111 lines
4.2 KiB
Java
111 lines
4.2 KiB
Java
/*
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* Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.PrintStream;
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import java.io.UncheckedIOException;
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import java.net.NetworkInterface;
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import java.net.SocketException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import java.util.stream.Collectors;
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import jdk.test.lib.NetworkConfiguration;
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/*
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* @test
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* @bug 8021372
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* @summary Tests that the MAC addresses returned by NetworkInterface.getNetworkInterfaces are unique for each adapter.
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* @library /test/lib
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* @build jdk.test.lib.NetworkConfiguration
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* @run main/othervm UniqueMacAddressesTest
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*/
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public class UniqueMacAddressesTest {
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static PrintStream log = System.err;
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// A record pair (NetworkInterface::name, NetworkInterface::hardwareAddress)
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record NetIfPair(String interfaceName, byte[] address) {}
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public static void main(String[] args) throws Exception {
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new UniqueMacAddressesTest().execute();
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log.println("UniqueMacAddressesTest: OK");
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}
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public UniqueMacAddressesTest() {
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log.println("UniqueMacAddressesTest: start");
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}
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public void execute() throws Exception {
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// build a list of NetworkInterface name address pairs
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// to test MAC address uniqueness
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List<NetIfPair> netIfList = createNetworkInterfaceList(NetworkConfiguration.probe());
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if (!macAddressesAreUnique(netIfList))
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throw new RuntimeException("mac address uniqueness test failed");
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}
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private boolean macAddressesAreUnique(List<NetIfPair> netIfPairs) {
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for (NetIfPair netIfPair : netIfPairs) {
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for (NetIfPair compNetIfPair : netIfPairs) {
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if (!netIfPair.interfaceName.equals(compNetIfPair.interfaceName) &&
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testMacAddressesEqual(netIfPair, compNetIfPair))
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return false;
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}
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}
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return true;
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}
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private boolean testMacAddressesEqual(NetIfPair if1, NetIfPair if2) {
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log.println("Compare hardware addresses of " + if1.interfaceName + " ("
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+ createMacAddressString(if1.address) + ")" + " and " + if2.interfaceName
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+ " (" + createMacAddressString(if2.address) + ")");
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return (Arrays.equals(if1.address, if2.address));
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}
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private String createMacAddressString(byte[] macAddr) {
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StringBuilder sb = new StringBuilder();
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if (macAddr != null) {
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for (int i = 0; i < macAddr.length; i++) {
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sb.append(String.format("%02X%s", macAddr[i],
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(i < macAddr.length - 1) ? "-" : ""));
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}
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}
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return sb.toString();
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}
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private byte[] getNetworkInterfaceHardwareAddress(NetworkInterface inf) {
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try {
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return inf.getHardwareAddress();
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} catch (SocketException se) {
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throw new UncheckedIOException(se);
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}
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}
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private List<NetIfPair> createNetworkInterfaceList(NetworkConfiguration netConf) {
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return netConf.interfaces()
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.map(netIf -> new NetIfPair(netIf.getName(), getNetworkInterfaceHardwareAddress(netIf)))
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.collect(Collectors.filtering(netIfPair -> netIfPair.address != null,
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Collectors.toCollection(ArrayList::new)));
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}
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}
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