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