1 /*

     2  * Copyright (c) 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  * @test

    26  * @bug 8016521

    27  * @summary InetAddress should not always re-order addresses returned from name

    28  *          service

    29  * @run main/othervm -Djava.net.preferIPv6Addresses=false PreferIPv6AddressesTest

    30  * @run main/othervm -Djava.net.preferIPv6Addresses=true PreferIPv6AddressesTest

    31  * @run main/othervm -Djava.net.preferIPv6Addresses=system PreferIPv6AddressesTest

    32  * @run main/othervm PreferIPv6AddressesTest

    33  */

    34 

    35 import java.io.IOException;

    36 import java.net.*;

    37 import java.nio.channels.DatagramChannel;

    38 import java.util.Arrays;

    39 import java.util.stream.IntStream;

    40 import static java.lang.System.out;

    41 

    42 public class PreferIPv6AddressesTest {

    43 

    44     // A name, that if resolves, returns both IPv4 and IPv6 addresses.

    45     static final String HOST_NAME = "www.google.com";

    46 

    47     static final InetAddress LOOPBACK = InetAddress.getLoopbackAddress();

    48 

    49     static final String preferIPV6Address =

    50             System.getProperty("java.net.preferIPv6Addresses", "false");

    51 

    52     public static void main(String args[]) throws IOException {

    53 

    54         InetAddress addrs[];

    55         try {

    56             addrs = InetAddress.getAllByName(HOST_NAME);

    57         } catch (UnknownHostException e) {

    58             out.println("Unknown host " + HOST_NAME + ", cannot run test.");

    59             return;

    60         }

    61 

    62         int firstIPv4Address = IntStream.range(0, addrs.length)

    63                 .filter(x -> addrs[x] instanceof Inet4Address)

    64                 .findFirst().orElse(-1);

    65         int firstIPv6Address = IntStream.range(0, addrs.length)

    66                 .filter(x -> addrs[x] instanceof Inet6Address)

    67                 .findFirst().orElse(-1);

    68 

    69         out.println("IPv6 supported: " + IPv6Supported());

    70         out.println("Addresses: " + Arrays.asList(addrs));

    71 

    72         if (preferIPV6Address.equalsIgnoreCase("true") && firstIPv6Address != -1) {

    73             int off = firstIPv4Address != -1 ? firstIPv4Address : addrs.length;

    74             assertAllv6Addresses(addrs, 0, off);

    75             assertAllv4Addresses(addrs, off, addrs.length);

    76             assertLoopbackAddress(Inet6Address.class);

    77             assertAnyLocalAddress(Inet6Address.class);

    78         } else if (preferIPV6Address.equalsIgnoreCase("false") && firstIPv4Address != -1) {

    79             int off = firstIPv6Address != -1 ? firstIPv6Address : addrs.length;

    80             assertAllv4Addresses(addrs, 0, off);

    81             assertAllv6Addresses(addrs, off, addrs.length);

    82             assertLoopbackAddress(Inet4Address.class);

    83             assertAnyLocalAddress(Inet4Address.class);

    84         } else if (preferIPV6Address.equalsIgnoreCase("system") && IPv6Supported()) {

    85             assertLoopbackAddress(Inet6Address.class);

    86             assertAnyLocalAddress(Inet6Address.class);

    87         } else if (preferIPV6Address.equalsIgnoreCase("system") && !IPv6Supported()) {

    88             assertLoopbackAddress(Inet4Address.class);

    89             assertAnyLocalAddress(Inet4Address.class);

    90         }

    91     }

    92 

    93     static void assertAllv4Addresses(InetAddress[] addrs, int off, int len) {

    94         IntStream.range(off, len)

    95                  .mapToObj(x -> addrs[x])

    96                  .forEach(x -> {

    97                      if (!(x instanceof Inet4Address))

    98                          throw new RuntimeException("Expected IPv4, got " + x);

    99                  });

   100     }

   101 

   102     static void assertAllv6Addresses(InetAddress[] addrs, int off, int len) {

   103         IntStream.range(off, len)

   104                 .mapToObj(x -> addrs[x])

   105                 .forEach(x -> {

   106                     if (!(x instanceof Inet6Address))

   107                         throw new RuntimeException("Expected IPv6, got " + x);

   108                 });

   109     }

   110 

   111     static void assertLoopbackAddress(Class<?> expectedType) {

   112         if (!LOOPBACK.getClass().isAssignableFrom(expectedType))

   113             throw new RuntimeException("Expected " + expectedType

   114                     + ", got " + LOOPBACK.getClass());

   115     }

   116 

   117     static void assertAnyLocalAddress(Class<?> expectedType) {

   118         InetAddress anyAddr = (new InetSocketAddress(0)).getAddress();

   119         if (!anyAddr.getClass().isAssignableFrom(expectedType))

   120             throw new RuntimeException("Expected " + expectedType

   121                     + ", got " + anyAddr.getClass());

   122     }

   123 

   124     static boolean IPv6Supported() throws IOException {

   125         try {

   126             DatagramChannel.open(StandardProtocolFamily.INET6);

   127             return true;

   128         } catch (UnsupportedOperationException x) {

   129             return false;

   130         }

   131     }

   132 }