1 /*
   2  * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any

  39  * It is used to identify the local interface on which a multicast group
  40  * is joined.
  41  *
  42  * Interfaces are normally known by names such as "le0".
  43  *
  44  * @since 1.4
  45  */
  46 public final class NetworkInterface {
  47     private String name;
  48     private String displayName;
  49     private int index;
  50     private InetAddress addrs[];
  51     private InterfaceAddress bindings[];
  52     private NetworkInterface childs[];
  53     private NetworkInterface parent = null;
  54     private boolean virtual = false;
  55     private static final NetworkInterface defaultInterface;
  56     private static final int defaultIndex; /* index of defaultInterface */
  57 
  58     static {
  59         jdk.internal.loader.BootLoader.loadLibrary("net");
  60 
  61         init();
  62         defaultInterface = DefaultInterface.getDefault();
  63         if (defaultInterface != null) {
  64             defaultIndex = defaultInterface.getIndex();
  65         } else {
  66             defaultIndex = 0;
  67         }
  68     }
  69 
  70     /**
  71      * Returns an NetworkInterface object with index set to 0 and name to null.
  72      * Setting such an interface on a MulticastSocket will cause the
  73      * kernel to choose one interface for sending multicast packets.
  74      *
  75      */
  76     NetworkInterface() {
  77     }
  78 
  79     NetworkInterface(String name, int index, InetAddress[] addrs) {

   1 /*
   2  * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any

  39  * It is used to identify the local interface on which a multicast group
  40  * is joined.
  41  *
  42  * Interfaces are normally known by names such as "le0".
  43  *
  44  * @since 1.4
  45  */
  46 public final class NetworkInterface {
  47     private String name;
  48     private String displayName;
  49     private int index;
  50     private InetAddress addrs[];
  51     private InterfaceAddress bindings[];
  52     private NetworkInterface childs[];
  53     private NetworkInterface parent = null;
  54     private boolean virtual = false;
  55     private static final NetworkInterface defaultInterface;
  56     private static final int defaultIndex; /* index of defaultInterface */
  57 
  58     static {
  59         sun.security.action.LoadLibraryAction.privilegedLoadLibrary("net");
  60 
  61         init();
  62         defaultInterface = DefaultInterface.getDefault();
  63         if (defaultInterface != null) {
  64             defaultIndex = defaultInterface.getIndex();
  65         } else {
  66             defaultIndex = 0;
  67         }
  68     }
  69 
  70     /**
  71      * Returns an NetworkInterface object with index set to 0 and name to null.
  72      * Setting such an interface on a MulticastSocket will cause the
  73      * kernel to choose one interface for sending multicast packets.
  74      *
  75      */
  76     NetworkInterface() {
  77     }
  78 
  79     NetworkInterface(String name, int index, InetAddress[] addrs) {