1 /* 2 * Copyright (c) 2002, 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 }