6717876: Make java.net.NetworkInterface.getIndex() public

Make getIndex() and getByIndex() public. Required a name change in native code

Reviewed-by: alanb, chegar, michaelm

jdk/make/java/net/mapfile-vers

@@ -57,7 +57,7 @@ SUNWprivate_1.1 {
 		Java_java_net_Inet6AddressImpl_isReachable0;
 		Java_java_net_NetworkInterface_init;
 		Java_java_net_NetworkInterface_getByName0;
-		Java_java_net_NetworkInterface_getByIndex;
+		Java_java_net_NetworkInterface_getByIndex0;
 		Java_java_net_NetworkInterface_getByInetAddress0;
 		Java_java_net_NetworkInterface_getAll;
 		Java_java_net_NetworkInterface_isUp0;

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

@@ -203,11 +203,17 @@ public final class NetworkInterface {
     }
 
     /**
-     * Get the index of this network interface.
+     * Returns the index of this network interface. The index is an integer greater
+     * or equal to zero, or {@code -1} for unknown. This is a system specific value
+     * and interfaces with the same name can have different indexes on different
+     * machines.
      *
-     * @return the index of this network interface
+     * @return the index of this network interface or {@code -1} if the index is
+     *         unknown
+     * @see #getByIndex(int)
+     * @since 1.7
      */
-    int getIndex() {
+    public int getIndex() {
         return index;
     }
 
@@ -249,11 +255,18 @@ public final class NetworkInterface {
      * Get a network interface given its index.
      *
      * @param index an integer, the index of the interface
-     * @return the NetworkInterface obtained from its index
+     * @return the NetworkInterface obtained from its index, or {@code null} if
-     * @exception  SocketException  if an I/O error occurs.
+     *         there is no interface with such an index on the system
+     * @throws  SocketException  if an I/O error occurs.
+     * @throws  IllegalArgumentException if index has a negative value
+     * @see #getIndex()
+     * @since 1.7
      */
-    native static NetworkInterface getByIndex(int index)
+    public static NetworkInterface getByIndex(int index) throws SocketException {
-        throws SocketException;
+        if (index < 0)
+            throw new IllegalArgumentException("Interface index can't be negative");
+        return getByIndex0(index);
+    }
 
     /**
      * Convenience method to search for a network interface that
@@ -325,6 +338,9 @@ public final class NetworkInterface {
     private native static NetworkInterface getByName0(String name)
         throws SocketException;
 
+    private native static NetworkInterface getByIndex0(int index)
+        throws SocketException;
+
     private native static NetworkInterface getByInetAddress0(InetAddress addr)
         throws SocketException;
 

jdk/src/solaris/native/java/net/NetworkInterface.c

@@ -206,10 +206,10 @@ JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByName0
 
 /*
  * Class:     java_net_NetworkInterface
- * Method:    getByIndex
+ * Method:    getByIndex0
  * Signature: (Ljava/lang/String;)Ljava/net/NetworkInterface;
  */
-JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex
+JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex0
     (JNIEnv *env, jclass cls, jint index) {
 
     netif *ifs, *curr;

jdk/src/solaris/native/java/net/PlainDatagramSocketImpl.c

@@ -1741,7 +1741,7 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, jint opt) {
          * (for IF).
          */
         if (index > 0) {
-            ni = Java_java_net_NetworkInterface_getByIndex(env, ni_class,
+            ni = Java_java_net_NetworkInterface_getByIndex0(env, ni_class,
                                                                    index);
             if (ni == NULL) {
                 char errmsg[255];

jdk/src/windows/native/java/net/NetworkInterface.c

@@ -762,17 +762,17 @@ JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByName0
 
 /*
  * Class:     NetworkInterface
- * Method:    getByIndex
+ * Method:    getByIndex0
  * Signature: (I)LNetworkInterface;
  */
-JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex
+JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex0
   (JNIEnv *env, jclass cls, jint index)
 {
     netif *ifList, *curr;
     jobject netifObj = NULL;
 
     if (os_supports_ipv6 && ipv6_available()) {
-        return Java_java_net_NetworkInterface_getByIndex_XP (env, cls, index);
+        return Java_java_net_NetworkInterface_getByIndex0_XP (env, cls, index);
     }
 
     /* get the list of interfaces */

jdk/src/windows/native/java/net/NetworkInterface_winXP.c

@@ -576,10 +576,10 @@ JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByName0_XP
 
 /*
  * Class:     NetworkInterface
- * Method:    getByIndex
+ * Method:    getByIndex0_XP
  * Signature: (I)LNetworkInterface;
  */
-JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex_XP
+JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex0_XP
   (JNIEnv *env, jclass cls, jint index)
 {
     netif *ifList, *curr;

jdk/src/windows/native/java/net/TwoStacksPlainDatagramSocketImpl.c

@@ -2090,7 +2090,7 @@ jobject getMulticastInterface(JNIEnv *env, jobject this, int fd, int fd1, jint o
          * (for IF).
          */
         if (index > 0) {
-            ni = Java_java_net_NetworkInterface_getByIndex(env, ni_class,
+            ni = Java_java_net_NetworkInterface_getByIndex0(env, ni_class,
                                                                    index);
             if (ni == NULL) {
                 char errmsg[255];

jdk/src/windows/native/java/net/net_util_md.h

@@ -329,7 +329,7 @@ extern jint NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout);
 JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByName0_XP
     (JNIEnv *env, jclass cls, jstring name);
 
-JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex_XP
+JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByIndex0_XP
   (JNIEnv *env, jclass cls, jint index);
 
 JNIEXPORT jobject JNICALL Java_java_net_NetworkInterface_getByInetAddress0_XP

jdk/test/java/net/NetworkInterface/IndexTest.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ * @bug 6717876
+ * @summary Make java.net.NetworkInterface.getIndex() public
+ */
+
+import java.net.*;
+import java.util.Enumeration;
+
+public class IndexTest {
+    public static void main(String[] args) throws Exception {
+        Enumeration<NetworkInterface> netifs = NetworkInterface.getNetworkInterfaces();
+        NetworkInterface nif = null;
+        while (netifs.hasMoreElements()) {
+            nif = netifs.nextElement();
+            int index = nif.getIndex();
+            if (index >= 0) {
+                NetworkInterface nif2 = NetworkInterface.getByIndex(index);
+                if (! nif.equals(nif2)) {
+                    throw new RuntimeException("both interfaces should be equal");
+                }
+            }
+        }
+        try {
+            nif = NetworkInterface.getByIndex(-1);
+            throw new RuntimeException("Should have thrown IllegalArgumentException");
+        } catch (IllegalArgumentException e) {
+            // OK
+        }
+        // In all likelyhood, this interface should not exist.
+        nif = NetworkInterface.getByIndex(Integer.MAX_VALUE - 1);
+        if (nif != null) {
+            throw new RuntimeException("getByIndex() should have returned null");
+        }
+    }
+}