libjava/java/net/VMInetAddress.java

   1 /* VMInetAddress.java -- Class to model an Internet address
   2    Copyright (C) 2005  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package java.net;
  40
  41 import gnu.classpath.Configuration;
  42
  43 import java.io.Serializable;
  44
  45 class VMInetAddress implements Serializable
  46 {
  47   static
  48   {
  49     if (Configuration.INIT_LOAD_LIBRARY)
  50       System.loadLibrary("javanet");
  51   }
  52
  53   /**
  54    * This method looks up the hostname of the local machine
  55    * we are on.  If the actual hostname cannot be determined, then the
  56    * value "localhost" will be used.  This native method wrappers the
  57    * "gethostname" function.
  58    *
  59    * @return The local hostname.
  60    */
  61   public static native String getLocalHostname();
  62
  63   /**
  64    * Returns the value of the special address INADDR_ANY
  65    */
  66   public static native byte[] lookupInaddrAny() throws UnknownHostException;
  67
  68   /**
  69    * This method returns the hostname for a given IP address.  It will
  70    * throw an UnknownHostException if the hostname cannot be determined.
  71    *
  72    * @param ip The IP address as a byte array
  73    *
  74    * @return The hostname
  75    *
  76    * @exception UnknownHostException If the reverse lookup fails
  77    */
  78   public static native String getHostByAddr(byte[] ip)
  79     throws UnknownHostException;
  80
  81   /**
  82    * Returns a list of all IP addresses for a given hostname.  Will throw
  83    * an UnknownHostException if the hostname cannot be resolved.
  84    */
  85   public static native byte[][] getHostByName(String hostname)
  86     throws UnknownHostException;
  87
  88   /**
  89    * Return the IP address represented by a literal address.
  90    * Will return null if the literal address is not valid.
  91    *
  92    * @param address the name of the host
  93    *
  94    * @return The IP address as a byte array
  95    */
  96   public static native byte[] aton(String address);
  97 }