/*

 * Copyright (c) 2009, 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 java.net.*;

import java.io.*;

import java.nio.channels.*;

import java.util.Enumeration;

/**

 * Sanity check Socket/ServerSocket and each of the stream-oriented channels

 * on each IP address plumbed to the network adapters.

 */

public class Sanity {

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

        Enumeration<NetworkInterface> nifs = NetworkInterface.getNetworkInterfaces();

        while (nifs.hasMoreElements()) {

            NetworkInterface ni = nifs.nextElement();

            Enumeration<InetAddress> addrs = ni.getInetAddresses();

            while (addrs.hasMoreElements()) {

                InetAddress addr = addrs.nextElement();

                test(addr);

            }

        }

    }

    static void test(InetAddress addr) throws Exception {

        System.out.println(addr.getHostAddress());

        // ServerSocketChannel.bind

        ServerSocketChannel ssc = ServerSocketChannel.open();

        try {

            ssc.bind(new InetSocketAddress(addr, 0));

            int port = ((InetSocketAddress)(ssc.getLocalAddress())).getPort();

            // SocketChannel.connect (implicit bind)

            SocketChannel client = SocketChannel.open();

            try {

                client.connect(new InetSocketAddress(addr, port));

                SocketChannel peer = ssc.accept();

                try {

                    testConnection(Channels.newOutputStream(client),

                                   Channels.newInputStream(peer));

                } finally {

                    peer.close();

                }

            } finally {

                client.close();

            }

            // SocketChannel.connect (explicit bind)

            client = SocketChannel.open();

            try {

                client.bind(new InetSocketAddress(addr, 0))

                  .connect(new InetSocketAddress(addr, port));

                ssc.accept().close();

            } finally {

                client.close();

            }

        } finally {

            ssc.close();

        }

        // AsynchronousServerSocketChannel.bind

        AsynchronousServerSocketChannel server =

            AsynchronousServerSocketChannel.open();

        try {

            server.bind(new InetSocketAddress(addr, 0));

            int port = ((InetSocketAddress)(server.getLocalAddress())).getPort();

            // AsynchronousSocketChannel.connect (implicit bind)

            AsynchronousSocketChannel client = AsynchronousSocketChannel.open();

            try {

                client.connect(new InetSocketAddress(addr, port)).get();

                AsynchronousSocketChannel peer = server.accept().get();

                try {

                    testConnection(Channels.newOutputStream(client),

                                   Channels.newInputStream(peer));

                } finally {

                    peer.close();

                }

            } finally {

                client.close();

            }

            // AsynchronousSocketChannel.connect (explicit bind)

            client = AsynchronousSocketChannel.open();

            try {

                client.bind(new InetSocketAddress(addr, 0))

                  .connect(new InetSocketAddress(addr, port)).get();

                server.accept().get().close();

            } finally {

                client.close();

            }

        } finally {

            server.close();

        }

        // ServerSocket.bind

        ServerSocket ss = new ServerSocket();

        try {

            ss.bind(new InetSocketAddress(addr, 0));

            int port = ss.getLocalPort();

            // Socket.connect (implicit bind)

            Socket s = new Socket();

            try {

                s.connect(new InetSocketAddress(addr, port));

                Socket peer = ss.accept();

                try {

                    testConnection(s.getOutputStream(), peer.getInputStream());

                } finally {

                    peer.close();

                }

            } finally {

                s.close();

            }

            // Socket.connect (explicit bind)

            s = new Socket();

            try {

                s.bind(new InetSocketAddress(addr, 0));

                s.connect(new InetSocketAddress(addr, port));

                ss.accept().close();

            } finally {

                s.close();

            }

        } finally {

            ss.close();

        }

    }

    static void testConnection(OutputStream out, InputStream in)

        throws IOException

    {

        byte[] msg = "hello".getBytes();

        out.write(msg);

        byte[] ba = new byte[100];

        int nread = 0;

        while (nread < msg.length) {

            int n = in.read(ba);

            if (n < 0)

                throw new IOException("EOF not expected!");

            nread += n;

        }

    }

}