7161881: (dc) DatagramChannel.bind(null) fails if IPv4 socket and running with preferIPv6Addresses=true

Reviewed-by: alanb, chegar

jdk/src/share/classes/sun/nio/ch/DatagramChannelImpl.java

@@ -661,7 +661,12 @@ class DatagramChannelImpl
                         throw new AlreadyBoundException();
                     InetSocketAddress isa;
                     if (local == null) {
+                        // only Inet4Address allowed with IPv4 socket
+                        if (family == StandardProtocolFamily.INET) {
+                            isa = new InetSocketAddress(InetAddress.getByName("0.0.0.0"), 0);
+                        } else {
                             isa = new InetSocketAddress(0);
+                        }
                     } else {
                         isa = Net.checkAddress(local);
 

jdk/test/java/nio/channels/DatagramChannel/BindNull.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2012, 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 7161881
+ * @run main/othervm -Djava.net.preferIPv6Addresses=true BindNull
+ * @summary Make sure the bind method uses an ipv4 address for the null case
+ *          when the DatagramChannel is connected to an IPv4 socket and
+ *          -Djava.net.preferIPv6Addresses=true.
+ */
+
+import java.io.*;
+import java.net.*;
+import java.nio.channels.*;
+
+public class BindNull {
+    public static void main(String[] args) throws IOException {
+        try (DatagramChannel dc = DatagramChannel.open()) {
+            dc.bind(null);
+        }
+        try (DatagramChannel dc = DatagramChannel.open(StandardProtocolFamily.INET)) {
+            dc.bind(null);
+        }
+        try (DatagramChannel dc = DatagramChannel.open(StandardProtocolFamily.INET6)) {
+            dc.bind(null);
+        } catch (UnsupportedOperationException uoe) {
+            // IPv6 not available
+        }
+    }
+}