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/*
* 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 android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.net.INetworkManagementEventObserver;
import android.os.Binder;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.util.Log;
import com.android.internal.R;
import com.android.internal.net.VpnConfig;
import com.android.server.ConnectivityService.VpnCallback;
/**
* @hide
*/
public class Vpn extends INetworkManagementEventObserver.Stub {
private final static String TAG = "Vpn";
private final static String VPN = android.Manifest.permission.VPN;
private final Context mContext;
private final VpnCallback mCallback;
private String mPackageName;
private String mInterfaceName;
private String mDnsPropertyPrefix;
public Vpn(Context context, VpnCallback callback) {
mContext = context;
mCallback = callback;
}
/**
* Prepare for a VPN application.
*
* @param packageName The package name of the new VPN application.
* @return The name of the current prepared package.
*/
public synchronized String prepare(String packageName) {
// Return the current prepared package if the new one is null.
if (packageName == null) {
return mPackageName;
}
// Check the permission of the caller.
PackageManager pm = mContext.getPackageManager();
VpnConfig.enforceCallingPackage(pm.getNameForUid(Binder.getCallingUid()));
// Check the permission of the given package.
if (packageName.isEmpty()) {
packageName = null;
} else if (pm.checkPermission(VPN, packageName) != PackageManager.PERMISSION_GRANTED) {
throw new SecurityException(packageName + " does not have " + VPN);
}
// Reset the interface and hide the notification.
if (mInterfaceName != null) {
nativeReset(mInterfaceName);
mCallback.restore();
hideNotification();
mInterfaceName = null;
}
// Notify the package being revoked.
if (mPackageName != null) {
Intent intent = new Intent(VpnConfig.ACTION_VPN_REVOKED);
intent.setPackage(mPackageName);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
mContext.sendBroadcast(intent);
}
Log.i(TAG, "Switched from " + mPackageName + " to " + packageName);
mPackageName = packageName;
return mPackageName;
}
/**
* 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 name The name of the interface.
*/
public void protect(ParcelFileDescriptor socket, String name) {
mContext.enforceCallingPermission(VPN, "protect");
nativeProtect(socket.getFd(), name);
}
/**
* Configure a TUN interface and return its file descriptor.
*
* @param configuration The parameters to configure the interface.
* @return The file descriptor of the interface.
*/
public synchronized ParcelFileDescriptor establish(VpnConfig config) {
// Check the permission of the caller.
mContext.enforceCallingPermission(VPN, "establish");
// Check if the caller is already prepared.
PackageManager pm = mContext.getPackageManager();
ApplicationInfo app = null;
try {
app = pm.getApplicationInfo(mPackageName, 0);
} catch (Exception e) {
return null;
}
if (Binder.getCallingUid() != app.uid) {
return null;
}
// Create and configure the interface.
ParcelFileDescriptor descriptor = ParcelFileDescriptor.adoptFd(
nativeEstablish(config.mtu, config.addresses, config.routes));
// Replace the interface and abort if it fails.
try {
String interfaceName = nativeGetName(descriptor.getFd());
if (mInterfaceName != null && !mInterfaceName.equals(interfaceName)) {
nativeReset(mInterfaceName);
}
mInterfaceName = interfaceName;
} catch (RuntimeException e) {
try {
descriptor.close();
} catch (Exception ex) {
// ignore
}
throw e;
}
String dnsServers = (config.dnsServers == null) ? "" : config.dnsServers.trim();
mCallback.override(dnsServers.isEmpty() ? null : dnsServers.split(" "));
config.packageName = mPackageName;
config.interfaceName = mInterfaceName;
showNotification(pm, app, config);
return descriptor;
}
// INetworkManagementEventObserver.Stub
public void interfaceLinkStatusChanged(String name, boolean up) {
}
// INetworkManagementEventObserver.Stub
public void interfaceAdded(String name) {
}
// INetworkManagementEventObserver.Stub
public synchronized void interfaceRemoved(String name) {
if (name.equals(mInterfaceName) && nativeCheck(name) == 0) {
hideNotification();
mInterfaceName = null;
mCallback.restore();
}
}
private void showNotification(PackageManager pm, ApplicationInfo app, VpnConfig config) {
NotificationManager nm = (NotificationManager)
mContext.getSystemService(Context.NOTIFICATION_SERVICE);
if (nm != null) {
// 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);
icon.draw(new Canvas(bitmap));
}
// Load the label.
String label = app.loadLabel(pm).toString();
// Build the notification.
String text = (config.sessionName == null) ? mContext.getString(R.string.vpn_text) :
mContext.getString(R.string.vpn_text_long, config.sessionName);
long identity = Binder.clearCallingIdentity();
Notification notification = new Notification.Builder(mContext)
.setSmallIcon(R.drawable.vpn_connected)
.setLargeIcon(bitmap)
.setTicker(mContext.getString(R.string.vpn_ticker, label))
.setContentTitle(mContext.getString(R.string.vpn_title, label))
.setContentText(text)
.setContentIntent(VpnConfig.getIntentForNotification(mContext, config))
.setDefaults(Notification.DEFAULT_ALL)
.setOngoing(true)
.getNotification();
nm.notify(R.drawable.vpn_connected, notification);
Binder.restoreCallingIdentity(identity);
}
}
private void hideNotification() {
NotificationManager nm = (NotificationManager)
mContext.getSystemService(Context.NOTIFICATION_SERVICE);
if (nm != null) {
long identity = Binder.clearCallingIdentity();
nm.cancel(R.drawable.vpn_connected);
Binder.restoreCallingIdentity(identity);
}
}
private native int nativeEstablish(int mtu, String addresses, String routes);
private native String nativeGetName(int fd);
private native void nativeReset(String name);
private native int nativeCheck(String name);
private native void nativeProtect(int fd, String name);
}
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