| /* |
| * 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.net.NetworkUtils; |
| import android.os.Parcelable; |
| import android.os.Parcel; |
| |
| import java.io.IOException; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.Socket; |
| import java.net.SocketException; |
| import java.net.UnknownHostException; |
| import javax.net.SocketFactory; |
| |
| /** |
| * Identifies a {@code Network}. This is supplied to applications via |
| * {@link ConnectivityManager.NetworkCallback} in response to the active |
| * {@link ConnectivityManager#requestNetwork} or passive |
| * {@link ConnectivityManager#registerNetworkCallback} calls. |
| * It is used to direct traffic to the given {@code Network}, either on a {@link Socket} basis |
| * through a targeted {@link SocketFactory} or process-wide via |
| * {@link ConnectivityManager#setProcessDefaultNetwork}. |
| */ |
| public class Network implements Parcelable { |
| |
| /** |
| * @hide |
| */ |
| public final int netId; |
| |
| private NetworkBoundSocketFactory mNetworkBoundSocketFactory = null; |
| |
| /** |
| * @hide |
| */ |
| public Network(int netId) { |
| this.netId = netId; |
| } |
| |
| /** |
| * @hide |
| */ |
| public Network(Network that) { |
| this.netId = that.netId; |
| } |
| |
| /** |
| * Operates the same as {@code InetAddress.getAllByName} except that host |
| * resolution is done on this network. |
| * |
| * @param host the hostname or literal IP string to be resolved. |
| * @return the array of addresses associated with the specified host. |
| * @throws UnknownHostException if the address lookup fails. |
| */ |
| public InetAddress[] getAllByName(String host) throws UnknownHostException { |
| return InetAddress.getAllByNameOnNet(host, netId); |
| } |
| |
| /** |
| * Operates the same as {@code InetAddress.getByName} except that host |
| * resolution is done on this network. |
| * |
| * @param host |
| * the hostName to be resolved to an address or {@code null}. |
| * @return the {@code InetAddress} instance representing the host. |
| * @throws UnknownHostException |
| * if the address lookup fails. |
| */ |
| public InetAddress getByName(String host) throws UnknownHostException { |
| return InetAddress.getByNameOnNet(host, netId); |
| } |
| |
| /** |
| * A {@code SocketFactory} that produces {@code Socket}'s bound to this network. |
| */ |
| private class NetworkBoundSocketFactory extends SocketFactory { |
| private final int mNetId; |
| |
| public NetworkBoundSocketFactory(int netId) { |
| super(); |
| mNetId = netId; |
| } |
| |
| private void connectToHost(Socket socket, String host, int port) throws IOException { |
| // Lookup addresses only on this Network. |
| InetAddress[] hostAddresses = getAllByName(host); |
| // Try all but last address ignoring exceptions. |
| for (int i = 0; i < hostAddresses.length - 1; i++) { |
| try { |
| socket.connect(new InetSocketAddress(hostAddresses[i], port)); |
| return; |
| } catch (IOException e) { |
| } |
| } |
| // Try last address. Do throw exceptions. |
| socket.connect(new InetSocketAddress(hostAddresses[hostAddresses.length - 1], port)); |
| } |
| |
| @Override |
| public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException { |
| Socket socket = createSocket(); |
| socket.bind(new InetSocketAddress(localHost, localPort)); |
| connectToHost(socket, host, port); |
| return socket; |
| } |
| |
| @Override |
| public Socket createSocket(InetAddress address, int port, InetAddress localAddress, |
| int localPort) throws IOException { |
| Socket socket = createSocket(); |
| socket.bind(new InetSocketAddress(localAddress, localPort)); |
| socket.connect(new InetSocketAddress(address, port)); |
| return socket; |
| } |
| |
| @Override |
| public Socket createSocket(InetAddress host, int port) throws IOException { |
| Socket socket = createSocket(); |
| socket.connect(new InetSocketAddress(host, port)); |
| return socket; |
| } |
| |
| @Override |
| public Socket createSocket(String host, int port) throws IOException { |
| Socket socket = createSocket(); |
| connectToHost(socket, host, port); |
| return socket; |
| } |
| |
| @Override |
| public Socket createSocket() throws IOException { |
| Socket socket = new Socket(); |
| // Query a property of the underlying socket to ensure the underlying |
| // socket exists so a file descriptor is available to bind to a network. |
| socket.getReuseAddress(); |
| if (!NetworkUtils.bindSocketToNetwork(socket.getFileDescriptor$().getInt$(), mNetId)) { |
| throw new SocketException("Failed to bind socket to network."); |
| } |
| return socket; |
| } |
| } |
| |
| /** |
| * Returns a {@link SocketFactory} bound to this network. Any {@link Socket} created by |
| * this factory will have its traffic sent over this {@code Network}. Note that if this |
| * {@code Network} ever disconnects, this factory and any {@link Socket} it produced in the |
| * past or future will cease to work. |
| * |
| * @return a {@link SocketFactory} which produces {@link Socket} instances bound to this |
| * {@code Network}. |
| */ |
| public SocketFactory getSocketFactory() { |
| if (mNetworkBoundSocketFactory == null) { |
| mNetworkBoundSocketFactory = new NetworkBoundSocketFactory(netId); |
| } |
| return mNetworkBoundSocketFactory; |
| } |
| |
| // implement the Parcelable interface |
| public int describeContents() { |
| return 0; |
| } |
| public void writeToParcel(Parcel dest, int flags) { |
| dest.writeInt(netId); |
| } |
| |
| public static final Creator<Network> CREATOR = |
| new Creator<Network>() { |
| public Network createFromParcel(Parcel in) { |
| int netId = in.readInt(); |
| |
| return new Network(netId); |
| } |
| |
| public Network[] newArray(int size) { |
| return new Network[size]; |
| } |
| }; |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof Network == false) return false; |
| Network other = (Network)obj; |
| return this.netId == other.netId; |
| } |
| |
| @Override |
| public int hashCode() { |
| return netId * 11; |
| } |
| |
| @Override |
| public String toString() { |
| return Integer.toString(netId); |
| } |
| } |