/*

 * Copyright (c) 2010, 2011, 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 6935563 7044870

 * @summary Test that Selector does not select an unconnected DatagramChannel when

 *    ICMP port unreachable received

 */

import java.nio.ByteBuffer;

import java.nio.channels.*;

import java.net.*;

import java.io.IOException;

public class SelectWhenRefused {

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

        DatagramChannel dc1 = DatagramChannel.open().bind(new InetSocketAddress(0));

        int port = dc1.socket().getLocalPort();

        // datagram sent to this address should be refused

        SocketAddress refuser = new InetSocketAddress(InetAddress.getLocalHost(), port);

        DatagramChannel dc = DatagramChannel.open().bind(new InetSocketAddress(0));

        dc1.close();

        Selector sel = Selector.open();

        try {

            dc.configureBlocking(false);

            dc.register(sel, SelectionKey.OP_READ);

            /* Test 1: not connected so ICMP port unreachable should not be received */

            sendDatagram(dc, refuser);

            int n = sel.select(2000);

            if (n > 0) {

                sel.selectedKeys().clear();

                // BindException will be thrown if another service is using

                // our expected refuser port, cannot run just exit.

                DatagramChannel.open().bind(refuser).close();

                throw new RuntimeException("Unexpected wakeup");

            }

            /* Test 2: connected so ICMP port unreachable may be received */

            dc.connect(refuser);

            try {

                sendDatagram(dc, refuser);

                n = sel.select(2000);

                if (n > 0) {

                    sel.selectedKeys().clear();

                    try {

                        n = dc.read(ByteBuffer.allocate(100));

                        throw new RuntimeException("Unexpected datagram received");

                    } catch (PortUnreachableException pue) {

                        // expected

                    }

                }

            } finally {

                dc.disconnect();

            }

            /* Test 3: not connected so ICMP port unreachable should not be received */

            sendDatagram(dc, refuser);

            n = sel.select(2000);

            if (n > 0) {

                throw new RuntimeException("Unexpected wakeup after disconnect");

            }

        } catch(BindException e) {

            // Do nothing, some other test has used this port

        } finally {

            sel.close();

            dc.close();

        }

    }

    static void sendDatagram(DatagramChannel dc, SocketAddress remote)

        throws IOException

    {

        ByteBuffer bb = ByteBuffer.wrap("Greetings!".getBytes());

        dc.send(bb, remote);

    }

}