/*

 * Copyright (c) 2000, 2019, 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 4204320

 *

 * @summary DatagramSocket.send should throw exception when connected

 *  to an invalid destination (on platforms that support it).

 */

import java.net.*;

import java.util.*;

import java.io.InterruptedIOException;

public class SendDatagramToBadAddress {

    static boolean debug = false;

    public static boolean OSsupportsFeature () {

        Properties p = System.getProperties ();

        String v;

        if (p.getProperty ("os.name").equals ("Windows 2000"))

            return (true);

        if (p.getProperty ("os.name").equals ("Linux"))

            return (true);

        if (p.getProperty ("os.name").startsWith ("Mac OS"))

            return (true);

        // Check for specific Solaris version from here

        v = p.getProperty ("os.arch");

        if (!v.equalsIgnoreCase ("sparc"))

            return (false);

        v = p.getProperty ("os.name");

        if (!v.equalsIgnoreCase ("Solaris") && !v.equalsIgnoreCase ("SunOS"))

            return (false);

        v = p.getProperty ("os.version");

        if (v.equals ("5.8") || v.equals ("8"))

            return (false);

        return (true);

    }

    static void print (String s) {

        if (debug)

            System.out.println (s);

    }

    class Server {

        DatagramSocket server;

        byte[] buf = new byte [128];

        DatagramPacket pack = new DatagramPacket (buf, buf.length);

        public Server (DatagramSocket s) {

            server = s;

        }

        public void receive (int loop, boolean expectError) throws Exception {

            for (int i=0; i<loop; i++) {

                try {

                    server.receive (pack);

                } catch (Exception e) {

                    if (expectError) {

                        print ("Got expected error: " + e);

                        continue;

                    } else {

                        print ("Got: " + new String (pack.getData()));

                        print ("Expected: " + new String (buf));

                        throw new Exception ("Error reading data: Iter " +i);

                    }

                }

                String s1 = "Hello, server"+i;

                byte[] buf      = s1.getBytes();

                if (!s1.equals (new String (pack.getData(),

                                            pack.getOffset(),pack.getLength()))) {

                    print ("Got: " + new String (pack.getData()));

                    print ("Expected: " + new String (buf));

                    throw new Exception ("Error comparing data: Iter " +i);

                }

            }

        }

    };

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

        if (args.length >=1 && args[0].equals ("-d")) {

            debug = true;

        }

        SendDatagramToBadAddress ud = new SendDatagramToBadAddress ();

        ud.run ();

    }

    public void run() throws Exception {

        if (OSsupportsFeature()) {

            print ("running on OS that supports ICMP port unreachable");

        }

        try (DatagramSocket sock = new DatagramSocket()) {

            test(sock);

        }

    }

    private void test(DatagramSocket sock) throws Exception {

        print("Testing with " + sock.getClass());

        InetAddress addr = InetAddress.getLoopbackAddress();

        DatagramSocket serversock = new DatagramSocket(0);

        DatagramPacket p;

        byte[] buf;

        int port = serversock.getLocalPort ();

        final int loop = 5;

        Server s = new Server (serversock);

        int i;

        print ("Checking send to connected address ...");

        sock.connect(addr, port);

        for (i = 0; i < loop; i++) {

            try {

                buf = ("Hello, server"+i).getBytes();

                if (i % 2 == 1)

                    p = new DatagramPacket(buf, buf.length, addr, port);

                else

                    p = new DatagramPacket(buf, buf.length);

                sock.send(p);

            } catch (Exception ex) {

                print ("Got unexpected exception: " + ex);

                throw new Exception ("Error sending data: ");

            }

        }

        s.receive (loop, false);

        // check disconnect() works

        print ("Checking send to non-connected address ...");

        sock.disconnect ();

        buf = ("Hello, server"+0).getBytes();

        p = new DatagramPacket(buf, buf.length, addr, port);

        sock.send (p);

        s.receive (1, false);

        // check send() to invalid destination followed by a blocking receive

        // returns an error

        print ("Checking send to invalid address ...");

        sock.connect(addr, port);

        serversock.close ();

        try {

            sock.setSoTimeout (4000);

        } catch (Exception e) {

            print ("could not set timeout");

            throw e;

        }

        boolean goterror = false;

        for (i = 0; i < loop; i++) {

            try {

                buf = ("Hello, server"+i).getBytes();

                p = new DatagramPacket(buf, buf.length, addr, port);

                sock.send(p);

                p = new DatagramPacket(buf, buf.length, addr, port);

                sock.receive (p);

            } catch (InterruptedIOException ex) {

                print ("socket timeout");

            } catch (Exception ex) {

                print ("Got expected exception: " + ex);

                goterror = true;

            }

        }

        if (!goterror && OSsupportsFeature ()) {

            print ("Didnt get expected exception: ");

            throw new Exception ("send did not return expected error");

        }

    }

}