/* * Copyright (C) 2011 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.connectivity; import static android.Manifest.permission.BIND_VPN_SERVICE; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.content.pm.ResolveInfo; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.drawable.Drawable; import android.net.BaseNetworkStateTracker; import android.net.ConnectivityManager; import android.net.INetworkManagementEventObserver; import android.net.LinkProperties; import android.net.LocalSocket; import android.net.LocalSocketAddress; import android.net.NetworkInfo; import android.net.RouteInfo; import android.net.NetworkInfo.DetailedState; import android.os.Binder; import android.os.FileUtils; import android.os.IBinder; import android.os.INetworkManagementService; import android.os.Parcel; import android.os.ParcelFileDescriptor; import android.os.Process; import android.os.RemoteException; import android.os.SystemClock; import android.os.SystemService; import android.os.UserHandle; import android.security.Credentials; import android.security.KeyStore; import android.util.Log; import android.widget.Toast; import com.android.internal.R; import com.android.internal.net.LegacyVpnInfo; import com.android.internal.net.VpnConfig; import com.android.internal.net.VpnProfile; import com.android.internal.util.Preconditions; import com.android.server.ConnectivityService.VpnCallback; import com.android.server.net.BaseNetworkObserver; import java.io.File; import java.io.InputStream; import java.io.OutputStream; import java.net.Inet4Address; import java.net.InetAddress; import java.nio.charset.Charsets; import java.util.Arrays; import libcore.io.IoUtils; /** * @hide */ public class Vpn extends BaseNetworkStateTracker { private static final String TAG = "Vpn"; private static final boolean LOGD = true; // TODO: create separate trackers for each unique VPN to support // automated reconnection private final VpnCallback mCallback; private String mPackage = VpnConfig.LEGACY_VPN; private String mInterface; private Connection mConnection; private LegacyVpnRunner mLegacyVpnRunner; private PendingIntent mStatusIntent; private boolean mEnableNotif = true; public Vpn(Context context, VpnCallback callback, INetworkManagementService netService) { // TODO: create dedicated TYPE_VPN network type super(ConnectivityManager.TYPE_DUMMY); mContext = context; mCallback = callback; try { netService.registerObserver(mObserver); } catch (RemoteException e) { Log.wtf(TAG, "Problem registering observer", e); } } public void setEnableNotifications(boolean enableNotif) { mEnableNotif = enableNotif; } @Override protected void startMonitoringInternal() { // Ignored; events are sent through callbacks for now } @Override public boolean teardown() { // TODO: finish migration to unique tracker for each VPN throw new UnsupportedOperationException(); } @Override public boolean reconnect() { // TODO: finish migration to unique tracker for each VPN throw new UnsupportedOperationException(); } @Override public String getTcpBufferSizesPropName() { return PROP_TCP_BUFFER_UNKNOWN; } /** * Update current state, dispaching event to listeners. */ private void updateState(DetailedState detailedState, String reason) { if (LOGD) Log.d(TAG, "setting state=" + detailedState + ", reason=" + reason); mNetworkInfo.setDetailedState(detailedState, reason, null); mCallback.onStateChanged(new NetworkInfo(mNetworkInfo)); } /** * Prepare for a VPN application. This method is designed to solve * race conditions. It first compares the current prepared package * with {@code oldPackage}. If they are the same, the prepared * package is revoked and replaced with {@code newPackage}. If * {@code oldPackage} is {@code null}, the comparison is omitted. * If {@code newPackage} is the same package or {@code null}, the * revocation is omitted. This method returns {@code true} if the * operation is succeeded. * * Legacy VPN is handled specially since it is not a real package. * It uses {@link VpnConfig#LEGACY_VPN} as its package name, and * it can be revoked by itself. * * @param oldPackage The package name of the old VPN