1 /*

     2  * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 import javax.naming.CommunicationException;

    25 import javax.naming.Context;

    26 import javax.naming.directory.InitialDirContext;

    27 import java.net.SocketTimeoutException;

    28 import java.time.Duration;

    29 import java.time.Instant;

    30 

    31 /*

    32  * @test

    33  * @bug 8200151

    34  * @summary Tests that we can set the initial UDP timeout interval and the

    35  *          number of retries.

    36  * @library ../lib/

    37  * @modules java.base/sun.security.util

    38  * @run main Timeout

    39  */

    40 

    41 public class Timeout extends DNSTestBase {

    42     // Host 10.0.0.0 is a bit bucket, used here to simulate a DNS server that

    43     // doesn't respond. 10.0.0.0 server shouldn't be reachable.

    44     // Ping to this address should not give any reply

    45     private static final String HOST = "10.0.0.0";

    46     // Port 9 is a bit bucket, used here to simulate a DNS server that

    47     // doesn't respond.

    48     private static final int PORT = 9;

    49     // initial timeout = 1/4 sec

    50     private static final int TIMEOUT = 250;

    51     // try 5 times per server

    52     private static final int RETRIES = 5;

    53 

    54     private Instant startTime;

    55 

    56     public Timeout() {

    57         setLocalServer(false);

    58     }

    59 

    60     public static void main(String[] args) throws Exception {

    61         new Timeout().run(args);

    62     }

    63 

    64     /*

    65      * Tests that we can set the initial UDP timeout interval and the

    66      * number of retries.

    67      */

    68     @Override

    69     public void runTest() throws Exception {

    70         String allQuietUrl = "dns://" + HOST + ":" + PORT;

    71         env().put(Context.PROVIDER_URL, allQuietUrl);

    72         env().put("com.sun.jndi.dns.timeout.initial", String.valueOf(TIMEOUT));

    73         env().put("com.sun.jndi.dns.timeout.retries", String.valueOf(RETRIES));

    74         setContext(new InitialDirContext(env()));

    75 

    76         // Any request should fail after timeouts have expired.

    77         startTime = Instant.now();

    78         context().getAttributes("");

    79 

    80         throw new RuntimeException(

    81                 "Failed: getAttributes succeeded unexpectedly");

    82     }

    83 

    84     @Override

    85     public boolean handleException(Exception e) {

    86         if (e instanceof CommunicationException) {

    87             Duration elapsedTime = Duration.between(startTime, Instant.now());

    88             if (!(((CommunicationException) e)

    89                     .getRootCause() instanceof SocketTimeoutException)) {

    90                 return false;

    91             }

    92 

    93             Duration expectedTime = Duration.ofMillis(TIMEOUT)

    94                     .multipliedBy((1 << RETRIES) - 1);

    95             DNSTestUtils.debug("Elapsed (ms):  " + elapsedTime.toMillis());

    96             DNSTestUtils.debug("Expected (ms): " + expectedTime.toMillis());

    97 

    98             // Check that elapsed time is as long as expected, and

    99             // not more than 50% greater.

   100             if (elapsedTime.compareTo(expectedTime) >= 0 &&

   101                     elapsedTime.multipliedBy(2)

   102                             .compareTo(expectedTime.multipliedBy(3)) <= 0) {

   103                 System.out.println("elapsed time is as long as expected.");

   104                 return true;

   105             }

   106             throw new RuntimeException(

   107                     "Failed: timeout in " + elapsedTime.toMillis()

   108                             + " ms, expected" + expectedTime.toMillis() + "ms");

   109         }

   110 

   111         return super.handleException(e);

   112     }

   113 }