VpnProfile> {
	private static final int NOTIFICATION_ID = 1;

	private static final String DNS1 = "net.dns1";
	private static final String DNS2 = "net.dns2";
	private static final String VPN_DNS1 = "vpn.dns1";
	private static final String VPN_DNS2 = "vpn.dns2";
	private static final String VPN_STATUS = "vpn.status";
	private static final String VPN_IS_UP = "ok";
	private static final String VPN_IS_DOWN = "down";

	private static final String REMOTE_IP = "net.ipremote";
	private static final String DNS_DOMAIN_SUFFICES = "net.dns.search";

	private static final int AUTH_ERROR_CODE = 51;

	private final String TAG = VpnService.class.getSimpleName();

	E mProfile;
	VpnServiceBinder mContext;

	private VpnState mState = VpnState.IDLE;
	private Throwable mError;

	// connection settings
	private String mOriginalDns1;
	private String mOriginalDns2;
	private String mVpnDns1 = "";
	private String mVpnDns2 = "";
	private String mOriginalDomainSuffices;

	private long mStartTime; // VPN connection start time

	// for helping managing multiple daemons
	private DaemonHelper mDaemonHelper = new DaemonHelper();

	// for helping showing, updating notification
	private NotificationHelper mNotification = new NotificationHelper();

	/**
	* Establishes a VPN connection with the specified username and password.
	*/
	protected abstract void connect(String serverIp, String username,
	String password) throws IOException;

	/**
	* Starts a VPN daemon.
	*/
	protected DaemonProxy startDaemon(String daemonName)
	throws IOException {
	return mDaemonHelper.startDaemon(daemonName);
	}

	/**
	* Returns the VPN profile associated with the connection.
	*/
	protected E getProfile() {
	return mProfile;
	}

	/**
	* Returns the IP address of the specified host name.
	*/
	protected String getIp(String hostName) throws IOException {
	return InetAddress.getByName(hostName).getHostAddress();
	}

	void setContext(VpnServiceBinder context, E profile) {
	mContext = context;
	mProfile = profile;
	}

	VpnState getState() {
	return mState;
	}

	synchronized boolean onConnect(String username, String password) {
	try {
	mState = VpnState.CONNECTING;
	broadcastConnectivity(VpnState.CONNECTING);

	String serverIp = getIp(getProfile().getServerName());

	onBeforeConnect();
	connect(serverIp, username, password);
	waitUntilConnectedOrTimedout();
	return true;
	} catch (Throwable e) {
	Log.e(TAG, "onConnect()", e);
	onError(e);
	return false;
	}
	}

	synchronized void onDisconnect() {
	try {
	Log.d(TAG, " disconnecting VPN...");
	mState = VpnState.DISCONNECTING;
	broadcastConnectivity(VpnState.DISCONNECTING);
	mNotification.showDisconnect();

	mDaemonHelper.stopAll();
	} catch (Throwable e) {
	Log.e(TAG, "onDisconnect()", e);
	} finally {
	onFinalCleanUp();
	}
	}

	private void onError(Throwable error) {
	// error may occur during or after connection setup
	// and it may be due to one or all services gone
	if (mError != null) {
	Log.w(TAG, " multiple errors occur, record the last one: "
	+ error);
	}
	mError = error;
	onDisconnect();
	}

	private void onError(int errorCode) {
	onError(new VpnConnectingError(errorCode));
	}


	private void onBeforeConnect() {
	mNotification.disableNotification();

	SystemProperties.set(VPN_DNS1, "-");
	SystemProperties.set(VPN_DNS2, "-");
	SystemProperties.set(VPN_STATUS, VPN_IS_DOWN);
	Log.d(TAG, " VPN UP: " + SystemProperties.get(VPN_STATUS));
	}

	private void waitUntilConnectedOrTimedout() {
	sleep(2000); // 2 seconds
	for (int i = 0; i < 60; i++) {
	if (mState != VpnState.CONNECTING) {
	break;
	} else if (VPN_IS_UP.equals(
	SystemProperties.get(VPN_STATUS))) {
	onConnected();
	return;
	} else if (mDaemonHelper.anySocketError()) {
	return;
	}
	sleep(500); // 0.5 second
	}

	synchronized (VpnService.this) {
	if (mState == VpnState.CONNECTING) {
	Log.d(TAG, " connecting timed out !!");
	onError(new IOException("Connecting timed out"));
	}
	}
	}

	private synchronized void onConnected() {
	Log.d(TAG, "onConnected()");

	mDaemonHelper.closeSockets();
	saveVpnDnsProperties();
	saveAndSetDomainSuffices();

	mState = VpnState.CONNECTED;
	broadcastConnectivity(VpnState.CONNECTED);

	enterConnectivityLoop();
	}

	private synchronized void onFinalCleanUp() {
	Log.d(TAG, "onFinalCleanUp()");

	if (mState == VpnState.IDLE) return;