application. * @param newPackage The package name of the new VPN application. * @return true if the operation is succeeded. */ public synchronized boolean prepare(String oldPackage, String newPackage) { // Return false if the package does not match. if (oldPackage != null && !oldPackage.equals(mPackage)) { return false; } // Return true if we do not need to revoke. if (newPackage == null || (newPackage.equals(mPackage) && !newPackage.equals(VpnConfig.LEGACY_VPN))) { return true; } // Check if the caller is authorized. enforceControlPermission(); // Reset the interface and hide the notification. if (mInterface != null) { jniReset(mInterface); final long token = Binder.clearCallingIdentity(); try { mCallback.restore(); hideNotification(); } finally { Binder.restoreCallingIdentity(token); } mInterface = null; } // Revoke the connection or stop LegacyVpnRunner. if (mConnection != null) { try { mConnection.mService.transact(IBinder.LAST_CALL_TRANSACTION, Parcel.obtain(), null, IBinder.FLAG_ONEWAY); } catch (Exception e) { // ignore } mContext.unbindService(mConnection); mConnection = null; } else if (mLegacyVpnRunner != null) { mLegacyVpnRunner.exit(); mLegacyVpnRunner = null; } Log.i(TAG, "Switched from " + mPackage + " to " + newPackage); mPackage = newPackage; updateState(DetailedState.IDLE, "prepare"); return true; } /** * Protect a socket from routing changes by binding it to the given * interface. The socket is NOT closed by this method. * * @param socket The socket to be bound. * @param interfaze The name of the interface. */ public void protect(ParcelFileDescriptor socket, String interfaze) throws Exception { PackageManager pm = mContext.getPackageManager(); ApplicationInfo app = pm.getApplicationInfo(mPackage, 0); if (Binder.getCallingUid() != app.uid) { throw new SecurityException("Unauthorized Caller"); } jniProtect(socket.getFd(), interfaze); } /** * Establish a VPN network and return the file descriptor of the VPN * interface. This methods returns {@code null} if the application is * revoked or not prepared. * * @param config The parameters to configure the network. * @return The file descriptor of the VPN interface. */ public synchronized ParcelFileDescriptor establish(VpnConfig config) { // Check if the caller is already prepared. PackageManager pm = mContext.getPackageManager(); ApplicationInfo app = null; try { app = pm.getApplicationInfo(mPackage, 0); } catch (Exception e) { return null; } if (Binder.getCallingUid() != app.uid) { return null; } // Check if the service is properly declared. Intent intent = new Intent(VpnConfig.SERVICE_INTERFACE); intent.setClassName(mPackage, config.user); ResolveInfo info = pm.resolveService(intent, 0); if (info == null) { throw new SecurityException("Cannot find " + config.user); } if (!BIND_VPN_SERVICE.equals(info.serviceInfo.permission)) { throw new SecurityException(config.user + " does not require " + BIND_VPN_SERVICE); } // Load the label. String label = app.loadLabel(pm).toString(); // Load the icon and convert it into a bitmap. Drawable icon = app.loadIcon(pm); Bitmap bitmap = null; if (icon.getIntrinsicWidth() > 0 && icon.getIntrinsicHeight() > 0) { int width = mContext.getResources().getDimensionPixelSize( android.R.dimen.notification_large_icon_width); int height = mContext.getResources().getDimensionPixelSize( android.R.dimen.notification_large_icon_height); icon.setBounds(0, 0, width, height); bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Canvas c = new Canvas(bitmap); icon.draw(c); c.setBitmap(null); } // Configure the interface. Abort if any of these steps fails. ParcelFileDescriptor tun = ParcelFileDescriptor.adoptFd(jniCreate(config.mtu)); try { updateState(DetailedState.CONNECTING, "establish"); String interfaze = jniGetName(tun.getFd()); if (jniSetAddresses(interfaze, config.addresses) < 1) { throw new IllegalArgumentException("At least one address must be specified"); } if (config.routes != null) { jniSetRoutes(interfaze, config.routes); } Connection connection = new Connection(); if (!mContext.bindService(intent, connection, Context.BIND_AUTO_CREATE)) { throw new