1 /*
2  * Copyright (c) 2008, 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
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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
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22  */
23 
24 /* @test
25  * @bug 6628576
26  * @modules java.base/java.net:open
27  * @summary InterfaceAddress.equals() NPE when broadcast field == null
28  */
29 
30 import java.net.InterfaceAddress;
31 import java.net.InetAddress;
32 import java.net.UnknownHostException;
33 import java.lang.reflect.Constructor;
34 import java.lang.reflect.Field;
35 import java.lang.reflect.InvocationTargetException;
36 
37 public class Equals
38 {
main(String[] args)39     public static void main(String[] args) {
40         InterfaceAddress ia1;
41         InterfaceAddress ia2;
42         InetAddress loopbackAddr = InetAddress.getLoopbackAddress();
43         InetAddress broadcast1 = null;
44         InetAddress broadcast2 = null;
45 
46         try {
47             broadcast1 = InetAddress.getByName("255.255.255.0");
48             broadcast2 = InetAddress.getByName("255.255.0.0");
49         } catch (UnknownHostException e) {
50             e.printStackTrace();
51         }
52 
53         ia1 = createInterfaceAddress(loopbackAddr, (InetAddress) null, (short)45);
54         ia2 = createInterfaceAddress(loopbackAddr, (InetAddress) null, (short)45);
55 
56         compare(ia1, ia2, true);
57 
58         ia2 = createInterfaceAddress(loopbackAddr, broadcast1, (short)45);
59         compare(ia1, ia2, false);
60 
61         ia2 = createInterfaceAddress((InetAddress)null, broadcast1, (short)45);
62         compare(ia1, ia2, false);
63 
64         ia1 = createInterfaceAddress(loopbackAddr, broadcast2, (short)45);
65         ia2 = createInterfaceAddress(loopbackAddr, broadcast2, (short)45);
66         compare(ia1, ia2, true);
67 
68         ia1.equals(null);
69     }
70 
compare(InterfaceAddress ia1, InterfaceAddress ia2, boolean equal)71     static void compare(InterfaceAddress ia1, InterfaceAddress ia2, boolean equal) {
72         if (ia1.equals(ia2) != equal)
73             throw new RuntimeException("Failed: " + ia1 + " not equals to " + ia2);
74 
75         if (ia2.equals(ia1) != equal)
76             throw new RuntimeException("Failed: " + ia2 + " not equals to " + ia1);
77     }
78 
79     /**
80      * Returns an InterfaceAddress instance with its fields set the the values
81      * specificed.
82      */
createInterfaceAddress( InetAddress address, InetAddress broadcast, short prefixlength)83     static InterfaceAddress createInterfaceAddress(
84                 InetAddress address, InetAddress broadcast, short prefixlength) {
85         try {
86             Class<InterfaceAddress> IAClass = InterfaceAddress.class;
87             InterfaceAddress ia;
88             Constructor<InterfaceAddress> ctr = IAClass.getDeclaredConstructor();
89             ctr.setAccessible(true);
90 
91             Field addressField = IAClass.getDeclaredField("address");
92             addressField.setAccessible(true);
93 
94             Field broadcastField = IAClass.getDeclaredField("broadcast");
95             broadcastField.setAccessible(true);
96 
97             Field maskLengthField = IAClass.getDeclaredField("maskLength");
98             maskLengthField.setAccessible(true);
99 
100             ia = ctr.newInstance();
101             addressField.set(ia, address);
102             broadcastField.set(ia, broadcast);
103             maskLengthField.setShort(ia, prefixlength);
104 
105             return ia;
106         } catch (NoSuchFieldException nsfe) {
107             nsfe.printStackTrace();
108         } catch (NoSuchMethodException e) {
109             e.printStackTrace();
110         } catch (InstantiationException ie) {
111             ie.printStackTrace();
112         } catch (IllegalAccessException iae) {
113             iae.printStackTrace();
114         } catch (InvocationTargetException ite) {
115             ite.printStackTrace();
116         }
117 
118         return null;
119     }
120 }
121