| /* |
| * Copyright (c) 2006, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 6442088 |
| * @summary Change default DNS caching behavior for code not running under |
| * security manager. |
| * @run main/othervm/timeout=200 -Dsun.net.inetaddr.ttl=20 DefaultCaching |
| */ |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| import java.security.Security; |
| import java.io.FileWriter; |
| import java.io.PrintWriter; |
| import java.io.BufferedWriter; |
| |
| public class DefaultCaching { |
| |
| public static void main(String args[]) throws Exception { |
| |
| String hostsFileName = System.getProperty("test.src", ".") + "/DefaultCachingHosts"; |
| System.setProperty("jdk.net.hosts.file", hostsFileName); |
| // initial mapping |
| // name service needs to resolve this. |
| addMappingToHostsFile("theclub", "129.156.220.219", hostsFileName, false); |
| |
| test ("theclub", "129.156.220.219", true); // lk: 1 |
| test ("luster", "1.16.20.2", false); // lk: 2 |
| |
| // name service now needs to know about luster |
| addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true); |
| |
| test ("luster", "1.16.20.2", false); // lk: 2 |
| sleep (10+1); |
| test("luster", "10.5.18.21", true, 3); // lk: 3 |
| sleep (5); |
| |
| // new mapping for theclub and rewrite existing foo and luster mappings |
| addMappingToHostsFile("theclub", "129.156.220.1", hostsFileName, false); |
| addMappingToHostsFile("foo", "10.5.18.22", hostsFileName, true); |
| addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true); |
| |
| test ("theclub", "129.156.220.219", true, 3); |
| test ("luster", "10.5.18.21", true, 3); |
| test ("bar", "10.5.18.22", false, 4); |
| test ("foo", "10.5.18.22", true, 5); |
| |
| // now delay to see if theclub has expired |
| sleep (5); |
| |
| test ("foo", "10.5.18.22", true, 5); |
| test ("theclub", "129.156.220.1", true, 6); |
| |
| sleep (11); |
| // now see if luster has expired |
| test ("luster", "10.5.18.21", true, 7); |
| test ("theclub", "129.156.220.1", true, 7); |
| |
| // now delay to see if 3rd has expired |
| sleep (10+6); |
| |
| test ("theclub", "129.156.220.1", true, 8); |
| test ("luster", "10.5.18.21", true, 8); |
| test ("foo", "10.5.18.22", true, 9); |
| } |
| |
| /* throws RuntimeException if it fails */ |
| |
| static void test (String host, String address, |
| boolean shouldSucceed, int count) { |
| test (host, address, shouldSucceed); |
| } |
| |
| static void sleep (int seconds) { |
| try { |
| Thread.sleep (seconds * 1000); |
| } catch (InterruptedException e) {} |
| } |
| |
| static void test (String host, String address, boolean shouldSucceed) { |
| InetAddress addr = null; |
| try { |
| addr = InetAddress.getByName (host); |
| if (!shouldSucceed) { |
| throw new RuntimeException (host+":"+address+": should fail"); |
| |
| } |
| if (!address.equals(addr.getHostAddress())) { |
| throw new RuntimeException(host+":"+address+": compare failed"); |
| } |
| } catch (UnknownHostException e) { |
| if (shouldSucceed) { |
| throw new RuntimeException(host+":"+address+": should succeed"); |
| } |
| } |
| } |
| |
| |
| private static void addMappingToHostsFile (String host, |
| String addr, |
| String hostsFileName, |
| boolean append) |
| throws Exception { |
| String mapping = addr + " " + host; |
| try (PrintWriter hfPWriter = new PrintWriter(new BufferedWriter( |
| new FileWriter(hostsFileName, append)))) { |
| hfPWriter.println(mapping); |
| } |
| } |
| } |