IllegalStateException("Cannot bind " + config.user); } if (mConnection != null) { mContext.unbindService(mConnection); } if (mInterface != null && !mInterface.equals(interfaze)) { jniReset(mInterface); } mConnection = connection; mInterface = interfaze; } catch (RuntimeException e) { updateState(DetailedState.FAILED, "establish"); IoUtils.closeQuietly(tun); throw e; } Log.i(TAG, "Established by " + config.user + " on " + mInterface); // Fill more values. config.user = mPackage; config.interfaze = mInterface; // Override DNS servers and show the notification. final long token = Binder.clearCallingIdentity(); try { mCallback.override(config.dnsServers, config.searchDomains); showNotification(config, label, bitmap); } finally { Binder.restoreCallingIdentity(token); } // TODO: ensure that contract class eventually marks as connected updateState(DetailedState.AUTHENTICATING, "establish"); return tun; } @Deprecated public synchronized void interfaceStatusChanged(String iface, boolean up) { try { mObserver.interfaceStatusChanged(iface, up); } catch (RemoteException e) { // ignored; target is local } } private INetworkManagementEventObserver mObserver = new BaseNetworkObserver() { @Override public void interfaceStatusChanged(String interfaze, boolean up) { synchronized (Vpn.this) { if (!up && mLegacyVpnRunner != null) { mLegacyVpnRunner.check(interfaze); } } } @Override public void interfaceRemoved(String interfaze) { synchronized (Vpn.this) { if (interfaze.equals(mInterface) && jniCheck(interfaze) == 0) { final long token = Binder.clearCallingIdentity(); try { mCallback.restore(); hideNotification(); } finally { Binder.restoreCallingIdentity(token); } mInterface = null; if (mConnection != null) { mContext.unbindService(mConnection); mConnection = null; updateState(DetailedState.DISCONNECTED, "interfaceRemoved"); } else if (mLegacyVpnRunner != null) { mLegacyVpnRunner.exit(); mLegacyVpnRunner = null; } } } } }; private void enforceControlPermission() { // System user is allowed to control VPN. if (Binder.getCallingUid() == Process.SYSTEM_UID) { return; } try { // System dialogs are also allowed to control VPN. PackageManager pm = mContext.getPackageManager(); ApplicationInfo app = pm.getApplicationInfo(VpnConfig.DIALOGS_PACKAGE, 0); if (Binder.getCallingUid() == app.uid) { return; } } catch (Exception e) { // ignore } throw new SecurityException("Unauthorized Caller"); } private class Connection implements ServiceConnection { private IBinder mService; @Override public void onServiceConnected(ComponentName name, IBinder service) { mService = service; } @Override public void onServiceDisconnected(ComponentName name) { mService = null; } } private void showNotification(VpnConfig config, String label, Bitmap icon) { if (!mEnableNotif) return; mStatusIntent = VpnConfig.getIntentForStatusPanel(mContext, config); NotificationManager nm = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE); if (nm != null) { String title = (label == null) ? mContext.getString(R.string.vpn_title) : mContext.getString(R.string.vpn_title_long, label); String text = (config.session == null) ? mContext.getString(R.string.vpn_text) : mContext.getString(R.string.vpn_text_long, config.session); config.startTime = SystemClock.elapsedRealtime(); Notification notification = new Notification.Builder(mContext) .setSmallIcon(R.drawable.vpn_connected) .setLargeIcon(icon) .setContentTitle(title) .setContentText(text) .setContentIntent(mStatusIntent) .setDefaults(0) .setOngoing(true) .build(); nm.notifyAsUser(null, R.drawable.vpn_connected, notification, UserHandle.ALL); } } private void hideNotification() { if (!mEnableNotif) return; mStatusIntent = null; NotificationManager nm = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE); if (nm != null) { nm.cancelAsUser(null, R.drawable.vpn_connected, UserHandle.ALL); } } private native int jniCreate(int mtu); private native String jniGetName(int tun); private native int jniSetAddresses(String interfaze, String addresses); private native int jniSetRoutes(String interfaze, String routes); private native void jniReset(String interfaze); private