	// keep the notification when error occurs
	if (!anyError()) mNotification.disableNotification();

	restoreOriginalDnsProperties();
	restoreOriginalDomainSuffices();
	mState = VpnState.IDLE;
	broadcastConnectivity(VpnState.IDLE);

	// stop the service itself
	mContext.stopSelf();
	}

	private boolean anyError() {
	return (mError != null);
	}

	private void restoreOriginalDnsProperties() {
	// restore only if they are not overridden
	if (mVpnDns1.equals(SystemProperties.get(DNS1))) {
	Log.d(TAG, String.format("restore original dns prop: %s --> %s",
	SystemProperties.get(DNS1), mOriginalDns1));
	Log.d(TAG, String.format("restore original dns prop: %s --> %s",
	SystemProperties.get(DNS2), mOriginalDns2));
	SystemProperties.set(DNS1, mOriginalDns1);
	SystemProperties.set(DNS2, mOriginalDns2);
	}
	}

	private void saveVpnDnsProperties() {
	mOriginalDns1 = mOriginalDns2 = "";
	for (int i = 0; i < 5; i++) {
	mVpnDns1 = SystemProperties.get(VPN_DNS1);
	mVpnDns2 = SystemProperties.get(VPN_DNS2);
	if (mOriginalDns1.equals(mVpnDns1)) {
	Log.d(TAG, "wait for vpn dns to settle in..." + i);
	sleep(200);
	} else {
	mOriginalDns1 = SystemProperties.get(DNS1);
	mOriginalDns2 = SystemProperties.get(DNS2);
	SystemProperties.set(DNS1, mVpnDns1);
	SystemProperties.set(DNS2, mVpnDns2);
	Log.d(TAG, String.format("save original dns prop: %s, %s",
	mOriginalDns1, mOriginalDns2));
	Log.d(TAG, String.format("set vpn dns prop: %s, %s",
	mVpnDns1, mVpnDns2));
	return;
	}
	}
	Log.d(TAG, "saveVpnDnsProperties(): DNS not updated??");
	mOriginalDns1 = mVpnDns1 = SystemProperties.get(DNS1);
	mOriginalDns2 = mVpnDns2 = SystemProperties.get(DNS2);
	}

	private void saveAndSetDomainSuffices() {
	mOriginalDomainSuffices = SystemProperties.get(DNS_DOMAIN_SUFFICES);
	Log.d(TAG, "save original dns search: " + mOriginalDomainSuffices);
	String list = mProfile.getDomainSuffices();
	if (!TextUtils.isEmpty(list)) {
	SystemProperties.set(DNS_DOMAIN_SUFFICES, list);
	}
	}

	private void restoreOriginalDomainSuffices() {
	Log.d(TAG, "restore original dns search --> " + mOriginalDomainSuffices);
	SystemProperties.set(DNS_DOMAIN_SUFFICES, mOriginalDomainSuffices);
	}

	private void broadcastConnectivity(VpnState s) {
	VpnManager m = new VpnManager(mContext);
	Throwable err = mError;
	if ((s == VpnState.IDLE) && (err != null)) {
	if (err instanceof UnknownHostException) {
	m.broadcastConnectivity(mProfile.getName(), s,
	VpnManager.VPN_ERROR_UNKNOWN_SERVER);
	} else if (err instanceof VpnConnectingError) {
	m.broadcastConnectivity(mProfile.getName(), s,
	((VpnConnectingError) err).getErrorCode());
	} else {
	m.broadcastConnectivity(mProfile.getName(), s,
	VpnManager.VPN_ERROR_CONNECTION_FAILED);
	}
	} else {
	m.broadcastConnectivity(mProfile.getName(), s);
	}
	}

	private void enterConnectivityLoop() {
	mStartTime = System.currentTimeMillis();

