1 /*
   2  * Copyright (c) 2015, 2018, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8133196
  27  * @summary test functionality of getOriginalHostName(InetAddress)
  28  * @modules java.base/jdk.internal.access
  29  */
  30 
  31 import java.net.InetAddress;
  32 
  33 import jdk.internal.access.JavaNetInetAddressAccess;
  34 import jdk.internal.access.SharedSecrets;
  35 
  36 public class getOriginalHostName {
  37 
  38     private static final JavaNetInetAddressAccess jna =
  39         SharedSecrets.getJavaNetInetAddressAccess();
  40 
  41     public static void main(String[] args) throws Exception {
  42         final String HOST = "dummyserver.java.net";
  43         InetAddress ia = null;
  44         ia = InetAddress.getByName(HOST);
  45         testInetAddress(ia, HOST);
  46         ia = InetAddress.getByName("255.255.255.0");
  47         testInetAddress(ia, null);
  48         ia = InetAddress.getByAddress(new byte[]{1,1,1,1});
  49         testInetAddress(ia, null);
  50         ia = InetAddress.getLocalHost();
  51         testInetAddress(ia, ia.getHostName());
  52         ia = InetAddress.getLoopbackAddress();
  53         testInetAddress(ia, ia.getHostName());
  54     }
  55 
  56 
  57     private static void testInetAddress(InetAddress ia, String expected)
  58         throws Exception {
  59 
  60         System.out.println("Testing InetAddress: " + ia);
  61         System.out.println("Expecting original hostname of : " + expected);
  62         String origHostName = jna.getOriginalHostName(ia);
  63         System.out.println("via JavaNetAccess: " + origHostName);
  64         if (origHostName == null && expected != null) {
  65             throw new RuntimeException("Unexpected null. Testing:" + expected);
  66         } else if (expected != null && !origHostName.equals(expected)) {
  67             throw new RuntimeException("Unexpected hostname :" + origHostName);
  68         } else if (expected == null && origHostName != null) {
  69             throw new RuntimeException("Unexpected origHostName: " + origHostName);
  70         }
  71     }
  72 }