/*
 * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package sun.management.jmxremote;

import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.rmi.server.RMIServerSocketFactory;
import java.util.Enumeration;

This RMI server socket factory creates server sockets that will only accept connection requests from clients running on the host where the RMI remote objects have been exported.
/** * This RMI server socket factory creates server sockets that * will only accept connection requests from clients running * on the host where the RMI remote objects have been exported. */
public final class LocalRMIServerSocketFactory implements RMIServerSocketFactory {
Creates a server socket that only accepts connection requests from clients running on the host where the RMI remote objects have been exported.
/** * Creates a server socket that only accepts connection requests from * clients running on the host where the RMI remote objects have been * exported. */
public ServerSocket createServerSocket(int port) throws IOException { return new ServerSocket(port) { @Override public Socket accept() throws IOException { final Socket socket = super.accept(); final InetAddress remoteAddr = socket.getInetAddress(); final String msg = "The server sockets created using the " + "LocalRMIServerSocketFactory only accept connections " + "from clients running on the host where the RMI " + "remote objects have been exported."; if (remoteAddr == null) { // Though unlikeky, the socket could be already // closed... Send a more detailed message in // this case. Also avoid throwing NullPointerExceptiion // String details = ""; if (socket.isClosed()) { details = " Socket is closed."; } else if (!socket.isConnected()) { details = " Socket is not connected"; } try { socket.close(); } catch (Exception ok) { // ok - this is just cleanup before throwing detailed // exception. } throw new IOException(msg + " Couldn't determine client address." + details); } else if (remoteAddr.isLoopbackAddress()) { // local address: accept the connection. return socket; } // Retrieve all the network interfaces on this host. Enumeration<NetworkInterface> nis; try { nis = NetworkInterface.getNetworkInterfaces(); } catch (SocketException e) { try { socket.close(); } catch (IOException ioe) { // Ignore... } throw new IOException(msg, e); } // Walk through the network interfaces to see // if any of them matches the client's address. // If true, then the client's address is local. while (nis.hasMoreElements()) { NetworkInterface ni = nis.nextElement(); Enumeration<InetAddress> addrs = ni.getInetAddresses(); while (addrs.hasMoreElements()) { InetAddress localAddr = addrs.nextElement(); if (localAddr.equals(remoteAddr)) { return socket; } } } // The client's address is remote so refuse the connection. try { socket.close(); } catch (IOException ioe) { // Ignore... } throw new IOException(msg); } }; }
Two LocalRMIServerSocketFactory objects are equal if they are of the same type.
/** * Two LocalRMIServerSocketFactory objects * are equal if they are of the same type. */
@Override public boolean equals(Object obj) { return (obj instanceof LocalRMIServerSocketFactory); }
Returns a hash code value for this LocalRMIServerSocketFactory.
/** * Returns a hash code value for this LocalRMIServerSocketFactory. */
@Override public int hashCode() { return getClass().hashCode(); } }