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/*
* Copyright (c) 2002, 2024, 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.
*/
import javax.naming.CommunicationException;
import javax.naming.Context;
import javax.naming.directory.InitialDirContext;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketTimeoutException;
import java.time.Duration;
import jdk.test.lib.net.URIBuilder;
/*
* @test
* @bug 8200151 8265309
* @summary Tests that we can set the initial UDP timeout interval and the
* number of retries.
* @library ../lib/ /test/lib
* @modules java.base/sun.security.util
* @run main/othervm Timeout
*/
public class Timeout extends DNSTestBase {
// initial timeout = 1/4 sec
private static final int TIMEOUT = 250;
// try 5 times per server
private static final int RETRIES = 5;
// DnsClient retries again with increased timeout if left
// timeout is less than this value, and max retry attempts
// is not reached
private static final int DNS_CLIENT_MIN_TIMEOUT = 0;
private long startTime;
public Timeout() {
setLocalServer(false);
}
public static void main(String[] args) throws Exception {
new Timeout().run(args);
}
/*
* Tests that we can set the initial UDP timeout interval and the
* number of retries.
*/
@Override
public void runTest() throws Exception {
// Create a DatagramSocket and bind it to the loopback address to simulate
// UDP DNS server that doesn't respond
try (DatagramSocket ds = new DatagramSocket(
new InetSocketAddress(InetAddress.getLoopbackAddress(), 0))) {
String allQuietUrl = URIBuilder.newBuilder()
.scheme("dns")
.loopback()
.port(ds.getLocalPort())
.build()
.toString();
env().put(Context.PROVIDER_URL, allQuietUrl);
env().put("com.sun.jndi.dns.timeout.initial", String.valueOf(TIMEOUT));
env().put("com.sun.jndi.dns.timeout.retries", String.valueOf(RETRIES));
setContext(new InitialDirContext(env()));
// Any request should fail after timeouts have expired.
startTime = System.nanoTime();
context().getAttributes("");
throw new RuntimeException(
"Failed: getAttributes succeeded unexpectedly");
}
}
@Override
public boolean handleException(Exception e) {
if (e instanceof CommunicationException) {
Duration elapsedTime = Duration.ofNanos(System.nanoTime() - startTime);
if (!(((CommunicationException) e)
.getRootCause() instanceof SocketTimeoutException)) {
return false;
}
Duration minAllowedTime = Duration.ofMillis(TIMEOUT)
.multipliedBy((1 << RETRIES) - 1)
.minus(Duration.ofMillis(DNS_CLIENT_MIN_TIMEOUT * RETRIES));
Duration maxAllowedTime = Duration.ofMillis(TIMEOUT)
.multipliedBy((1 << RETRIES) - 1)
// max allowed timeout value is set to 2 * expected timeout
.multipliedBy(2);
DNSTestUtils.debug("Elapsed (ms): " + elapsedTime.toMillis());
String expectedRangeMsg = "%s - %s"
.formatted(minAllowedTime.toMillis(), maxAllowedTime.toMillis());
DNSTestUtils.debug("Expected range (ms): " + expectedRangeMsg);
// Check that elapsed time is as long as expected, and
// not more than 2 times greater.
if (elapsedTime.compareTo(minAllowedTime) >= 0 &&
elapsedTime.compareTo(maxAllowedTime) <= 0) {
System.out.println("elapsed time is as long as expected.");
return true;
}
throw new RuntimeException(
"Failed: timeout in " + elapsedTime.toMillis() +
" ms, expected to be in a range (ms): " + expectedRangeMsg);
}
return super.handleException(e);
}
}
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