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/*
* Copyright (C) 2014 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.ethernet;
import android.content.Context;
import android.content.pm.PackageManager;
import android.net.IEthernetManager;
import android.net.IEthernetServiceListener;
import android.net.ITetheredInterfaceCallback;
import android.net.IpConfiguration;
import android.net.NetworkStack;
import android.os.Binder;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.RemoteException;
import android.provider.Settings;
import android.util.Log;
import android.util.PrintWriterPrinter;
import com.android.internal.util.IndentingPrintWriter;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* EthernetServiceImpl handles remote Ethernet operation requests by implementing
* the IEthernetManager interface.
*/
public class EthernetServiceImpl extends IEthernetManager.Stub {
private static final String TAG = "EthernetServiceImpl";
private final Context mContext;
private final AtomicBoolean mStarted = new AtomicBoolean(false);
private Handler mHandler;
private EthernetTracker mTracker;
public EthernetServiceImpl(Context context) {
mContext = context;
}
private void enforceAccessPermission() {
mContext.enforceCallingOrSelfPermission(
android.Manifest.permission.ACCESS_NETWORK_STATE,
"EthernetService");
}
private void enforceUseRestrictedNetworksPermission() {
mContext.enforceCallingOrSelfPermission(
android.Manifest.permission.CONNECTIVITY_USE_RESTRICTED_NETWORKS,
"ConnectivityService");
}
private boolean checkUseRestrictedNetworksPermission() {
return mContext.checkCallingOrSelfPermission(
android.Manifest.permission.CONNECTIVITY_USE_RESTRICTED_NETWORKS)
== PackageManager.PERMISSION_GRANTED;
}
public void start() {
Log.i(TAG, "Starting Ethernet service");
HandlerThread handlerThread = new HandlerThread("EthernetServiceThread");
handlerThread.start();
mHandler = new Handler(handlerThread.getLooper());
mTracker = new EthernetTracker(mContext, mHandler);
mTracker.start();
mStarted.set(true);
}
@Override
public String[] getAvailableInterfaces() throws RemoteException {
return mTracker.getInterfaces(checkUseRestrictedNetworksPermission());
}
/**
* Get Ethernet configuration
* @return the Ethernet Configuration, contained in {@link IpConfiguration}.
*/
@Override
public IpConfiguration getConfiguration(String iface) {
enforceAccessPermission();
if (mTracker.isRestrictedInterface(iface)) {
enforceUseRestrictedNetworksPermission();
}
return new IpConfiguration(mTracker.getIpConfiguration(iface));
}
/**
* Set Ethernet configuration
*/
@Override
public void setConfiguration(String iface, IpConfiguration config) {
if (!mStarted.get()) {
Log.w(TAG, "System isn't ready enough to change ethernet configuration");
}
NetworkStack.checkNetworkStackPermission(mContext);
if (mTracker.isRestrictedInterface(iface)) {
enforceUseRestrictedNetworksPermission();
}
// TODO: this does not check proxy settings, gateways, etc.
// Fix this by making IpConfiguration a complete representation of static configuration.
mTracker.updateIpConfiguration(iface, new IpConfiguration(config));
}
/**
* Indicates whether given interface is available.
*/
@Override
public boolean isAvailable(String iface) {
enforceAccessPermission();
if (mTracker.isRestrictedInterface(iface)) {
enforceUseRestrictedNetworksPermission();
}
return mTracker.isTrackingInterface(iface);
}
/**
* Adds a listener.
* @param listener A {@link IEthernetServiceListener} to add.
*/
public void addListener(IEthernetServiceListener listener) {
if (listener == null) {
throw new IllegalArgumentException("listener must not be null");
}
enforceAccessPermission();
mTracker.addListener(listener, checkUseRestrictedNetworksPermission());
}
/**
* Removes a listener.
* @param listener A {@link IEthernetServiceListener} to remove.
*/
public void removeListener(IEthernetServiceListener listener) {
if (listener == null) {
throw new IllegalArgumentException("listener must not be null");
}
enforceAccessPermission();
mTracker.removeListener(listener);
}
@Override
public void setIncludeTestInterfaces(boolean include) {
NetworkStack.checkNetworkStackPermissionOr(mContext,
android.Manifest.permission.NETWORK_SETTINGS);
mTracker.setIncludeTestInterfaces(include);
}
@Override
public void requestTetheredInterface(ITetheredInterfaceCallback callback) {
NetworkStack.checkNetworkStackPermissionOr(mContext,
android.Manifest.permission.NETWORK_SETTINGS);
mTracker.requestTetheredInterface(callback);
}
@Override
public void releaseTetheredInterface(ITetheredInterfaceCallback callback) {
NetworkStack.checkNetworkStackPermissionOr(mContext,
android.Manifest.permission.NETWORK_SETTINGS);
mTracker.releaseTetheredInterface(callback);
}
@Override
protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
final IndentingPrintWriter pw = new IndentingPrintWriter(writer, " ");
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
!= PackageManager.PERMISSION_GRANTED) {
pw.println("Permission Denial: can't dump EthernetService from pid="
+ Binder.getCallingPid()
+ ", uid=" + Binder.getCallingUid());
return;
}
pw.println("Current Ethernet state: ");
pw.increaseIndent();
mTracker.dump(fd, pw, args);
pw.decreaseIndent();
pw.println("Handler:");
pw.increaseIndent();
mHandler.dump(new PrintWriterPrinter(pw), "EthernetServiceImpl");
pw.decreaseIndent();
}
}
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