native int jniCheck(String interfaze); private native void jniProtect(int socket, String interfaze); private static String findLegacyVpnGateway(LinkProperties prop) { for (RouteInfo route : prop.getRoutes()) { // Currently legacy VPN only works on IPv4. if (route.isDefaultRoute() && route.getGateway() instanceof Inet4Address) { return route.getGateway().getHostAddress(); } } throw new IllegalStateException("Unable to find suitable gateway"); } /** * Start legacy VPN, controlling native daemons as needed. Creates a * secondary thread to perform connection work, returning quickly. */ public void startLegacyVpn(VpnProfile profile, KeyStore keyStore, LinkProperties egress) { if (keyStore.state() != KeyStore.State.UNLOCKED) { throw new IllegalStateException("KeyStore isn't unlocked"); } final String iface = egress.getInterfaceName(); final String gateway = findLegacyVpnGateway(egress); // Load certificates. String privateKey = ""; String userCert = ""; String caCert = ""; String serverCert = ""; if (!profile.ipsecUserCert.isEmpty()) { privateKey = Credentials.USER_PRIVATE_KEY + profile.ipsecUserCert; byte[] value = keyStore.get(Credentials.USER_CERTIFICATE + profile.ipsecUserCert); userCert = (value == null) ? null : new String(value, Charsets.UTF_8); } if (!profile.ipsecCaCert.isEmpty()) { byte[] value = keyStore.get(Credentials.CA_CERTIFICATE + profile.ipsecCaCert); caCert = (value == null) ? null : new String(value, Charsets.UTF_8); } if (!profile.ipsecServerCert.isEmpty()) { byte[] value = keyStore.get(Credentials.USER_CERTIFICATE + profile.ipsecServerCert); serverCert = (value == null) ? null : new String(value, Charsets.UTF_8); } if (privateKey == null || userCert == null || caCert == null || serverCert == null) { throw new IllegalStateException("Cannot load credentials"); } // Prepare arguments for racoon. String[] racoon = null; switch (profile.type) { case VpnProfile.TYPE_L2TP_IPSEC_PSK: racoon = new String[] { iface, profile.server, "udppsk", profile.ipsecIdentifier, profile.ipsecSecret, "1701", }; break; case VpnProfile.TYPE_L2TP_IPSEC_RSA: racoon = new String[] { iface, profile.server, "udprsa", privateKey, userCert, caCert, serverCert, "1701", }; break; case VpnProfile.TYPE_IPSEC_XAUTH_PSK: racoon = new String[] { iface, profile.server, "xauthpsk", profile.ipsecIdentifier, profile.ipsecSecret, profile.username, profile.password, "", gateway, }; break; case VpnProfile.TYPE_IPSEC_XAUTH_RSA: racoon = new String[] { iface, profile.server, "xauthrsa", privateKey, userCert, caCert, serverCert, profile.username, profile.password, "", gateway, }; break; case VpnProfile.TYPE_IPSEC_HYBRID_RSA: racoon = new String[] { iface, profile.server, "hybridrsa", caCert, serverCert, profile.username, profile.password, "", gateway, }; break; } // Prepare arguments for mtpd. String[] mtpd = null; switch (profile.type) { case VpnProfile.TYPE_PPTP: mtpd = new String[] { iface, "pptp", profile.server, "1723", "name", profile.username, "password", profile.password, "linkname", "vpn", "refuse-eap", "nodefaultroute", "usepeerdns", "idle", "1800", "mtu", "1400", "mru", "1400", (profile.mppe ? "+mppe" : "nomppe"), }; break; case VpnProfile.TYPE_L2TP_IPSEC_PSK: case VpnProfile.TYPE_L2TP_IPSEC_RSA: mtpd = new String[] { iface, "l2tp", profile.server, "1701", profile.l2tpSecret, "name", profile.username, "password", profile.password, "linkname", "vpn", "refuse-eap", "nodefaultroute", "usepeerdns", "idle", "1800", "mtu", "1400", "mru", "1400", }; break; } VpnConfig config = new VpnConfig(); config.legacy = true; config.user = profile.key; config.interfaze = iface; config.session = profile.name; config.routes = profile.routes; if (!profile.dnsServers.isEmpty()) { config.dnsServers = Arrays.asList(profile.dnsServers.split(" +")); } if (!profile.searchDomains.isEmpty()) { config.searchDomains = Arrays.asList(profile.searchDomains.split(" +")); } startLegacyVpn(config, racoon, mtpd); } private synchronized void startLegacyVpn(VpnConfig config, String[] racoon, String[] mtpd) { stopLegacyVpn(); // Prepare for the new request. This also checks the