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/*
* Copyright (c) 2013, 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.
*/
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.List;
/*
* @test
* @bug 8021372
* @summary Tests that the MAC addresses returned by NetworkInterface.getNetworkInterfaces are unique for each adapter.
*
*/
public class UniqueMacAddressesTest {
public static void main(String[] args) throws Exception {
new UniqueMacAddressesTest().execute();
System.out.println("UniqueMacAddressesTest: OK");
}
public UniqueMacAddressesTest() {
System.out.println("UniqueMacAddressesTest: start ");
}
public void execute() throws Exception {
Enumeration<NetworkInterface> networkInterfaces;
boolean areMacAddressesUnique = false;
List<NetworkInterface> networkInterfaceList = new ArrayList<NetworkInterface>();
networkInterfaces = NetworkInterface.getNetworkInterfaces();
// build a list of NetworkInterface objects to test MAC address
// uniqueness
createNetworkInterfaceList(networkInterfaces, networkInterfaceList);
areMacAddressesUnique = checkMacAddressesAreUnique(networkInterfaceList);
if (!areMacAddressesUnique) {
throw new RuntimeException("mac address uniqueness test failed");
}
}
private boolean checkMacAddressesAreUnique (
List<NetworkInterface> networkInterfaces) throws Exception {
boolean uniqueMacAddresses = true;
for (NetworkInterface networkInterface : networkInterfaces) {
for (NetworkInterface comparisonNetIf : networkInterfaces) {
System.out.println("Comparing netif "
+ networkInterface.getName() + " and netif "
+ comparisonNetIf.getName());
if (testMacAddressesEqual(networkInterface, comparisonNetIf)) {
uniqueMacAddresses = false;
break;
}
}
if (uniqueMacAddresses != true)
break;
}
return uniqueMacAddresses;
}
private boolean testMacAddressesEqual(NetworkInterface netIf1,
NetworkInterface netIf2) throws Exception {
byte[] rawMacAddress1 = null;
byte[] rawMacAddress2 = null;
boolean macAddressesEqual = false;
if (!netIf1.getName().equals(netIf2.getName())) {
System.out.println("compare hardware addresses "
+ createMacAddressString(netIf1) + " and " + createMacAddressString(netIf2));
rawMacAddress1 = netIf1.getHardwareAddress();
rawMacAddress2 = netIf2.getHardwareAddress();
macAddressesEqual = Arrays.equals(rawMacAddress1, rawMacAddress2);
} else {
// same interface
macAddressesEqual = false;
}
return macAddressesEqual;
}
private String createMacAddressString (NetworkInterface netIf) throws Exception {
byte[] macAddr = netIf.getHardwareAddress();
StringBuilder sb = new StringBuilder();
if (macAddr != null) {
for (int i = 0; i < macAddr.length; i++) {
sb.append(String.format("%02X%s", macAddr[i],
(i < macAddr.length - 1) ? "-" : ""));
}
}
return sb.toString();
}
private void createNetworkInterfaceList(Enumeration<NetworkInterface> nis,
List<NetworkInterface> networkInterfaceList) throws Exception {
byte[] macAddr = null;
NetworkInterface netIf = null;
while (nis.hasMoreElements()) {
netIf = (NetworkInterface) nis.nextElement();
if (netIf.isUp()) {
macAddr = netIf.getHardwareAddress();
if (macAddr != null) {
System.out.println("Adding NetworkInterface "
+ netIf.getName() + " with mac address "
+ createMacAddressString(netIf));
networkInterfaceList.add(netIf);
}
}
}
}
}
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