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