caller. prepare(null, VpnConfig.LEGACY_VPN); updateState(DetailedState.CONNECTING, "startLegacyVpn"); // Start a new LegacyVpnRunner and we are done! mLegacyVpnRunner = new LegacyVpnRunner(config, racoon, mtpd); mLegacyVpnRunner.start(); } public synchronized void stopLegacyVpn() { if (mLegacyVpnRunner != null) { mLegacyVpnRunner.exit(); mLegacyVpnRunner = null; synchronized (LegacyVpnRunner.TAG) { // wait for old thread to completely finish before spinning up // new instance, otherwise state updates can be out of order. } } } /** * Return the information of the current ongoing legacy VPN. */ public synchronized LegacyVpnInfo getLegacyVpnInfo() { // Check if the caller is authorized. enforceControlPermission(); if (mLegacyVpnRunner == null) return null; final LegacyVpnInfo info = new LegacyVpnInfo(); info.key = mLegacyVpnRunner.mConfig.user; info.state = LegacyVpnInfo.stateFromNetworkInfo(mNetworkInfo); if (mNetworkInfo.isConnected()) { info.intent = mStatusIntent; } return info; } public VpnConfig getLegacyVpnConfig() { if (mLegacyVpnRunner != null) { return mLegacyVpnRunner.mConfig; } else { return null; } } /** * Bringing up a VPN connection takes time, and that is all this thread * does. Here we have plenty of time. The only thing we need to take * care of is responding to interruptions as soon as possible. Otherwise * requests will be piled up. This can be done in a Handler as a state * machine, but it is much easier to read in the current form. */ private class LegacyVpnRunner extends Thread { private static final String TAG = "LegacyVpnRunner"; private final VpnConfig mConfig; private final String[] mDaemons; private final String[][] mArguments; private final LocalSocket[] mSockets; private final String mOuterInterface; private long mTimer = -1; public LegacyVpnRunner(VpnConfig config, String[] racoon, String[] mtpd) { super(TAG); mConfig = config; mDaemons = new String[] {"racoon", "mtpd"}; // TODO: clear arguments from memory once launched mArguments = new String[][] {racoon, mtpd}; mSockets = new LocalSocket[mDaemons.length]; // This is the interface which VPN is running on, // mConfig.interfaze will change to point to OUR // internal interface soon. TODO - add inner/outer to mconfig mOuterInterface = mConfig.interfaze; } public void check(String interfaze) { if (interfaze.equals(mOuterInterface)) { Log.i(TAG, "Legacy VPN is going down with " + interfaze); exit(); } } public void exit() { // We assume that everything is reset after stopping the daemons. interrupt(); for (LocalSocket socket : mSockets) { IoUtils.closeQuietly(socket); } updateState(DetailedState.DISCONNECTED, "exit"); } @Override public void run() { // Wait for the previous thread since it has been interrupted. Log.v(TAG, "Waiting"); synchronized (TAG) { Log.v(TAG, "Executing"); execute(); monitorDaemons(); } } private void checkpoint(boolean yield) throws InterruptedException { long now = SystemClock.elapsedRealtime(); if (mTimer == -1) { mTimer = now; Thread.sleep(1); } else if (now - mTimer <= 60000) { Thread.sleep(yield ? 200 : 1); } else { updateState(DetailedState.FAILED, "checkpoint"); throw new IllegalStateException("Time is up"); } } private void execute() { // Catch all exceptions so we can clean up few things. boolean initFinished = false; try { // Initialize the timer. checkpoint(false); // Wait for the daemons to stop. for (String daemon : mDaemons) { while (!SystemService.isStopped(daemon)) { checkpoint(true); } } // Clear the previous state. File state = new File("/data/misc/vpn/state"); state.delete(); if (state.exists()) { throw new IllegalStateException("Cannot delete the state"); } new File("/data/misc/vpn/abort").delete(); initFinished = true; // Check if we need to restart any of the daemons. boolean restart = false; for (String[] arguments : mArguments) { restart = restart || (arguments != null); } if (!restart) { updateState(DetailedState.DISCONNECTED, "execute"); return; } updateState(DetailedState.CONNECTING, "execute"); // Start the daemon with arguments. for (int i = 0; i < mDaemons.length; ++i) { String[] arguments = mArguments[i]; if (arguments == null) { continue; } // Start