jdk/src/share/classes/java/net/Inet6AddressImpl.java
author michaelm
Wed, 13 Feb 2013 10:40:31 +0000
changeset 16870 f35b2bd19761
parent 10596 39b3a979e600
child 23010 6dadb192ad81
permissions -rw-r--r--
8000724: Improve networking serialization Summary: delegate InetAddress fields to a holder object Reviewed-by: alanb, chegar
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/*
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 * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package java.net;
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import java.io.IOException;
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/*
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 * Package private implementation of InetAddressImpl for dual
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 * IPv4/IPv6 stack.
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 * <p>
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 * If InetAddress.preferIPv6Address is true then anyLocalAddress(),
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 * loopbackAddress(), and localHost() will return IPv6 addresses,
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 * otherwise IPv4 addresses.
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 *
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 * @since 1.4
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 */
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class Inet6AddressImpl implements InetAddressImpl {
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    public native String getLocalHostName() throws UnknownHostException;
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    public native InetAddress[]
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        lookupAllHostAddr(String hostname) throws UnknownHostException;
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    public native String getHostByAddr(byte[] addr) throws UnknownHostException;
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    private native boolean isReachable0(byte[] addr, int scope, int timeout, byte[] inf, int ttl, int if_scope) throws IOException;
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    public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
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        byte[] ifaddr = null;
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        int scope = -1;
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        int netif_scope = -1;
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        if (netif != null) {
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            /*
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             * Let's make sure we bind to an address of the proper family.
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             * Which means same family as addr because at this point it could
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             * be either an IPv6 address or an IPv4 address (case of a dual
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             * stack system).
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             */
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            java.util.Enumeration<InetAddress> it = netif.getInetAddresses();
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            InetAddress inetaddr = null;
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            while (it.hasMoreElements()) {
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                inetaddr = it.nextElement();
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                if (inetaddr.getClass().isInstance(addr)) {
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                    ifaddr = inetaddr.getAddress();
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                    if (inetaddr instanceof Inet6Address) {
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                        netif_scope = ((Inet6Address) inetaddr).getScopeId();
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                    }
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                    break;
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                }
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            }
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            if (ifaddr == null) {
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                // Interface doesn't support the address family of
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                // the destination
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                return false;
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            }
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        }
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        if (addr instanceof Inet6Address)
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            scope = ((Inet6Address) addr).getScopeId();
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        return isReachable0(addr.getAddress(), scope, timeout, ifaddr, ttl, netif_scope);
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    }
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    public synchronized InetAddress anyLocalAddress() {
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        if (anyLocalAddress == null) {
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            if (InetAddress.preferIPv6Address) {
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                anyLocalAddress = new Inet6Address();
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                anyLocalAddress.holder().hostName = "::";
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            } else {
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                anyLocalAddress = (new Inet4AddressImpl()).anyLocalAddress();
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            }
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        }
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        return anyLocalAddress;
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    }
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    public synchronized InetAddress loopbackAddress() {
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        if (loopbackAddress == null) {
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             if (InetAddress.preferIPv6Address) {
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                 byte[] loopback =
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                        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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                         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
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                 loopbackAddress = new Inet6Address("localhost", loopback);
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             } else {
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                loopbackAddress = (new Inet4AddressImpl()).loopbackAddress();
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             }
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        }
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        return loopbackAddress;
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    }
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    private InetAddress      anyLocalAddress;
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    private InetAddress      loopbackAddress;
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}