jdk/src/share/classes/java/net/Inet4AddressImpl.java
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 2002-2005 Sun Microsystems, Inc.  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.  Sun designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any 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 IPv4.
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 *
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 * @since 1.4
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 */
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class Inet4AddressImpl 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 timeout, byte[] ifaddr, int ttl) throws IOException;
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    public synchronized InetAddress anyLocalAddress() {
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        if (anyLocalAddress == null) {
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            anyLocalAddress = new Inet4Address(); // {0x00,0x00,0x00,0x00}
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            anyLocalAddress.hostName = "0.0.0.0";
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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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            byte[] loopback = {0x7f,0x00,0x00,0x01};
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            loopbackAddress = new Inet4Address("localhost", loopback);
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        }
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        return loopbackAddress;
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    }
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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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      if (netif != null) {
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          /*
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           * Let's make sure we use an address of the proper family
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           */
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          java.util.Enumeration it = netif.getInetAddresses();
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          InetAddress inetaddr = null;
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          while (!(inetaddr instanceof Inet4Address) &&
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                 it.hasMoreElements())
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              inetaddr = (InetAddress) it.nextElement();
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          if (inetaddr instanceof Inet4Address)
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              ifaddr = inetaddr.getAddress();
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      }
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      return isReachable0(addr.getAddress(), timeout, ifaddr, ttl);
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  }
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    private InetAddress      anyLocalAddress;
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    private InetAddress      loopbackAddress;
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}