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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 android.net;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.util.Log;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A data tracker responsible for bringing up and tearing down the system proxy server.
*
* {@hide}
*/
public class ProxyDataTracker extends BaseNetworkStateTracker {
private static final String TAG = "ProxyDataTracker";
private static final String NETWORK_TYPE = "PROXY";
// TODO: investigate how to get these DNS addresses from the system.
private static final String DNS1 = "8.8.8.8";
private static final String DNS2 = "8.8.4.4";
private static final String INTERFACE_NAME = "ifb0";
private static final String REASON_ENABLED = "enabled";
private static final String REASON_DISABLED = "disabled";
private static final String REASON_PROXY_DOWN = "proxy_down";
private static final int MSG_TEAR_DOWN_REQUEST = 1;
private static final int MSG_SETUP_REQUEST = 2;
private static final String PERMISSION_PROXY_STATUS_SENDER =
"android.permission.ACCESS_NETWORK_CONDITIONS";
private static final String ACTION_PROXY_STATUS_CHANGE =
"com.android.net.PROXY_STATUS_CHANGE";
private static final String KEY_IS_PROXY_AVAILABLE = "is_proxy_available";
private static final String KEY_REPLY_TO_MESSENGER_BINDER = "reply_to_messenger_binder";
private static final String KEY_REPLY_TO_MESSENGER_BINDER_BUNDLE =
"reply_to_messenger_binder_bundle";
private Handler mTarget;
private Messenger mProxyStatusService;
private AtomicBoolean mReconnectRequested = new AtomicBoolean(false);
private AtomicBoolean mIsProxyAvailable = new AtomicBoolean(false);
private final AtomicInteger mDefaultGatewayAddr = new AtomicInteger(0);
private final BroadcastReceiver mProxyStatusServiceListener = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(ACTION_PROXY_STATUS_CHANGE)) {
mIsProxyAvailable.set(intent.getBooleanExtra(KEY_IS_PROXY_AVAILABLE, false));
if (mIsProxyAvailable.get()) {
Bundle bundle = intent.getBundleExtra(KEY_REPLY_TO_MESSENGER_BINDER_BUNDLE);
if (bundle == null || bundle.getBinder(KEY_REPLY_TO_MESSENGER_BINDER) == null) {
Log.e(TAG, "no messenger binder in the intent to send future requests");
mIsProxyAvailable.set(false);
return;
}
mProxyStatusService =
new Messenger(bundle.getBinder(KEY_REPLY_TO_MESSENGER_BINDER));
// If there is a pending reconnect request, do it now.
if (mReconnectRequested.get()) {
reconnect();
}
} else {
setDetailedState(NetworkInfo.DetailedState.DISCONNECTED,
REASON_PROXY_DOWN, null);
}
} else {
Log.d(TAG, "Unrecognized broadcast intent");
}
}
};
/**
* Create a new ProxyDataTracker
*/
public ProxyDataTracker() {
mNetworkInfo = new NetworkInfo(ConnectivityManager.TYPE_PROXY, 0, NETWORK_TYPE, "");
mLinkProperties = new LinkProperties();
mNetworkCapabilities = new NetworkCapabilities();
mNetworkInfo.setIsAvailable(true);
try {
mLinkProperties.addDnsServer(InetAddress.getByName(DNS1));
mLinkProperties.addDnsServer(InetAddress.getByName(DNS2));
mLinkProperties.setInterfaceName(INTERFACE_NAME);
} catch (UnknownHostException e) {
Log.e(TAG, "Could not add DNS address", e);
}
}
@Override
public Object clone() throws CloneNotSupportedException {
throw new CloneNotSupportedException();
}
@Override
public void startMonitoring(Context context, Handler target) {
mContext = context;
mTarget = target;
mContext.registerReceiver(mProxyStatusServiceListener,
new IntentFilter(ACTION_PROXY_STATUS_CHANGE),
PERMISSION_PROXY_STATUS_SENDER,
null);
}
/**
* Disable connectivity to the network.
*/
public boolean teardown() {
setTeardownRequested(true);
mReconnectRequested.set(false);
try {
if (mIsProxyAvailable.get() && mProxyStatusService != null) {
mProxyStatusService.send(Message.obtain(null, MSG_TEAR_DOWN_REQUEST));
}
} catch (RemoteException e) {
Log.e(TAG, "Unable to connect to proxy status service", e);
return false;
}
setDetailedState(NetworkInfo.DetailedState.DISCONNECTED, REASON_DISABLED, null);
return true;
}
/**
* Re-enable proxy data connectivity after a {@link #teardown()}.
*/
public boolean reconnect() {
mReconnectRequested.set(true);
setTeardownRequested(false);
if (!mIsProxyAvailable.get()) {
Log.w(TAG, "Reconnect requested even though proxy service is not up. Bailing.");
return false;
}
setDetailedState(NetworkInfo.DetailedState.CONNECTING, REASON_ENABLED, null);
try {
mProxyStatusService.send(Message.obtain(null, MSG_SETUP_REQUEST));
} catch (RemoteException e) {
Log.e(TAG, "Unable to connect to proxy status service", e);
setDetailedState(NetworkInfo.DetailedState.DISCONNECTED, REASON_PROXY_DOWN, null);
return false;
}
// We'll assume proxy is set up successfully. If not, a status change broadcast will be
// received afterwards to indicate any failure.
setDetailedState(NetworkInfo.DetailedState.CONNECTED, REASON_ENABLED, null);
return true;
}
/**
* Fetch default gateway address for the network
*/
public int getDefaultGatewayAddr() {
return mDefaultGatewayAddr.get();
}
/**
* Return the system properties name associated with the tcp buffer sizes
* for this network.
*/
public String getTcpBufferSizesPropName() {
return "net.tcp.buffersize.wifi";
}
/**
* Record the detailed state of a network, and if it is a
* change from the previous state, send a notification to
* any listeners.
* @param state the new @{code DetailedState}
* @param reason a {@code String} indicating a reason for the state change,
* if one was supplied. May be {@code null}.
* @param extraInfo optional {@code String} providing extra information about the state change
*/
private void setDetailedState(NetworkInfo.DetailedState state, String reason,
String extraInfo) {
mNetworkInfo.setDetailedState(state, reason, extraInfo);
Message msg = mTarget.obtainMessage(EVENT_STATE_CHANGED, mNetworkInfo);
msg.sendToTarget();
}
}
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