| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.kerby.kerberos.kerb.transport; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.net.ServerSocket; |
| import java.net.Socket; |
| import java.net.SocketTimeoutException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.DatagramChannel; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * A combined and mixed network server handling UDP and TCP. |
| */ |
| @SuppressWarnings("PMD") |
| public abstract class KdcNetwork { |
| protected static final int MAX_MESSAGE_SIZE = 65507; |
| private static final int KDC_TCP_TRANSPORT_TIMEOUT = 3 * 1000; |
| private static final int KDC_TCP_SERVER_TIMEOUT = 100; |
| private TransportPair tpair; |
| private boolean isStopped; |
| private ServerSocket tcpServer; |
| private DatagramChannel udpServer; |
| private Map<InetSocketAddress, KdcUdpTransport> transports = |
| new HashMap<InetSocketAddress, KdcUdpTransport>(); |
| private ByteBuffer recvBuffer; |
| |
| public void init() { |
| isStopped = false; |
| } |
| |
| public void listen(TransportPair tpair) throws IOException { |
| this.tpair = tpair; |
| |
| tcpServer = new ServerSocket(); |
| tcpServer.setSoTimeout(KDC_TCP_SERVER_TIMEOUT); |
| tcpServer.bind(tpair.tcpAddress); |
| |
| if (tpair.udpAddress != null) { |
| udpServer = DatagramChannel.open(); |
| udpServer.configureBlocking(false); |
| udpServer.bind(tpair.udpAddress); |
| recvBuffer = ByteBuffer.allocate(MAX_MESSAGE_SIZE); |
| } |
| } |
| |
| public void start() { |
| new Thread(new Runnable() { |
| @Override |
| public void run() { |
| KdcNetwork.this.run(); |
| } |
| }).start(); |
| } |
| |
| //CHECKSTYLE:OFF |
| private void run() { |
| while (true) { |
| synchronized (this) { |
| if (isStopped) { |
| break; |
| } |
| } |
| |
| if (tpair.tcpAddress != null) { |
| try { |
| checkAndAccept(); |
| } catch (SocketTimeoutException e) { //NOPMD |
| //NOOP as normal |
| } catch (IOException e) { |
| throw new RuntimeException("Error occured while checking tcp connections", e); |
| } |
| } |
| |
| if (tpair.udpAddress != null) { |
| try { |
| checkUdpMessage(); |
| } catch (SocketTimeoutException e) { //NOPMD |
| //NOOP as normal |
| } catch (IOException e) { |
| throw new RuntimeException("Error occured while checking udp connections", e); |
| } |
| } |
| } |
| } |
| //CHECKSTYLE:ON |
| |
| public synchronized void stop() { |
| // TODO: waiting the network closed. |
| try { |
| Thread.sleep(1000); |
| } catch (InterruptedException e) { |
| e.printStackTrace(); |
| } |
| isStopped = true; |
| } |
| |
| private void checkAndAccept() throws IOException { |
| Socket socket; |
| if ((socket = tcpServer.accept()) != null) { |
| socket.setSoTimeout(KDC_TCP_TRANSPORT_TIMEOUT); |
| KrbTransport transport = new KrbTcpTransport(socket); |
| onNewTransport(transport); |
| } |
| } |
| |
| |
| private void checkUdpMessage() throws IOException { |
| InetSocketAddress fromAddress = (InetSocketAddress) udpServer.receive(recvBuffer); |
| if (fromAddress != null) { |
| recvBuffer.flip(); |
| KdcUdpTransport transport = transports.get(fromAddress); |
| if (transport == null) { |
| transport = new KdcUdpTransport(udpServer, fromAddress); |
| transport.onRecvMessage(recvBuffer); |
| onNewTransport(transport); |
| } else { |
| transport.onRecvMessage(recvBuffer); |
| } |
| recvBuffer = ByteBuffer.allocate(MAX_MESSAGE_SIZE); |
| } |
| } |
| |
| protected abstract void onNewTransport(KrbTransport transport); |
| } |