libjava/classpath/vm/reference/java/net/VMNetworkInterface.java

   1 /* VMNetworkInterface.java --
   2    Copyright (C) 2005, 2008  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.nio.ByteBuffer;
  44 import java.util.HashSet;
  45 import java.util.Set;
  46
  47 /**
  48  * This class models a network interface on the host computer.  A network
  49  * interface contains a name (typically associated with a specific
  50  * hardware adapter) and a list of addresses that are bound to it.
  51  * For example, an ethernet interface may be named "eth0" and have the
  52  * address 192.168.1.101 assigned to it.
  53  *
  54  * @author Michael Koch (konqueror@gmx.de)
  55  * @since 1.4
  56  */
  57 final class VMNetworkInterface
  58 {
  59   String name;
  60   Set addresses;
  61
  62   VMNetworkInterface(String name)
  63   {
  64     this.name = name;
  65     addresses = new HashSet();
  66   }
  67
  68   /**
  69    * Creates a dummy instance which represents any network
  70    * interface.
  71    */
  72   public VMNetworkInterface()
  73   {
  74     addresses = new HashSet();
  75     try
  76       {
  77         addresses.add(InetAddress.getByName("0.0.0.0"));
  78       }
  79     catch (UnknownHostException _)
  80       {
  81         // Cannot happen.
  82       }
  83   }
  84
  85   static
  86   {
  87     if (Configuration.INIT_LOAD_LIBRARY)
  88       System.loadLibrary("javanet");
  89
  90     initIds();
  91   }
  92
  93   private static native void initIds();
  94
  95   /**
  96    * Return a list of VM network interface objects.
  97    *
  98    * @return The list of network interfaces.
  99    * @throws SocketException
 100    */
 101   public static native VMNetworkInterface[] getVMInterfaces()
 102     throws SocketException;
 103
 104   private void addAddress(ByteBuffer addr)
 105     throws SocketException, UnknownHostException
 106   {
 107     if (addr.remaining() == 4)
 108       {
 109         byte[] ipv4 = new byte[4];
 110         addr.get(ipv4);
 111         addresses.add(Inet4Address.getByAddress(ipv4));
 112       }
 113     else if (addr.remaining() == 16)
 114       {
 115         byte[] ipv6 = new byte[16];
 116         addr.get(ipv6);
 117         addresses.add(Inet6Address.getByAddress(ipv6));
 118       }
 119     else
 120       throw new SocketException("invalid interface address");
 121   }
 122
 123   static native boolean isUp(String name) throws SocketException;
 124
 125   static native boolean isLoopback(String name) throws SocketException;
 126
 127   static native boolean isPointToPoint(String name) throws SocketException;
 128
 129   static native boolean supportsMulticast(String name) throws SocketException;
 130
 131 }