test/jdk/java/net/Socket/RejectIPv6.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8201510
 * @library /test/lib
 * @summary Make sure IPv6 addresses are rejected when the System option
 *          java.net.preferIPv4Stack is set to true
 * @run main/othervm -Djava.net.preferIPv4Stack=true RejectIPv6
 */

import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import jdk.test.lib.net.IPSupport;

public class RejectIPv6 {

    public static void main(String [] argv) throws Throwable {
        IPSupport.throwSkippedExceptionIfNonOperational();

        ServerSocket serverSocket = new ServerSocket(0);
        serverSocket.setSoTimeout(1000);
        int serverPort = serverSocket.getLocalPort();
        Socket clientSocket = new Socket();

        test("bind", () -> clientSocket.bind(
                new InetSocketAddress("::1", 0)));

        test("connect", () -> clientSocket.connect(
                new InetSocketAddress("::1", serverPort), 1000));
    }

    static void test(String msg, CodeToTest codeToTest) throws Throwable {
        Thread client = new Thread(() ->
            {
                try {
                    codeToTest.run();
                    throw new RuntimeException(msg +
                            " failed to reject IPv6 address");
                } catch (SocketException ok) {
                } catch (Exception exc) {
                    throw new RuntimeException("unexpected", exc);
                }
            });
        client.start();
        client.join();
    }

    interface CodeToTest {
        void run() throws Exception;
    }
}