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 import impl.DelegatingProviderImpl; 25 import org.testng.Assert; 26 import org.testng.annotations.Test; 27 28 import java.net.InetAddress; 29 import java.net.UnknownHostException; 30 31 import static impl.DelegatingProviderImpl.changeReverseLookupAddress; 32 import static impl.DelegatingProviderImpl.lastReverseLookupThrowable; 33 34 /* 35 * @test 36 * @summary checks delegation of illegal reverse lookup request to the built-in 37 * InetAddressResolver. 38 * @library providers/delegating 39 * @build delegating.provider/impl.DelegatingProviderImpl 40 * @run testng/othervm ReverseLookupDelegationTest 41 */ 42 public class ReverseLookupDelegationTest { 43 44 @Test 45 public void delegateHostNameLookupWithWrongByteArray() throws UnknownHostException { 46 // The underlying resolver implementation will ignore the supplied 47 // byte array and will replace it with byte array of incorrect size. 48 changeReverseLookupAddress = true; 49 String canonicalHostName = InetAddress.getByAddress(new byte[]{1, 2, 3, 4}).getCanonicalHostName(); 50 // Output canonical host name and the exception thrown by the built-in resolver 51 System.err.println("Canonical host name:" + canonicalHostName); 52 System.err.println("Exception thrown by the built-in resolver:" + lastReverseLookupThrowable); 53 54 // Check that originally supplied byte array was used to construct canonical host name after 55 // failed reverse lookup. 56 Assert.assertEquals("1.2.3.4", canonicalHostName, "unexpected canonical hostname"); 57 58 // Check that on a provider side the IllegalArgumentException has been thrown by the built-in resolver 59 Assert.assertTrue(lastReverseLookupThrowable instanceof IllegalArgumentException, 60 "wrong exception type is thrown by the built-in resolver"); 61 } 62 }