	Log.d(TAG, " +++++ connectivity monitor running");
	try {
	for (;;) {
	synchronized (VpnService.this) {
	if (mState != VpnState.CONNECTED) break;
	mNotification.update();
	checkConnectivity();
	VpnService.this.wait(1000); // 1 second
	}
	}
	} catch (InterruptedException e) {
	Log.e(TAG, "connectivity monitor", e);
	}
	Log.d(TAG, " ----- connectivity monitor stopped");
	}

	private void checkConnectivity() {
	if (mDaemonHelper.anyDaemonStopped() \|\| isLocalIpChanged()) {
	onDisconnect();
	}
	}

	private boolean isLocalIpChanged() {
	// TODO
	if (!isDnsIntact()) {
	Log.w(TAG, " local IP changed");
	return true;
	} else {
	return false;
	}
	}

	private boolean isDnsIntact() {
	String dns1 = SystemProperties.get(DNS1);
	if (!mVpnDns1.equals(dns1)) {
	Log.w(TAG, " dns being overridden by: " + dns1);
	return false;
	} else {
	return true;
	}
	}

	protected void sleep(int ms) {
	try {
	Thread.currentThread().sleep(ms);
	} catch (InterruptedException e) {
	}
	}

	private class DaemonHelper {
	private List<DaemonProxy> mDaemonList =
	new ArrayList<DaemonProxy>();

	synchronized DaemonProxy startDaemon(String daemonName)
	throws IOException {
	DaemonProxy daemon = new DaemonProxy(daemonName);
	mDaemonList.add(daemon);
	daemon.start();
	return daemon;
	}

	synchronized void stopAll() {
	if (mDaemonList.isEmpty()) {
	onFinalCleanUp();
	} else {
	for (DaemonProxy s : mDaemonList) s.stop();
	}
	}

	synchronized void closeSockets() {
	for (DaemonProxy s : mDaemonList) s.closeControlSocket();
	}

	synchronized boolean anyDaemonStopped() {
	for (DaemonProxy s : mDaemonList) {
	if (s.isStopped()) {
	Log.w(TAG, " daemon gone: " + s.getName());
	return true;
	}
	}
	return false;
	}

	private int getResultFromSocket(DaemonProxy s) {
	try {
	return s.getResultFromSocket();
	} catch (IOException e) {
	return -1;
	}
	}

	synchronized boolean anySocketError() {
	for (DaemonProxy s : mDaemonList) {
	switch (getResultFromSocket(s)) {
	case 0:
	continue;

	case AUTH_ERROR_CODE:
	onError(VpnManager.VPN_ERROR_AUTH);
	return true;

	default:
	onError(VpnManager.VPN_ERROR_CONNECTION_FAILED);
	return true;
	}
	}
	return false;
	}
	}

	// Helper class for showing, updating notification.
	private class NotificationHelper {
	void update() {
	String title = getNotificationTitle(true);
	Notification n = new Notification(R.drawable.vpn_connected, title,
	mStartTime);
	n.setLatestEventInfo(mContext, title,
	getNotificationMessage(true), prepareNotificationIntent());
	n.flags \|= Notification.FLAG_NO_CLEAR;
	n.flags \|= Notification.FLAG_ONGOING_EVENT;
	enableNotification(n);
	}

	void showDisconnect() {
	String title = getNotificationTitle(false);
	Notification n = new Notification(R.drawable.vpn_disconnected,
	title, System.currentTimeMillis());
	n.setLatestEventInfo(mContext, title,
	getNotificationMessage(false), prepareNotificationIntent());
	n.flags \|= Notification.FLAG_AUTO_CANCEL;
	disableNotification();
	enableNotification(n);
	}

	void disableNotification() {
	((NotificationManager) mContext.getSystemService(
	Context.NOTIFICATION_SERVICE)).cancel(NOTIFICATION_ID);
	}

	private void enableNotification(Notification n) {
	((NotificationManager) mContext.getSystemService(
	Context.NOTIFICATION_SERVICE)).notify(NOTIFICATION_ID, n);
	}

	private PendingIntent prepareNotificationIntent() {
	return PendingIntent.getActivity(mContext, 0,
	new VpnManager(mContext).createSettingsActivityIntent(), 0);
	}

	private String getNotificationTitle(boolean connected) {
	String formatString = connected
	? mContext.getString(
	R.string.vpn_notification_title_connected)
	: mContext.getString(
	R.string.vpn_notification_title_disconnected);
	return String.format(formatString, mProfile.getName());
	}

	private String getFormattedTime(long duration) {
	long hours = duration / 3600;
	StringBuilder sb = new StringBuilder();
	if (hours > 0) sb.append(hours).append(':');
	sb.append(String.format("%02d:%02d", (duration % 3600 / 60),
	(duration % 60)));
	return sb.toString();
	}

	private String getNotificationMessage(boolean connected) {
	if (connected) {
	long time = (System.currentTimeMillis() - mStartTime) / 1000;
	return getFormattedTime(time);
	} else {
	return mContext.getString(
	R.string.vpn_notification_hint_disconnected);
	}
	}
	}
	}