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/*
* Copyright (c) 2002, 2020, 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;
/*
* @test
* @bug 8200151
* @summary Tests that when a DNS server is unreachable and an ICMP Destination
* Unreachable packet is received, we fail quickly and don't wait for
* the full timeout interval. This could be caused, for example, by a
* dead DNS server or a flakey router.
* On AIX, no ICMP Destination Unreachable is received, so skip test.
* @requires os.family != "aix"
* @library ../lib/
* @modules java.base/sun.security.util
* @run main/othervm -Djdk.net.usePlainDatagramSocketImpl=false PortUnreachable
*/
public class PortUnreachable extends DNSTestBase {
// Port 25 is the SMTP port, used here to simulate a dead DNS server.
private static final int PORT = 25;
// Threshold in ms for elapsed time of request failed. Normally, it should
// be very quick, but consider to different platform and test machine
// performance, here we define 3000 ms as threshold which acceptable for
// this test.
private static final int THRESHOLD = 3000;
private long startTime;
public PortUnreachable() {
setLocalServer(false);
}
public static void main(String[] args) throws Exception {
new PortUnreachable().run(args);
}
/*
* Tests that when a DNS server is unreachable and an ICMP Destination
* Unreachable packet is received, we fail quickly and don't wait for
* the full timeout interval.
*/
@Override
public void runTest() throws Exception {
String deadServerUrl = "dns://localhost:" + PORT;
env().put(Context.PROVIDER_URL, deadServerUrl);
setContext(new InitialDirContext(env()));
// Any request should fail quickly.
startTime = System.currentTimeMillis();
context().getAttributes("");
// You're running a DNS server on your SMTP port?
throw new RuntimeException(
"Failed: getAttributes succeeded unexpectedly");
}
@Override
public boolean handleException(Exception e) {
if (e instanceof CommunicationException) {
long elapsedTime = System.currentTimeMillis() - startTime;
Throwable cause = ((CommunicationException) e).getRootCause();
if (!(cause instanceof java.net.PortUnreachableException)) {
DNSTestUtils.debug("Bug 7164518 can cause this failure on mac");
return false;
}
DNSTestUtils.debug("Elapsed (ms): " + elapsedTime);
// Check that elapsed time is less than defined threshold.
if (elapsedTime < THRESHOLD) {
return true;
}
throw new RuntimeException("Failed: call took " + elapsedTime
+ " ms, expected less than " + THRESHOLD + " ms");
}
return super.handleException(e);
}
}
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