148 lines
5.4 KiB
Java
148 lines
5.4 KiB
Java
/*
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* Copyright (c) 2006, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 6442088
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* @summary Change default DNS caching behavior for code not running under
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* security manager.
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* @run main/othervm/timeout=200 -Djdk.net.hosts.file=DefaultCachingHosts
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* -Dsun.net.inetaddr.ttl=20 DefaultCaching
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*/
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.io.FileWriter;
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import java.io.PrintWriter;
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import java.io.BufferedWriter;
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public class DefaultCaching {
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public static void main(String args[]) throws Exception {
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String hostsFileName = System.getProperty("jdk.net.hosts.file");
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addMappingToHostsFile("theclub", "129.156.220.219", hostsFileName, false);
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test("theclub", "129.156.220.219", true); // lk: 1
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test("luster", "1.16.20.2", false); // lk: 2
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// name service now needs to know about luster
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addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true);
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test("luster", "1.16.20.2", false); // lk: 2
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sleep(10+1);
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test("luster", "10.5.18.21", true, 3); // lk: 3
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sleep(5);
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// new mapping for theclub and rewrite existing foo and luster mappings
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addMappingToHostsFile("theclub", "129.156.220.1", hostsFileName, false);
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addMappingToHostsFile("foo", "10.5.18.22", hostsFileName, true);
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addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true);
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test("theclub", "129.156.220.219", true, 3);
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test("luster", "10.5.18.21", true, 3);
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test("bar", "10.5.18.22", false, 4);
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test("foo", "10.5.18.22", true, 5);
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// now delay to see if theclub has expired
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sleep(5);
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test("foo", "10.5.18.22", true, 5);
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test("theclub", "129.156.220.1", true, 6);
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sleep(11);
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// now see if luster has expired
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test("luster", "10.5.18.21", true, 7);
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test("theclub", "129.156.220.1", true, 7);
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// now delay to see if 3rd has expired
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sleep(10+6);
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test("theclub", "129.156.220.1", true, 8);
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test("luster", "10.5.18.21", true, 8);
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test("foo", "10.5.18.22", true, 9);
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}
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/* throws RuntimeException if it fails */
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static void test(String host, String address,
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boolean shouldSucceed, int count) {
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test(host, address, shouldSucceed);
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}
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static void sleep(int seconds) {
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try {
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sleepms(seconds * 1000);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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static long sleepms(long millis) throws InterruptedException {
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long start = System.nanoTime();
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long ms = millis;
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while (ms > 0) {
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assert ms < Long.MAX_VALUE/1000_000L;
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Thread.sleep(ms);
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long elapsedms = (System.nanoTime() - start)/1000_000L;
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ms = millis - elapsedms;
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}
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return millis - ms;
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}
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static void test(String host, String address, boolean shouldSucceed) {
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InetAddress addr = null;
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try {
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addr = InetAddress.getByName(host);
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if (!shouldSucceed) {
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throw new RuntimeException(host+":"+address+": should fail (got "
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+ addr + ")");
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}
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if (!address.equals(addr.getHostAddress())) {
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throw new RuntimeException(host+"/"+address+": compare failed (found "
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+ addr + ")");
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}
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System.out.println("test: " + host + "/" + address
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+ " succeeded - got " + addr);
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} catch (UnknownHostException e) {
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if (shouldSucceed) {
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throw new RuntimeException(host+":"+address+": should succeed");
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} else {
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System.out.println("test: " + host + "/" + address
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+ " succeeded - got expected " + e);
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}
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}
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}
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private static void addMappingToHostsFile(String host,
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String addr,
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String hostsFileName,
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boolean append)
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throws Exception {
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String mapping = addr + " " + host;
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try (PrintWriter hfPWriter = new PrintWriter(new BufferedWriter(
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new FileWriter(hostsFileName, append)))) {
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hfPWriter.println(mapping);
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}
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}
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}
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