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/*
* Copyright (c) 2020, 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 8059309
* @summary Test that querrying the mac address of the loopback interface
* returns null and doesn't throw a SocketException.
* @library /test/lib
* @run testng/othervm NullMacAddress
* @run testng/othervm -Djava.net.preferIPv6Addresses=true NullMacAddress
* @run testng/othervm -Djava.net.preferIPv4Stack=true NullMacAddress
*/
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
import java.io.UncheckedIOException;
import java.math.BigInteger;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Locale;
import jdk.test.lib.net.IPSupport;
public class NullMacAddress {
@BeforeTest
void setup() {
IPSupport.throwSkippedExceptionIfNonOperational();
}
@Test
public void testNetworkInterfaces() throws SocketException {
NetworkInterface.networkInterfaces().forEach(this::testMacAddress);
}
private void testMacAddress(NetworkInterface ni) {
try {
var name = ni.getDisplayName();
System.out.println("Testing: " + name);
var loopback = ni.isLoopback();
var macAddress = ni.getHardwareAddress();
var hdr = macAddress == null ? "null"
: "0x" + new BigInteger(1, macAddress)
.toString(16).toUpperCase(Locale.ROOT);
System.out.println(" MAC address: " + hdr + (loopback ? " (loopback)" : ""));
if (loopback) {
assertNull(macAddress, "Loopback interface \""
+ name + "\" doesn't have a null MAC Address");
}
} catch (SocketException ex) {
throw new UncheckedIOException(ex);
}
}
}
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