/*

 * 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.

 *

 */

/*

 * @test

 * @bug 6521014 6543428

 * @summary IOException thrown when Socket tries to bind to an local IPv6 address on SuSE Linux

 */

import java.net.*;

import java.io.*;

import java.util.*;

/*

 *

 * What this testcase is to test is a (weird) coupling through the

 * cached_scope_id field of java.net.Inet6Address. Native method

 * NET_InetAddressToSockaddr as in Linux platform will try to write

 * and read this field, therefore Inet6Address becomes 'stateful'.

 * So the coupling. Certain executive order, e.g. two methods use

 * the same Inet6Address instance as illustrated in this test case,

 * will show side effect of such coupling.

 *

 * And on Windows, NET_InetAddressToSockaddr() did not assign appropriate

 * sin6_scope_id value to sockaddr_in6 structure if there's no one coming

 * with Inet6Address instance, which caused bind exception. This test use

 * link-local address without %scope suffix, so it is also going to test

 * that.

 *

 */

public class B6521014 {

    static InetAddress sin;

    static Inet6Address getLocalAddr () throws Exception {

        Enumeration e = NetworkInterface.getNetworkInterfaces();

        while (e.hasMoreElements()) {

            NetworkInterface ifc = (NetworkInterface) e.nextElement();

            Enumeration addrs = ifc.getInetAddresses();

            while (addrs.hasMoreElements()) {

                InetAddress a = (InetAddress)addrs.nextElement();

                if (a instanceof Inet6Address) {

                    Inet6Address ia6 = (Inet6Address) a;

                    if (ia6.isLinkLocalAddress()) {

                        // remove %scope suffix

                        return (Inet6Address)InetAddress.getByAddress(ia6.getAddress());

                    }

                }

            }

        }

        return null;

    }

    static void test1() throws Exception {

        ServerSocket ssock;

        Socket sock;

        int port;

        ssock = new ServerSocket(0);

        port = ssock.getLocalPort();

        sock = new Socket();

        try {

            sock.connect(new InetSocketAddress(sin, port), 100);

        } catch (SocketTimeoutException e) {

            // time out exception is okay

            System.out.println("timed out when connecting.");

        }

    }

    static void test2() throws Exception {

        Socket sock;

        ServerSocket ssock;

        int port;

        int localport;

        ssock = new ServerSocket(0);

        ssock.setSoTimeout(100);

        port = ssock.getLocalPort();

        localport = port + 1;

        sock = new Socket();

        sock.bind(new InetSocketAddress(sin, localport));

        try {

            sock.connect(new InetSocketAddress(sin, port), 100);

        } catch (SocketTimeoutException e) {

            // time out exception is okay

            System.out.println("timed out when connecting.");

        }

    }

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

        sin = getLocalAddr();

        if (sin == null) {

            System.out.println("Cannot find a link-local address.");

            return;

        }

        try {

            test1();

            test2();

        } catch (IOException e) {

            throw new RuntimeException("Test failed: cannot create socket.", e);

        }

    }

}