the daemon. String daemon = mDaemons[i]; SystemService.start(daemon); // Wait for the daemon to start. while (!SystemService.isRunning(daemon)) { checkpoint(true); } // Create the control socket. mSockets[i] = new LocalSocket(); LocalSocketAddress address = new LocalSocketAddress( daemon, LocalSocketAddress.Namespace.RESERVED); // Wait for the socket to connect. while (true) { try { mSockets[i].connect(address); break; } catch (Exception e) { // ignore } checkpoint(true); } mSockets[i].setSoTimeout(500); // Send over the arguments. OutputStream out = mSockets[i].getOutputStream(); for (String argument : arguments) { byte[] bytes = argument.getBytes(Charsets.UTF_8); if (bytes.length >= 0xFFFF) { throw new IllegalArgumentException("Argument is too large"); } out.write(bytes.length >> 8); out.write(bytes.length); out.write(bytes); checkpoint(false); } out.write(0xFF); out.write(0xFF); out.flush(); // Wait for End-of-File. InputStream in = mSockets[i].getInputStream(); while (true) { try { if (in.read() == -1) { break; } } catch (Exception e) { // ignore } checkpoint(true); } } // Wait for the daemons to create the new state. while (!state.exists()) { // Check if a running daemon is dead. for (int i = 0; i < mDaemons.length; ++i) { String daemon = mDaemons[i]; if (mArguments[i] != null && !SystemService.isRunning(daemon)) { throw new IllegalStateException(daemon + " is dead"); } } checkpoint(true); } // Now we are connected. Read and parse the new state. String[] parameters = FileUtils.readTextFile(state, 0, null).split("\n", -1); if (parameters.length != 6) { throw new IllegalStateException("Cannot parse the state"); } // Set the interface and the addresses in the config. mConfig.interfaze = parameters[0].trim(); mConfig.addresses = parameters[1].trim(); // Set the routes if they are not set in the config. if (mConfig.routes == null || mConfig.routes.isEmpty()) { mConfig.routes = parameters[2].trim(); } // Set the DNS servers if they are not set in the config. if (mConfig.dnsServers == null || mConfig.dnsServers.size() == 0) { String dnsServers = parameters[3].trim(); if (!dnsServers.isEmpty()) { mConfig.dnsServers = Arrays.asList(dnsServers.split(" ")); } } // Set the search domains if they are not set in the config. if (mConfig.searchDomains == null || mConfig.searchDomains.size() == 0) { String searchDomains = parameters[4].trim(); if (!searchDomains.isEmpty()) { mConfig.searchDomains = Arrays.asList(searchDomains.split(" ")); } } // Set the routes. jniSetRoutes(mConfig.interfaze, mConfig.routes); // Here is the last step and it must be done synchronously. synchronized (Vpn.this) { // Check if the thread is interrupted while we are waiting. checkpoint(false); // Check if the interface is gone while we are waiting. if (jniCheck(mConfig.interfaze) == 0) { throw new IllegalStateException(mConfig.interfaze + " is gone"); } // Now INetworkManagementEventObserver is watching our back. mInterface = mConfig.interfaze; mCallback.override(mConfig.dnsServers, mConfig.searchDomains); showNotification(mConfig, null, null); Log.i(TAG, "Connected!"); updateState(DetailedState.CONNECTED, "execute"); } } catch (Exception e) { Log.i(TAG, "Aborting", e); exit(); } finally { // Kill the daemons if they fail to stop. if (!initFinished) { for (String daemon : mDaemons) { SystemService.stop(daemon); } } // Do not leave an unstable state. if (!initFinished || mNetworkInfo.getDetailedState() == DetailedState.CONNECTING) { updateState(DetailedState.FAILED, "execute"); } } } /** * Monitor the daemons we started, moving to disconnected state if the * underlying services fail. */ private void monitorDaemons() { if (!mNetworkInfo.isConnected()) { return; } try { while (true) { Thread.sleep(2000); for (int i = 0; i < mDaemons.length; i++) { if (mArguments[i] != null && SystemService.isStopped(mDaemons[i])) { return; } } } } catch (InterruptedException e) { Log.d(TAG, "interrupted during monitorDaemons(); stopping services"); } finally { for (String daemon : mDaemons) { SystemService.stop(daemon); } updateState(DetailedState.DISCONNECTED, "babysit"); } } } }