1/* 2 * Copyright (c) 2006, 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/* @test 25 * @bug 6442088 26 * @summary Change default DNS caching behavior for code not running under 27 * security manager. 28 * @run main/othervm/timeout=200 -Dsun.net.inetaddr.ttl=20 DefaultCaching 29 */ 30import java.net.InetAddress; 31import java.net.UnknownHostException; 32import java.security.Security; 33import java.io.FileWriter; 34import java.io.PrintWriter; 35import java.io.BufferedWriter; 36 37public class DefaultCaching { 38 39 public static void main(String args[]) throws Exception { 40 41 String hostsFileName = System.getProperty("test.src", ".") + "/DefaultCachingHosts"; 42 System.setProperty("jdk.net.hosts.file", hostsFileName); 43 // initial mapping 44 // name service needs to resolve this. 45 addMappingToHostsFile("theclub", "129.156.220.219", hostsFileName, false); 46 47 test ("theclub", "129.156.220.219", true); // lk: 1 48 test ("luster", "1.16.20.2", false); // lk: 2 49 50 // name service now needs to know about luster 51 addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true); 52 53 test ("luster", "1.16.20.2", false); // lk: 2 54 sleep (10+1); 55 test("luster", "10.5.18.21", true, 3); // lk: 3 56 sleep (5); 57 58 // new mapping for theclub and rewrite existing foo and luster mappings 59 addMappingToHostsFile("theclub", "129.156.220.1", hostsFileName, false); 60 addMappingToHostsFile("foo", "10.5.18.22", hostsFileName, true); 61 addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true); 62 63 test ("theclub", "129.156.220.219", true, 3); 64 test ("luster", "10.5.18.21", true, 3); 65 test ("bar", "10.5.18.22", false, 4); 66 test ("foo", "10.5.18.22", true, 5); 67 68 // now delay to see if theclub has expired 69 sleep (5); 70 71 test ("foo", "10.5.18.22", true, 5); 72 test ("theclub", "129.156.220.1", true, 6); 73 74 sleep (11); 75 // now see if luster has expired 76 test ("luster", "10.5.18.21", true, 7); 77 test ("theclub", "129.156.220.1", true, 7); 78 79 // now delay to see if 3rd has expired 80 sleep (10+6); 81 82 test ("theclub", "129.156.220.1", true, 8); 83 test ("luster", "10.5.18.21", true, 8); 84 test ("foo", "10.5.18.22", true, 9); 85 } 86 87 /* throws RuntimeException if it fails */ 88 89 static void test (String host, String address, 90 boolean shouldSucceed, int count) { 91 test (host, address, shouldSucceed); 92 } 93 94 static void sleep (int seconds) { 95 try { 96 Thread.sleep (seconds * 1000); 97 } catch (InterruptedException e) {} 98 } 99 100 static void test (String host, String address, boolean shouldSucceed) { 101 InetAddress addr = null; 102 try { 103 addr = InetAddress.getByName (host); 104 if (!shouldSucceed) { 105 throw new RuntimeException (host+":"+address+": should fail"); 106 107 } 108 if (!address.equals(addr.getHostAddress())) { 109 throw new RuntimeException(host+":"+address+": compare failed"); 110 } 111 } catch (UnknownHostException e) { 112 if (shouldSucceed) { 113 throw new RuntimeException(host+":"+address+": should succeed"); 114 } 115 } 116 } 117 118 119 private static void addMappingToHostsFile (String host, 120 String addr, 121 String hostsFileName, 122 boolean append) 123 throws Exception { 124 String mapping = addr + " " + host; 125 try (PrintWriter hfPWriter = new PrintWriter(new BufferedWriter( 126 new FileWriter(hostsFileName, append)))) { 127 hfPWriter.println(mapping); 128} 129 } 130} 131