/*

 * 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.

 *

 */

import java.io.*;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import sun.security.krb5.Config;

public class BadKdc {

    // Matches the krb5 debug output:

    // >>> KDCCommunication: kdc=kdc.rabbit.hole UDP:14319, timeout=2000,...

    //                                               ^ kdc#         ^ timeout

    static final Pattern re = Pattern.compile(

            ">>> KDCCommunication: kdc=kdc.rabbit.hole UDP:(\\d)...., " +

            "timeout=(\\d)000,");

    public static void go(int[]... expected)

            throws Exception {

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

        // Make sure KDCs' ports starts with 1 and 2 and 3,

        // useful for checking debug output.

        int p1 = 10000 + new java.util.Random().nextInt(10000);

        int p2 = 20000 + new java.util.Random().nextInt(10000);

        int p3 = 30000 + new java.util.Random().nextInt(10000);

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

        fw.write("[libdefaults]\n" +

                "default_realm = " + OneKDC.REALM + "\n" +

                "kdc_timeout = 2000\n");

        fw.write("[realms]\n" + OneKDC.REALM + " = {\n" +

                "kdc = " + OneKDC.KDCHOST + ":" + p1 + "\n" +

                "kdc = " + OneKDC.KDCHOST + ":" + p2 + "\n" +

                "kdc = " + OneKDC.KDCHOST + ":" + p3 + "\n" +

                "}\n");

        fw.close();

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

        Config.refresh();

        // Turn on k3 only

        KDC k3 = on(p3);

        test(expected[0]);

        test(expected[1]);

        Config.refresh();

        test(expected[2]);

        k3.terminate(); // shutdown k3

        on(p2);         // k2 is on

        test(expected[3]);

        on(p1);         // k1 and k2 is on

        test(expected[4]);

    }

    private static KDC on(int p) throws Exception {

        KDC k = new KDC(OneKDC.REALM, OneKDC.KDCHOST, p, true);

        k.addPrincipal(OneKDC.USER, OneKDC.PASS);

        k.addPrincipalRandKey("krbtgt/" + OneKDC.REALM);

        return k;

    }

    /**

     * One round of test for max_retries and timeout.

     * @param timeout the expected timeout

     * @param expected the expected kdc# timeout kdc# timeout...

     */

    private static void test(int... expected) throws Exception {

        ByteArrayOutputStream bo = new ByteArrayOutputStream();

        PrintStream oldout = System.out;

        System.setOut(new PrintStream(bo));

        Context c = Context.fromUserPass(OneKDC.USER, OneKDC.PASS, false);

        System.setOut(oldout);

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

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

        int count = 0;

        for (String line: lines) {

            Matcher m = re.matcher(line);

            if (m.find()) {

                System.out.println(line);

                if (Integer.parseInt(m.group(1)) != expected[count++] ||

                        Integer.parseInt(m.group(2)) != expected[count++]) {

                    throw new Exception("Fail here");

                }

            }

        }

        if (count != expected.length) {

            throw new Exception("Less rounds");

        }

    }

}