/*
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 * 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
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 */

/*
 * @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.
 * @modules java.base/sun.security.util
 * @library ../lib/
 * @run main PortUnreachable
 */

import javax.naming.CommunicationException;
import javax.naming.Context;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import java.util.Hashtable;

public class PortUnreachable {

    // Port 25 is the SMTP port, used here to simulate a dead DNS server.
    private static final int PORT = 25;

    public static void main(String[] args) throws Exception {
        Hashtable<Object, Object> env;

        // initialize test
        env = DNSTestUtils.initEnv(false, PortUnreachable.class.getName(), args);

        String deadServerUrl = "dns://localhost:" + PORT;

        env.put(Context.PROVIDER_URL, deadServerUrl);

        DirContext ctx = null;

        try {
            ctx = new InitialDirContext(env);

            // Any request should fail quickly.
            long startTime = System.currentTimeMillis();
            try {
                ctx.getAttributes("");
            } catch (CommunicationException e) {

                long elapsedTime = System.currentTimeMillis() - startTime;

                Throwable cause = e.getRootCause();
                if (cause == null
                        || !(cause instanceof java.net.PortUnreachableException)) {
                    DNSTestUtils
                            .debug("Bug 7164518 can cause this failure on mac");
                    throw e;
                }

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

                // Check that elapsed time is under a second.
                if (elapsedTime < 1000) {
                    return;
                }

                throw new RuntimeException(
                        "Failed: call took " + elapsedTime + " ms");
            }

            // You're running a DNS server on your SMTP port?
            throw new RuntimeException(
                    "Failed: getAttributes succeeded unexpectedly");

        } finally {
            DNSTestUtils.cleanup(ctx);
        }
    }
}