/*
 * Copyright (c) 2018, 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 javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLHandshakeException;
import javax.net.ssl.SSLParameters;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.ByteArrayInputStream;
import java.nio.ByteBuffer;
import java.security.KeyStore;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Base64;

/*
 * @test
 * @bug 8211339
 * @summary Verify hostname returns an exception instead of null pointer when
 * creating a new engine
 * @run main NullHostnameCheck
 */


public final class NullHostnameCheck {

    public static void main(String[] args) throws Exception {
        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
        keyStore.load(
                new ByteArrayInputStream(Base64.getDecoder().
                        decode(keystoreB64)),
                "123456".toCharArray());
        KeyManagerFactory kmf = KeyManagerFactory.getInstance(
                KeyManagerFactory.getDefaultAlgorithm());
        kmf.init(keyStore, "123456".toCharArray());
        SSLContext serverCtx = SSLContext.getInstance("TLSv1.2");
        serverCtx.init(kmf.getKeyManagers(), null, null);
        SSLEngine serverEngine = serverCtx.createSSLEngine("localhost", -1);
        serverEngine.setUseClientMode(false);

        SSLContext clientCtx = SSLContext.getInstance("TLSv1.2");
        clientCtx.init(null, new TrustManager[] {
                new X509TrustManager() {
                    @Override
                    public void checkClientTrusted(
                            X509Certificate[] x509Certificates, String s) {
                    }

                    @Override
                    public void checkServerTrusted(
                            X509Certificate[] x509Certificates, String s) {
                    }

                    @Override
                    public X509Certificate[] getAcceptedIssuers() {
                        return new X509Certificate[0];
                    }
                }
        }, null);

        SSLEngine clientEngine = clientCtx.createSSLEngine();
        clientEngine.setUseClientMode(true);

        SSLParameters sslParameters = clientEngine.getSSLParameters();
        sslParameters.setEndpointIdentificationAlgorithm("HTTPS");
        clientEngine.setSSLParameters(sslParameters);
        try {
            handshake(clientEngine, serverEngine);
            throw new Exception("Value was not null.  Unexpected.");
        } catch (SSLHandshakeException e) {
            if (e.getCause() instanceof CertificateException) {
                System.out.println("Correct Exception class thrown:\n\t" +
                        e.getMessage());
                return;
            }
            throw e;
        }
    }

    private static void handshake(SSLEngine clientEngine,
            SSLEngine serverEngine) throws SSLException{
        ByteBuffer cTOs = ByteBuffer.allocate(
                clientEngine.getSession().getPacketBufferSize());
        ByteBuffer sTOc = ByteBuffer.allocate(
                serverEngine.getSession().getPacketBufferSize());

        ByteBuffer serverAppReadBuffer = ByteBuffer.allocate(
                serverEngine.getSession().getApplicationBufferSize());
        ByteBuffer clientAppReadBuffer = ByteBuffer.allocate(
                clientEngine.getSession().getApplicationBufferSize());

        clientEngine.beginHandshake();
        serverEngine.beginHandshake();

        ByteBuffer empty = ByteBuffer.allocate(0);

        SSLEngineResult clientResult;
        SSLEngineResult serverResult;

        boolean clientHandshakeFinished = false;
        boolean serverHandshakeFinished = false;

        do {
            if (!clientHandshakeFinished) {
                clientResult = clientEngine.wrap(empty, cTOs);
                runDelegatedTasks(clientResult, clientEngine);

                if (isHandshakeFinished(clientResult)) {
                    clientHandshakeFinished = true;
                }
            }

            if (!serverHandshakeFinished) {
                serverResult = serverEngine.wrap(empty, sTOc);
                runDelegatedTasks(serverResult, serverEngine);

                if (isHandshakeFinished(serverResult)) {
                    serverHandshakeFinished = true;
                }
            }

            cTOs.flip();
            sTOc.flip();

            if (!clientHandshakeFinished) {
                clientResult = clientEngine.unwrap(sTOc, clientAppReadBuffer);

                runDelegatedTasks(clientResult, clientEngine);

                if (isHandshakeFinished(clientResult)) {
                    clientHandshakeFinished = true;
                }
            }

            if (!serverHandshakeFinished) {
                serverResult = serverEngine.unwrap(cTOs, serverAppReadBuffer);
                runDelegatedTasks(serverResult, serverEngine);

                if (isHandshakeFinished(serverResult)) {
                    serverHandshakeFinished = true;
                }
            }

            sTOc.compact();
            cTOs.compact();
        } while (!clientHandshakeFinished || !serverHandshakeFinished);
    }

    private static boolean isHandshakeFinished(SSLEngineResult result) {
        return result.getHandshakeStatus() ==
                SSLEngineResult.HandshakeStatus.FINISHED;
    }

    private static void runDelegatedTasks(SSLEngineResult result,
            SSLEngine engine) {
        if (result.getHandshakeStatus() ==
                SSLEngineResult.HandshakeStatus.NEED_TASK) {
            for (;;) {
                Runnable task = engine.getDelegatedTask();
                if (task == null) {
                    break;
                }
                task.run();
            }
        }
    }

