| /* |
| * Copyright (C) 2020 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.internal.net.ipsec.ike; |
| |
| import static android.system.OsConstants.AF_INET; |
| import static android.system.OsConstants.IPPROTO_UDP; |
| import static android.system.OsConstants.SOCK_DGRAM; |
| |
| import android.net.InetAddresses; |
| import android.net.TrafficStats; |
| import android.os.Handler; |
| import android.system.ErrnoException; |
| import android.system.Os; |
| |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| import java.net.InetAddress; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * IkeUdp4Socket uses an IPv4-bound {@link FileDescriptor} to send and receive IKE packets. |
| * |
| * <p>Caller MUST provide one IkeSocketConfig when trying to get an instance of IkeUdp4Socket. Each |
| * IkeSocketConfig will only be bound to by one IkeUdp4Socket instance. When caller requests an |
| * IkeUdp4Socket with an already bound IkeSocketConfig, the existing instance will be returned. |
| */ |
| public final class IkeUdp4Socket extends IkeUdpSocket { |
| private static final String TAG = IkeUdp4Socket.class.getSimpleName(); |
| |
| private static final InetAddress INADDR_ANY = InetAddresses.parseNumericAddress("0.0.0.0"); |
| |
| // Map from IkeSocketConfig to IkeUdp4Socket instances. |
| private static Map<IkeSocketConfig, IkeUdp4Socket> sConfigToSocketMap = new HashMap<>(); |
| |
| private IkeUdp4Socket(FileDescriptor socket, IkeSocketConfig sockConfig, Handler handler) { |
| super(socket, sockConfig, handler == null ? new Handler() : handler); |
| } |
| |
| /** |
| * Get an IkeUdp4Socket instance. |
| * |
| * <p>Return the existing IkeUdp4Socket instance if it has been created for the input |
| * IkeSocketConfig. Otherwise, create and return a new IkeUdp4Socket instance. |
| * |
| * @param sockConfig the socket configuration |
| * @param callback the callback for signalling IkeSocket events |
| * @param handler the Handler used to process received packets |
| * @return an IkeUdp4Socket instance |
| */ |
| public static IkeUdp4Socket getInstance( |
| IkeSocketConfig sockConfig, IkeSocket.Callback callback, Handler handler) |
| throws ErrnoException, IOException { |
| IkeUdp4Socket ikeSocket = sConfigToSocketMap.get(sockConfig); |
| if (ikeSocket == null) { |
| FileDescriptor sock = Os.socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| TrafficStats.tagFileDescriptor(sock); |
| Os.bind(sock, INADDR_ANY, 0); |
| applySocketConfig(sockConfig, sock, false /* isIpv6 */); |
| |
| ikeSocket = new IkeUdp4Socket(sock, sockConfig, handler); |
| |
| // Create and register FileDescriptor for receiving IKE packet on current thread. |
| ikeSocket.start(); |
| |
| sConfigToSocketMap.put(sockConfig, ikeSocket); |
| } |
| ikeSocket.mRegisteredCallbacks.add(callback); |
| return ikeSocket; |
| } |
| |
| /** Implement {@link AutoCloseable#close()} */ |
| @Override |
| public void close() { |
| sConfigToSocketMap.remove(getIkeSocketConfig()); |
| |
| super.close(); |
| } |
| } |