| /* |
| * 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.net.ipsec.ike.IkeManager.getIkeLog; |
| |
| import android.net.Network; |
| import android.os.Handler; |
| import android.system.ErrnoException; |
| import android.system.Os; |
| import android.util.LongSparseArray; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| import java.net.InetAddress; |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| |
| /** IkeUdpSocket is an abstract superclass for all non-encapsulating IKE UDP sockets. */ |
| public abstract class IkeUdpSocket extends IkeSocket { |
| private static final String TAG = IkeUdpSocket.class.getSimpleName(); |
| |
| protected static IPacketReceiver sPacketReceiver = new PacketReceiver(); |
| |
| // FileDescriptor for sending and receving IKE packet. |
| protected final FileDescriptor mSocket; |
| |
| protected IkeUdpSocket(FileDescriptor socket, Network network, Handler handler) { |
| super(network, handler); |
| mSocket = socket; |
| } |
| |
| /** Get FileDescriptor for use with the packet reader polling loop */ |
| @Override |
| protected FileDescriptor getFd() { |
| return mSocket; |
| } |
| |
| /** Package private */ |
| @VisibleForTesting |
| static final class PacketReceiver implements IkeSocket.IPacketReceiver { |
| public void handlePacket( |
| byte[] recvbuf, LongSparseArray<IkeSessionStateMachine> spiToIkeSession) { |
| ByteBuffer byteBuffer = ByteBuffer.wrap(recvbuf); |
| |
| // Re-direct IKE packet to IkeSessionStateMachine according to the locally generated |
| // IKE SPI. |
| byte[] ikePacketBytes = new byte[byteBuffer.remaining()]; |
| byteBuffer.get(ikePacketBytes); |
| parseAndDemuxIkePacket(ikePacketBytes, spiToIkeSession, TAG); |
| } |
| } |
| |
| /** Package private */ |
| @VisibleForTesting |
| static void setPacketReceiver(IkeSocket.IPacketReceiver receiver) { |
| sPacketReceiver = receiver; |
| } |
| |
| /** |
| * Handle received IKE packet. Invoked when there is a read event. Any desired copies of |
| * |recvbuf| should be made in here, as the underlying byte array is reused across all reads. |
| */ |
| @Override |
| protected void handlePacket(byte[] recvbuf, int length) { |
| sPacketReceiver.handlePacket(Arrays.copyOfRange(recvbuf, 0, length), mSpiToIkeSession); |
| } |
| |
| /** |
| * Send encoded IKE packet to destination address |
| * |
| * @param ikePacket encoded IKE packet |
| * @param serverAddress IP address of remote server |
| */ |
| @Override |
| public void sendIkePacket(byte[] ikePacket, InetAddress serverAddress) { |
| getIkeLog() |
| .d( |
| this.getClass().getSimpleName(), |
| "Sending packet to " |
| + serverAddress.getHostAddress() |
| + "( " |
| + ikePacket.length |
| + " bytes)"); |
| try { |
| ByteBuffer buffer = ByteBuffer.wrap(ikePacket); |
| |
| // Use unconnected UDP socket because one {@IkeUdpSocket} may be shared by |
| // multiple IKE sessions that send messages to different destinations. |
| Os.sendto(mSocket, buffer, 0, serverAddress, getIkeServerPort()); |
| } catch (ErrnoException | IOException e) { |
| getIkeLog() |
| .i( |
| this.getClass().getSimpleName(), |
| "Failed to send packet on network " + getNetwork(), |
| e); |
| } |
| } |
| |
| @Override |
| public int getIkeServerPort() { |
| return SERVER_PORT_NON_UDP_ENCAPSULATED; |
| } |
| |
| /** Implement {@link AutoCloseable#close()} */ |
| @Override |
| public void close() { |
| try { |
| Os.close(mSocket); |
| } catch (ErrnoException e) { |
| getIkeLog() |
| .e( |
| this.getClass().getSimpleName(), |
| "Failed to close UDP Encapsulation Socket for Network " + getNetwork()); |
| } |
| |
| // PacketReader unregisters file descriptor from listener on thread with which the Handler |
| // constructor argument is associated. |
| super.close(); |
| } |
| } |