1 /*
2  * Copyright (c) 2015, Red Hat, Inc.
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
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22  */
23 
24 import java.lang.reflect.Field;
25 import java.util.Hashtable;
26 
27 import javax.naming.Context;
28 import javax.naming.NamingException;
29 import javax.naming.spi.NamingManager;
30 
31 import com.sun.jndi.dns.DnsContext;
32 
33 /**
34  * @test
35  * @bug 6991580
36  * @summary IPv6 Nameservers in resolv.conf throws NumberFormatException
37  * @run main/manual IPv6NameserverPlatformParsingTest
38  *
39  * In order to run this test be sure to place, for example, the following
40  * snippet into your platform's {@code /etc/resolv.conf}:
41  * <pre>
42  * nameserver 127.0.0.1
43  * nameserver 2001:4860:4860::8888
44  * nameserver [::1]:5353
45  * nameserver 127.0.0.1:5353
46  * </pre>
47  *
48  * Then, run this test as manual jtreg test.
49  *
50  * @author Severin Gehwolf
51  *
52  */
53 public class IPv6NameserverPlatformParsingTest {
54 
55     private static boolean foundIPv6 = false;
56 
main(String[] args)57     public static void main(String[] args) {
58         Hashtable<String, String> env = new Hashtable<>();
59         env.put(Context.INITIAL_CONTEXT_FACTORY, com.sun.jndi.dns.DnsContextFactory.class.getName());
60 
61         String[] servers;
62         try {
63             Context ctx = NamingManager.getInitialContext(env);
64             if (!com.sun.jndi.dns.DnsContextFactory.platformServersAvailable()) {
65                 throw new RuntimeException("FAIL: no platform servers available, test does not make sense");
66             }
67             DnsContext context = (DnsContext)ctx;
68             servers = getServersFromContext(context);
69         } catch (NamingException e) {
70             throw new RuntimeException(e);
71         }
72         for (String server: servers) {
73             System.out.println("DEBUG: 'nameserver = " + server + "'");
74             if (server.indexOf(':') >= 0 && server.indexOf('.') < 0) {
75                 System.out.println("DEBUG: ==> Found IPv6 address in servers list: " + server);
76                 foundIPv6 = true;
77             }
78         }
79         try {
80             new com.sun.jndi.dns.DnsClient(servers, 100, 1);
81         } catch (NumberFormatException e) {
82             throw new RuntimeException("FAIL: Tried to parse non-[]-encapsulated IPv6 address.", e);
83         } catch (Exception e) {
84             throw new RuntimeException("ERROR: Something unexpected happened.");
85         }
86         if (!foundIPv6) {
87             // This is a manual test, since it requires changing /etc/resolv.conf on Linux/Unix
88             // platforms. See comment as to how to run this test.
89             throw new RuntimeException("ERROR: No IPv6 address returned from platform.");
90         }
91         System.out.println("PASS: Found IPv6 address and DnsClient parsed it correctly.");
92     }
93 
getServersFromContext(DnsContext context)94     private static String[] getServersFromContext(DnsContext context) {
95         try {
96             Field serversField = DnsContext.class.getDeclaredField("servers");
97             serversField.setAccessible(true);
98             return (String[])serversField.get(context);
99         } catch (Exception e) {
100             throw new RuntimeException(e);
101         }
102     }
103 
104 }
105