7003398: NetworkInterface equals() and hashCode() behaviors depend on permissions granted

Reviewed-by: chegar, alanb

src/share/classes/java/net/NetworkInterface.java

@@ -493,55 +493,44 @@ public final class NetworkInterface {
      * @see     java.net.InetAddress#getAddress()
      */
     public boolean equals(Object obj) {
-        if ((obj == null) || !(obj instanceof NetworkInterface)) {
+        if (!(obj instanceof NetworkInterface)) {
             return false;
         }
-        NetworkInterface netIF = (NetworkInterface)obj;
-        if (name != null ) {
-            if (netIF.getName() != null) {
-                if (!name.equals(netIF.getName())) {
-                    return false;
-                }
-            } else {
+        NetworkInterface that = (NetworkInterface)obj;
+        if (this.name != null ) {
+            if (!this.name.equals(that.name)) {
                 return false;
             }
         } else {
-            if (netIF.getName() != null) {
+            if (that.name != null) {
                 return false;
             }
         }
-        Enumeration newAddrs = netIF.getInetAddresses();
-        int i = 0;
-        for (i = 0; newAddrs.hasMoreElements();newAddrs.nextElement(), i++);
-        if (addrs == null) {
-            if (i != 0) {
-                return false;
-            }
-        } else {
-            /*
-             * Compare number of addresses (in the checked subset)
-             */
-            int count = 0;
-            Enumeration e = getInetAddresses();
-            for (; e.hasMoreElements(); count++) {
-                e.nextElement();
-            }
-            if (i != count) {
-                return false;
-            }
+
+        if (this.addrs == null) {
+            return that.addrs == null;
+        } else if (that.addrs == null) {
+            return false;
+        }
+
+        /* Both addrs not null. Compare number of addresses */
+
+        if (this.addrs.length != that.addrs.length) {
+            return false;
         }
-        newAddrs = netIF.getInetAddresses();
-        for (; newAddrs.hasMoreElements();) {
-            boolean equal = false;
-            Enumeration thisAddrs = getInetAddresses();
-            InetAddress newAddr = (InetAddress)newAddrs.nextElement();
-            for (; thisAddrs.hasMoreElements();) {
-                InetAddress thisAddr = (InetAddress)thisAddrs.nextElement();
-                if (thisAddr.equals(newAddr)) {
-                    equal = true;
+
+        InetAddress[] thatAddrs = that.addrs;
+        int count = thatAddrs.length;
+
+        for (int i=0; i<count; i++) {
+            boolean found = false;
+            for (int j=0; j<count; j++) {
+                if (addrs[i].equals(thatAddrs[j])) {
+                    found = true;
+                    break;
                 }
             }
-            if (!equal) {
+            if (!found) {
                 return false;
             }
         }
@@ -549,12 +538,7 @@ public final class NetworkInterface {
     }
 
     public int hashCode() {
-        int count = name == null? 0: name.hashCode();
-        Enumeration<InetAddress> addrs = getInetAddresses();
-        while (addrs.hasMoreElements()) {
-            count += addrs.nextElement().hashCode();
-        }
-        return count;
+        return name == null? 0: name.hashCode();
     }
 
     public String toString() {

test/java/net/NetworkInterface/Equals.java

+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+ * @bug 7003398
+ * @run main/othervm Equals
+ */
+import java.net.NetworkInterface;
+import java.net.InetAddress;
+import java.util.Enumeration;
+import java.util.HashMap;
+
+public class Equals {
+
+    public static void main(String args[]) throws Exception {
+
+        Enumeration nifs1 = NetworkInterface.getNetworkInterfaces();
+        HashMap<String,Integer> hashes = new HashMap<>();
+        HashMap<String,NetworkInterface> nicMap = new HashMap<>();
+
+        while (nifs1.hasMoreElements()) {
+            NetworkInterface ni = (NetworkInterface)nifs1.nextElement();
+            hashes.put(ni.getName(),ni.hashCode());
+            nicMap.put(ni.getName(),ni);
+        }
+
+        System.setSecurityManager(new SecurityManager());
+
+        Enumeration nifs2 = NetworkInterface.getNetworkInterfaces();
+        while (nifs2.hasMoreElements()) {
+            NetworkInterface ni = (NetworkInterface)nifs2.nextElement();
+            NetworkInterface niOrig = nicMap.get(ni.getName());
+
+            int h = hashes.get(ni.getName());
+            if (h != ni.hashCode()) {
+                throw new RuntimeException ("Hashcodes different for " +
+                        ni.getName());
+            }
+            if (!ni.equals(niOrig)) {
+                throw new RuntimeException ("equality different for " +
+                        ni.getName());
+            }
+        }
+    }
+}