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 java.net.InetAddress;
25 import java.net.UnknownHostException;
26 
27 import impl.ThrowingLookupsProviderImpl;
28 
29 import static impl.ThrowingLookupsProviderImpl.RUNTIME_EXCEPTION_MESSAGE;
30 
31 import org.testng.Assert;
32 import org.testng.annotations.Test;
33 
34 /*
35  * @test
36  * @summary Test that only UnknownHostException is thrown if resolver
37  * implementation throws RuntimeException during forward or reverse lookup.
38  * @library providers/throwing
39  * @build throwing.lookups.provider/impl.ThrowingLookupsProviderImpl
40  * @run testng/othervm ResolutionWithExceptionTest
41  */
42 
43 public class ResolutionWithExceptionTest {
44 
45     @Test
46     public void getByNameUnknownHostException() {
47         ThrowingLookupsProviderImpl.throwRuntimeException = false;
48         runGetByNameTest();
49     }
50 
51     @Test
52     public void getByNameRuntimeException() {
53         ThrowingLookupsProviderImpl.throwRuntimeException = true;
54         runGetByNameTest();
55     }
56 
57     @Test
58     public void getByAddressUnknownHostException() throws UnknownHostException {
59         ThrowingLookupsProviderImpl.throwRuntimeException = false;
60         runGetByAddressTest();
61     }
62 
63     @Test
64     public void getByAddressRuntimeException() throws UnknownHostException {
65         ThrowingLookupsProviderImpl.throwRuntimeException = true;
66         runGetByAddressTest();
67     }
68 
69     private void runGetByNameTest() {
70         // InetAddress.getByName() is expected to throw UnknownHostException in all cases
71         UnknownHostException uhe = Assert.expectThrows(UnknownHostException.class,
72                 () -> InetAddress.getByName("doesnt.matter.com"));
73         // If provider is expected to throw RuntimeException - check that UnknownHostException
74         // is set as its cause
75         if (ThrowingLookupsProviderImpl.throwRuntimeException) {
76             Throwable cause = uhe.getCause();
77             if (cause instanceof RuntimeException re) {
78                 // Check RuntimeException message
79                 Assert.assertEquals(re.getMessage(), RUNTIME_EXCEPTION_MESSAGE,
80                         "incorrect exception message");
81             } else {
82                 Assert.fail("UnknownHostException cause is not RuntimeException");
83             }
84         }
85     }
86 
87     private void runGetByAddressTest() throws UnknownHostException {
88         // getCanonicalHostName is not expected to throw an exception:
89         // if there is an error during reverse lookup operation the literal IP
90         // address String will be returned.
91         String literalIP = InetAddress.getByAddress(new byte[]{1, 2, 3, 4}).getCanonicalHostName();
92         Assert.assertEquals(literalIP, "1.2.3.4");
93     }
94 }