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/*
* Copyright (c) 2002, 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 4292867
* @summary Check that InetAddress doesn't continue to throw UHE
* after the name service has recovered and the negative ttl
* on the initial lookup has expired.
* @run main/othervm/timeout=200 CacheTest
*/
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.Security;
import java.io.PrintWriter;
import java.io.FileWriter;
import java.io.BufferedWriter;
public class CacheTest {
public static void main(String args[]) throws Exception {
/*
* First check the ttl on negative lookups is in the <15 second
* range. If the ttl is <=0 it means we cache forever or always
* consult the name service. For ttl > 15 the test would take
* too long so we skip it (need to coordinate jtreg timeout
* with negative ttl)
*/
String ttlProp = "networkaddress.cache.negative.ttl";
int ttl = 0;
String policy = Security.getProperty(ttlProp);
if (policy != null) {
ttl = Integer.parseInt(policy);
}
if (ttl <= 0 || ttl > 15) {
System.err.println("Security property " + ttlProp + " needs to " +
" in 1-15 second range to execute this test");
return;
}
String hostsFileName = System.getProperty("test.src", ".") + "/CacheTestHosts";
System.setProperty("jdk.net.hosts.file", hostsFileName);
/*
* The following outlines how the test works :-
*
* 1. Do a lookup via InetAddress.getByName that it guaranteed
* to succeed. This forces at least one entry into the cache
* that will not expire.
*
* 2. Do a lookup via InetAddress.getByName that is guarnateed
* to fail. This results in a negative lookup cached for
* for a short period to time.
*
* 3. Wait for the cache entry to expire.
*
* 4. Do a lookup (which should consult the name service) and
* the lookup should succeed.
*/
// name service needs to resolve this.
addMappingToHostsFile("theclub", "129.156.220.219", hostsFileName, false);
// this lookup will succeed
InetAddress.getByName("theclub");
// lookup "luster" - this should throw UHE as name service
// doesn't know anything about this host.
try {
InetAddress.getByName("luster");
throw new RuntimeException("Test internal error " +
" - luster is being resolved by name service");
} catch (UnknownHostException x) {
}
// name service now needs to know about luster
addMappingToHostsFile("luster", "10.5.18.21", hostsFileName, true);
// wait for the cache entry to expire and lookup should
// succeed.
Thread.currentThread().sleep(ttl*1000 + 1000);
InetAddress.getByName("luster");
}
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);
}
}
}
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