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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.Context;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import java.net.InetAddress;
import java.net.UnknownHostException;
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 NETWORK_TYPE = "PROXY";
private static final String TAG = "ProxyDataTracker";
// 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 REASON_ENABLED = "enabled";
private final AtomicInteger mDefaultGatewayAddr = new AtomicInteger(0);
private final AtomicInteger mReconnectGeneration = new AtomicInteger(0);
/**
* Create a new ProxyDataTracker
*/
public ProxyDataTracker() {
mNetworkInfo = new NetworkInfo(ConnectivityManager.TYPE_PROXY, 0, NETWORK_TYPE, "");
// TODO: update available state according to proxy state.
mNetworkInfo.setIsAvailable(true);
mLinkProperties = new LinkProperties();
mLinkCapabilities = new LinkCapabilities();
try {
mLinkProperties.addDns(InetAddress.getByName(DNS1));
mLinkProperties.addDns(InetAddress.getByName(DNS2));
} catch (UnknownHostException e) {
Log.e(TAG, "Could not add DNS address", e);
}
}
public Object Clone() throws CloneNotSupportedException {
throw new CloneNotSupportedException();
}
/**
* Disable connectivity to the network.
*/
public boolean teardown() {
// TODO: tell relevant service to tear down proxy.
return true;
}
/**
* Re-enable proxy data connectivity after a {@link #teardown()}.
*/
public boolean reconnect() {
if (!isAvailable()) {
Log.w(TAG, "Reconnect requested even though network is disabled. Bailing.");
return false;
}
setTeardownRequested(false);
mReconnectGeneration.incrementAndGet();
// TODO: tell relevant service to setup proxy. Set state to connected only if setup
// succeeds.
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 = getTargetHandler().obtainMessage(EVENT_STATE_CHANGED, mNetworkInfo);
msg.sendToTarget();
}
}
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