1 /* 2 * Copyright (c) 2021, 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 package impl; 25 26 import java.net.InetAddress; 27 import java.net.UnknownHostException; 28 import java.net.spi.InetAddressResolver; 29 import java.net.spi.InetAddressResolverProvider; 30 import java.util.stream.Stream; 31 32 public class DelegatingProviderImpl extends InetAddressResolverProvider { 33 34 public static volatile boolean changeReverseLookupAddress; 35 public static volatile Throwable lastReverseLookupThrowable; 36 37 @Override 38 public InetAddressResolver get(Configuration configuration) { 39 System.out.println("The following provider will be used by current test:" + 40 this.getClass().getCanonicalName()); 41 return new InetAddressResolver() { 42 @Override 43 public Stream<InetAddress> lookupAddresses(String host, LookupPolicy lookupPolicy) throws UnknownHostException { 44 return configuration.builtinResolver().lookupAddresses(host, lookupPolicy); 45 } 46 47 @Override 48 public String lookupHostName(byte[] addr) throws UnknownHostException { 49 try { 50 if (!changeReverseLookupAddress) { 51 return configuration.builtinResolver().lookupHostName(addr); 52 } else { 53 // Deliberately supply address bytes array with wrong size 54 return configuration.builtinResolver().lookupHostName(new byte[]{1, 2, 3}); 55 } 56 } catch (Throwable t) { 57 lastReverseLookupThrowable = t; 58 throw t; 59 } 60 } 61 }; 62 } 63 64 @Override 65 public String name() { 66 return "DelegatingProvider"; 67 } 68 }