1 /* 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 8009875 27 * @summary Provide a default udp_preference_limit for krb5.conf 28 * @modules java.security.jgss/sun.security.krb5:+open 29 * @run main/othervm DefUdpLimit -1 1465 30 * @run main/othervm DefUdpLimit 0 0 31 * @run main/othervm DefUdpLimit 1234 1234 32 * @run main/othervm DefUdpLimit 12345 12345 33 * @run main/othervm DefUdpLimit 123456 32700 34 * 35 */ 36 37 import sun.security.krb5.KdcComm; 38 39 import java.lang.reflect.Field; 40 import java.nio.file.Files; 41 import java.nio.file.Paths; 42 43 public class DefUdpLimit { 44 main(String[] args)45 public static void main(String[] args) throws Exception { 46 int set = Integer.valueOf(args[0]); 47 int expected = Integer.valueOf(args[1]); 48 Field f = KdcComm.class.getDeclaredField("defaultUdpPrefLimit"); 49 f.setAccessible(true); 50 writeConf(set); 51 int actual = (Integer)f.get(null); 52 if (actual != expected) { 53 throw new Exception("Expected: " + expected + ", get " + actual); 54 } 55 } 56 writeConf(int i)57 static void writeConf(int i) throws Exception { 58 String file = "krb5.conf." + i; 59 String content = "[libdefaults]\n"; 60 if (i >= 0) { 61 content += "udp_preference_limit = " + i; 62 } 63 Files.write(Paths.get(file), content.getBytes()); 64 System.setProperty("java.security.krb5.conf", file); 65 } 66 } 67 68