1 /* 2 * Copyright (c) 2002, 2018, 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 8200151 27 * @summary Tests that when a DNS server is unreachable and an ICMP Destination 28 * Unreachable packet is received, we fail quickly and don't wait for 29 * the full timeout interval. This could be caused, for example, by a 30 * dead DNS server or a flakey router. 31 * @modules java.base/sun.security.util 32 * @library ../lib/ 33 * @run main PortUnreachable 34 */ 35 36 import javax.naming.CommunicationException; 37 import javax.naming.Context; 38 import javax.naming.directory.DirContext; 39 import javax.naming.directory.InitialDirContext; 40 import java.util.Hashtable; 41 42 public class PortUnreachable { 43 44 // Port 25 is the SMTP port, used here to simulate a dead DNS server. 45 private static final int PORT = 25; 46 47 public static void main(String[] args) throws Exception { 48 Hashtable<Object, Object> env; 49 50 // initialize test 51 env = DNSTestUtils.initEnv(false, PortUnreachable.class.getName(), args); 52 53 String deadServerUrl = "dns://localhost:" + PORT; 54 55 env.put(Context.PROVIDER_URL, deadServerUrl); 56 57 DirContext ctx = null; 58 59 try { 60 ctx = new InitialDirContext(env); 61 62 // Any request should fail quickly. 63 long startTime = System.currentTimeMillis(); 64 try { 65 ctx.getAttributes(""); 66 } catch (CommunicationException e) { 67 68 long elapsedTime = System.currentTimeMillis() - startTime; 69 70 Throwable cause = e.getRootCause(); 71 if (cause == null 72 || !(cause instanceof java.net.PortUnreachableException)) { 73 DNSTestUtils 74 .debug("Bug 7164518 can cause this failure on mac"); 75 throw e; 76 } 77 78 DNSTestUtils.debug("Elapsed (ms): " + elapsedTime); 79 80 // Check that elapsed time is under a second. 81 if (elapsedTime < 1000) { 82 return; 83 } 84 85 throw new RuntimeException( 86 "Failed: call took " + elapsedTime + " ms"); 87 } 88 89 // You're running a DNS server on your SMTP port? 90 throw new RuntimeException( 91 "Failed: getAttributes succeeded unexpectedly"); 92 93 } finally { 94 DNSTestUtils.cleanup(ctx); 95 } 96 } 97 }