// Base64 of PKCS12 Keystore
static final String keystoreB64 =
        "MIIQ6wIBAzCCEKQGCSqGSIb3DQEHAaCCEJUEghCRMIIQjTCCBgEGCSqGSIb3DQEHAa" +
        "CCBfIEggXuMIIF6jCCAuwGCyqGSIb3DQEMCgECoIICmzCCApcwKQYKKoZIhvcNAQwB" +
        "AzAbBBS7qnTOxJYV5At3migAiNAdPvKd7AIDAMNQBIICaMo0roH1TuZE1ARZtwCOXy" +
        "F2sk4DmI6m1/CRdh6NeQzszJZH2701cEm0CES971IwobCNFo0+Er9tk1c+iXmMPJgM" +
        "s1l/+7OpQCc/GRl2Nc7lQSj1Yvrq1CIQxC51hSrwNs0N9aCTavjKfJ7jk3k1+MNItU" +
        "dMdwuIFK663NEH8Wm0D4njvIA9p3ehOLJWDi0ziFTcySyCbbWAL6HmJhzRlpakPpbp" +
        "Ox68wfI2YgDpQwTq580TMEWz+9P1U07VmtfYlu9xjXQT/Ks1xzNrhbOyv+HLoE54qL" +
        "RyhL36/fwCzlpCXCYokPUG2uziu8JiQyITYRpVhVcgR5m/rSMhVsj8HwUmIdlK2Irm" +
        "kOqG2m6YPKRiq7eeCPskcf2Hh0H3pb6lxagSVQMb+qndIUhCvZoXL/oS2+1ngtMlXh" +
        "ezjIEa5s2K+Kk8eV48Ydms5bW8Plqy20+0fgEClABF6QL4We4NaFJdl6DB0+KsxgUd" +
        "ZHo4U7f3R6o971mAd/OACs4jzpA0/C3AKCbhBEh/nxnSPoxM0Ty3bLaK8LQnv+B2uo" +
        "6TeypsxmGg4/kd6fymzrhWUJAFz7DjkO/32pDUXnUDa6CB+dZdUldPoOpviGl9ITfG" +
        "apdnq8+B4y7lg/87OZbr99vyVBWtbATaNof3Y5PuNY5TTQ5y1u4gU+zO9qhRnjxSqb" +
        "bXJYhKeOIJmXCgGerV1dFqcWfj163OtjTwwJ5VCrtgolTU+3eodARD86jkp1VRCtQ2" +
        "M54zOND9mx9RM2ucOy41mgF2MyKIseN6+3665DtgDbN5H/pmmjR4/GSuuy4eJoGHvY" +
        "OPy49P7o8xPjAZBgkqhkiG9w0BCRQxDB4KAG0AeQBrAGUAeTAhBgkqhkiG9w0BCRUx" +
        "FAQSVGltZSAxNTQxMTg5MzQ5NTAxMIIC9gYLKoZIhvcNAQwKAQKgggKbMIIClzApBg" +
        "oqhkiG9w0BDAEDMBsEFO1oLv/9BmQKRKpeUB/Q5FPzMZaPAgMAw1AEggJoxez71rvm" +
        "pCMbF0MH3shCpy2LsHNnkyjQVTKBIqdHFmn1390gqRkUUlvaaLgpjNNFSVY/LMg+gK" +
        "JEJW6kClerkFg1/fvMQDBr5ApGbACIWi7fN/qYjED0cY5eypnSKePUzR2uO254Qko4" +
        "xc+Enx3+V0/O0eqwlzGq3Pmgq9vfyqPefG562tFQEmHyUMUTLg1m4rtUgG5bvtRIMl" +
        "Vd6tgFA3JRb08USaJY3D+FQFb+zm/iIJ1KrHBgtBuJFLfaXqYo/fjjgIv0WiOIQmd1" +
        "ygrfRp7AhCvqZu7IzKT3TWggfGHABfjgkRcVmCGsFCf1cXAJVzS1v4N2biY9tB9Q5Y" +
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}