/*

 * Copyright (c) 2010, 2012, 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 6844193

 * @compile -XDignore.symbol.file MaxRetries.java

 * @run main/othervm/timeout=300 MaxRetries

 * @summary support max_retries in krb5.conf

 */

import java.io.*;

import java.net.DatagramSocket;

import java.security.Security;

public class MaxRetries {

    public static void main(String[] args)

            throws Exception {

        System.setProperty("sun.security.krb5.debug", "true");

        new OneKDC(null).writeJAASConf();

        // An idle UDP socket to revent PortUnreachableException

        DatagramSocket ds = new DatagramSocket(33333);

        System.setProperty("java.security.krb5.conf", "alternative-krb5.conf");

        // For tryLast

        Security.setProperty("krb5.kdc.bad.policy", "trylast");

        rewriteMaxRetries(4);

        test1(4000, 6);         // 1 1 1 1 2 2

        test1(4000, 2);         // 2 2

        rewriteMaxRetries(1);

        test1(1000, 3);         // 1 2 2

        test1(1000, 2);         // 2 2

        rewriteMaxRetries(-1);

        test1(5000, 4);         // 1 1 2 2

        test1(5000, 2);         // 2 2

        // For tryLess

        Security.setProperty("krb5.kdc.bad.policy", "tryless");

        rewriteMaxRetries(4);

        test1(4000, 7);         // 1 1 1 1 2 1 2

        test1(4000, 4);         // 1 2 1 2

        rewriteMaxRetries(1);

        test1(1000, 4);         // 1 2 1 2

        test1(1000, 4);         // 1 2 1 2

        rewriteMaxRetries(-1);

        test1(5000, 5);         // 1 1 2 1 2

        test1(5000, 4);         // 1 2 1 2

        rewriteUdpPrefLimit(-1, -1);    // default, no limit

        test2("UDP");

        rewriteUdpPrefLimit(10, -1);    // global rules

        test2("TCP");

        rewriteUdpPrefLimit(10, 10000); // realm rules

        test2("UDP");

        rewriteUdpPrefLimit(10000, 10); // realm rules

        test2("TCP");

        ds.close();

    }

    /**

     * One round of test for max_retries and timeout.

     * @param timeout the expected timeout

     * @param count the expected total try

     */

    private static void test1(int timeout, int count) throws Exception {

        String timeoutTag = "timeout=" + timeout;

        ByteArrayOutputStream bo = new ByteArrayOutputStream();

        PrintStream oldout = System.out;

        System.setOut(new PrintStream(bo));

        Context c = Context.fromJAAS("client");

        System.setOut(oldout);

        String[] lines = new String(bo.toByteArray()).split("\n");

        System.out.println("----------------- TEST (" + timeout + "," +

                count + ") -----------------");

        for (String line: lines) {

            if (line.startsWith(">>> KDCCommunication")) {

                System.out.println(line);

                if (line.indexOf(timeoutTag) < 0) {

                    throw new Exception("Wrong timeout value" + timeoutTag);

                }

                count--;

            }

        }

        if (count != 0) {

            throw new Exception("Retry count is " + count + " less");

        }

    }

    /**

     * One round of test for udp_preference_limit.

     * @param proto the expected protocol used

     */

    private static void test2(String proto) throws Exception {

        ByteArrayOutputStream bo = new ByteArrayOutputStream();

        PrintStream oldout = System.out;

        System.setOut(new PrintStream(bo));

        Context c = Context.fromJAAS("client");

        System.setOut(oldout);

        int count = 2;

        String[] lines = new String(bo.toByteArray()).split("\n");

        System.out.println("----------------- TEST -----------------");

        for (String line: lines) {

            if (line.startsWith(">>> KDCCommunication")) {

                System.out.println(line);

                count--;

                if (line.indexOf(proto) < 0) {

                    throw new Exception("Wrong timeout value");

                }

            }

        }

        if (count != 0) {

            throw new Exception("Retry count is " + count + " less");

        }

    }

    /**

     * Set udp_preference_limit for global and realm

     */

    private static void rewriteUdpPrefLimit(int global, int realm)

            throws Exception {

        BufferedReader fr = new BufferedReader(new FileReader(OneKDC.KRB5_CONF));

        FileWriter fw = new FileWriter("alternative-krb5.conf");

        while (true) {

            String s = fr.readLine();

            if (s == null) {

                break;

            }

            if (s.startsWith("[realms]")) {

                // Reconfig global setting

                if (global != -1) {

                    fw.write("udp_preference_limit = " + global + "\n");

                }

            } else if (s.trim().startsWith("kdc = ")) {

                if (realm != -1) {

                    // Reconfig for realm

                    fw.write("    udp_preference_limit = " + realm + "\n");

                }

            }

            fw.write(s + "\n");

        }

        fr.close();

        fw.close();

        sun.security.krb5.Config.refresh();

    }

    /**

     * Set max_retries and timeout value for realm. The global value is always

     * 2 and 5000.

     * @param value max_retries and timeout/1000 for a realm, -1 means none.

     */

    private static void rewriteMaxRetries(int value) throws Exception {

        BufferedReader fr = new BufferedReader(new FileReader(OneKDC.KRB5_CONF));

        FileWriter fw = new FileWriter("alternative-krb5.conf");

        while (true) {

            String s = fr.readLine();

            if (s == null) {

                break;

            }

            if (s.startsWith("[realms]")) {

                // Reconfig global setting

                fw.write("max_retries = 2\n");

                fw.write("kdc_timeout = 5000\n");

            } else if (s.trim().startsWith("kdc = ")) {

                if (value != -1) {

                    // Reconfig for realm

                    fw.write("    max_retries = " + value + "\n");

                    fw.write("    kdc_timeout = " + (value*1000) + "\n");

                }

                // Add a bad KDC as the first candidate

                fw.write("    kdc = localhost:33333\n");

            }

            fw.write(s + "\n");

        }

        fr.close();

        fw.close();

        sun.security.krb5.Config.refresh();

    }

}