1 /*
2 * Copyright (c) 2002, 2011, 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 /* @test
25 * @bug 4292867
26 * @summary Check that InetAddress doesn't continue to throw UHE
27 * after the name service has recovered and the negative ttl
28 * on the initial lookup has expired.
29 * @compile -XDignore.symbol.file=true SimpleNameService.java
30 * SimpleNameServiceDescriptor.java
31 * @run main/othervm/timeout=200 -Dsun.net.spi.nameservice.provider.1=simple,sun CacheTest
32 */
33 import java.net.InetAddress;
34 import java.net.UnknownHostException;
35 import java.security.Security;
36
37 public class CacheTest {
38
39
40 public static void main(String args[]) throws Exception {
41
42 /*
43 * First check the ttl on negative lookups is in the <15 second
44 * range. If the ttl is <=0 it means we cache forever or always
45 * consult the name service. For ttl > 15 the test would take
46 * too long so we skip it (need to coordinate jtreg timeout
47 * with negative ttl)
48 */
49 String ttlProp = "networkaddress.cache.negative.ttl";
50 int ttl = 0;
51 String policy = Security.getProperty(ttlProp);
52 if (policy != null) {
53 ttl = Integer.parseInt(policy);
54 }
55 if (ttl <= 0 || ttl > 15) {
56 System.err.println("Security property " + ttlProp + " needs to " +
57 " in 1-15 second range to execute this test");
58 return;
59
60 }
61
62 /*
63 * The following outlines how the test works :-
64 *
65 * 1. Do a lookup via InetAddress.getByName that it guaranteed
66 * to succeed. This forces at least one entry into the cache
67 * that will not expire.
68 *
69 * 2. Do a lookup via InetAddress.getByName that is guarnateed
70 * to fail. This results in a negative lookup cached for
71 * for a short period to time.
72 *
73 * 3. Wait for the cache entry to expire.
74 *
75 * 4. Do a lookup (which should consult the name service) and
76 * the lookup should succeed.
77 */
78
79 // name service needs to resolve this.
80 SimpleNameService.put("theclub", "129.156.220.219");
81
82 // this lookup will succeed
83 InetAddress.getByName("theclub");
84
85 // lookup "luster" - this should throw UHE as name service
86 // doesn't know anything about this host.
87
88 try {
89 InetAddress.getByName("luster");
90 throw new RuntimeException("Test internal error " +
91 " - luster is bring resolved by name service");
92 } catch (UnknownHostException x) {
93 }
94
95 // name service now needs to know about luster
96 SimpleNameService.put("luster", "10.5.18.21");
97
98 // wait for the cache entry to expire and lookup should
99 // succeed.
100 Thread.currentThread().sleep(ttl*1000 + 1000);
101 InetAddress.getByName("luster");
102 }
103
104 }