1 /*
   2  * Copyright (c) 2002, 2016, 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  * Lookup/reverse lookup class for regression test 4773521
  26  * @test
  27  * @bug 4773521
  28  * @summary Test that reverse lookups of IPv4 addresses work when IPv6
  29  *          is enabled
  30  * @library /test/lib
  31  * @build jdk.test.lib.Utils
  32  *        jdk.test.lib.Asserts
  33  *        jdk.test.lib.JDKToolFinder
  34  *        jdk.test.lib.JDKToolLauncher
  35  *        jdk.test.lib.Platform
  36  *        jdk.test.lib.process.*
  37  *        Lookup
  38  * @run main Lookup root
  39  *
  40  */
  41 import java.io.IOException;
  42 import java.net.InetAddress;
  43 import java.net.UnknownHostException;
  44 import java.util.List;
  45 
  46 import jdk.test.lib.JDKToolFinder;
  47 import jdk.test.lib.process.OutputAnalyzer;
  48 
  49 public class Lookup {
  50     private static final String HOST = "icann.org";
  51     private static final String SKIP = "SKIP";
  52     private static final String CLASS_PATH = System.getProperty(
  53             "test.class.path");
  54 
  55     public static void main(String args[]) throws IOException {
  56         String addr = null;
  57         String ipv4Name = null;
  58         if (args.length == 0) {
  59             // First check that host resolves to IPv4 address
  60             try {
  61                 InetAddress ia = InetAddress.getByName(HOST);
  62                 addr = ia.getHostAddress();
  63             } catch (UnknownHostException e) {
  64                 System.out.print(SKIP);
  65                 return;
  66             }
  67         } else {
  68             String tmp = lookupWithIPv4Prefer();
  69             System.out.println("IPv4 lookup results: [" + tmp + "]");
  70             if (SKIP.equals(tmp)) {
  71                 System.out.println(HOST + " can't be resolved - test skipped.");
  72                 return;
  73             }
  74 
  75             String[] strs = tmp.split(":");
  76             addr = strs[0];
  77             ipv4Name = strs[1];
  78         }
  79 
  80         // reverse lookup
  81         InetAddress ia = InetAddress.getByName(addr);
  82         String name = ia.getHostName();
  83         if (args.length == 0) {
  84             System.out.print(addr + ":" + name);
  85             return;
  86         } else {
  87             System.out.println("(default) " + addr + "--> " + name);
  88             if (!ipv4Name.equals(name)) {
  89                 throw new RuntimeException("Mismatch between default"
  90                         + " and java.net.preferIPv4Stack=true results");
  91             }
  92         }
  93     }
  94 
  95     static String lookupWithIPv4Prefer() throws IOException {
  96         String java = JDKToolFinder.getTestJDKTool("java");
  97         String testClz = Lookup.class.getName();
  98         List<String> cmd = List.of(java, "-Djava.net.preferIPv4Stack=true",
  99                 "-cp", CLASS_PATH, testClz);
 100         System.out.println("Executing: " + cmd);
 101         return new OutputAnalyzer(new ProcessBuilder(cmd).start()).getOutput();
 102     }
 103 }
 104