93dd5e6964
Use SecureRandom instead of Random since Random is time based and can increase the chance of generating same MAC address across multiple devices. createRandomUnicastAddress should randomize all bits of the address, except for locally assigned bit and unicast bit. The previous method that only randomizes NIC and use Google Base OUI is renamed to createRandomUnicastAddressWithGoogleBase. Bug: 72450936 Test: runtest frameworks-net Change-Id: Icda650638c2c1c9fd90d509a87e86347c0e05f2d
263 lines
9.3 KiB
Java
263 lines
9.3 KiB
Java
/*
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* Copyright 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.fail;
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import android.support.test.filters.SmallTest;
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import android.support.test.runner.AndroidJUnit4;
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import java.util.Arrays;
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import java.util.Random;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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@SmallTest
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@RunWith(AndroidJUnit4.class)
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public class MacAddressTest {
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static class AddrTypeTestCase {
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byte[] addr;
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int expectedType;
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static AddrTypeTestCase of(int expectedType, int... addr) {
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AddrTypeTestCase t = new AddrTypeTestCase();
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t.expectedType = expectedType;
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t.addr = toByteArray(addr);
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return t;
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}
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}
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@Test
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public void testMacAddrTypes() {
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AddrTypeTestCase[] testcases = {
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AddrTypeTestCase.of(MacAddress.TYPE_UNKNOWN),
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AddrTypeTestCase.of(MacAddress.TYPE_UNKNOWN, 0),
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AddrTypeTestCase.of(MacAddress.TYPE_UNKNOWN, 1, 2, 3, 4, 5),
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AddrTypeTestCase.of(MacAddress.TYPE_UNKNOWN, 1, 2, 3, 4, 5, 6, 7),
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AddrTypeTestCase.of(MacAddress.TYPE_UNICAST, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0, 0xf0),
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AddrTypeTestCase.of(MacAddress.TYPE_BROADCAST, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff),
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AddrTypeTestCase.of(MacAddress.TYPE_MULTICAST, 1, 2, 3, 4, 5, 6),
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AddrTypeTestCase.of(MacAddress.TYPE_MULTICAST, 11, 22, 33, 44, 55, 66),
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AddrTypeTestCase.of(MacAddress.TYPE_MULTICAST, 33, 33, 0xaa, 0xbb, 0xcc, 0xdd)
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};
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for (AddrTypeTestCase t : testcases) {
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int got = MacAddress.macAddressType(t.addr);
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String msg = String.format("expected type of %s to be %s, but got %s",
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Arrays.toString(t.addr), t.expectedType, got);
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assertEquals(msg, t.expectedType, got);
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if (got != MacAddress.TYPE_UNKNOWN) {
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assertEquals(got, MacAddress.fromBytes(t.addr).getAddressType());
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}
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}
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}
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@Test
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public void testToOuiString() {
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String[][] macs = {
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{"07:00:d3:56:8a:c4", "07:00:d3"},
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{"33:33:aa:bb:cc:dd", "33:33:aa"},
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{"06:00:00:00:00:00", "06:00:00"},
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{"07:00:d3:56:8a:c4", "07:00:d3"}
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};
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for (String[] pair : macs) {
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String mac = pair[0];
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String expected = pair[1];
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assertEquals(expected, MacAddress.fromString(mac).toOuiString());
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}
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}
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@Test
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public void testHexPaddingWhenPrinting() {
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String[] macs = {
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"07:00:d3:56:8a:c4",
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"33:33:aa:bb:cc:dd",
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"06:00:00:00:00:00",
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"07:00:d3:56:8a:c4"
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};
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for (String mac : macs) {
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assertEquals(mac, MacAddress.fromString(mac).toString());
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assertEquals(mac,
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MacAddress.stringAddrFromByteAddr(MacAddress.byteAddrFromStringAddr(mac)));
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}
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}
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@Test
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public void testIsMulticastAddress() {
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MacAddress[] multicastAddresses = {
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MacAddress.BROADCAST_ADDRESS,
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MacAddress.fromString("07:00:d3:56:8a:c4"),
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MacAddress.fromString("33:33:aa:bb:cc:dd"),
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};
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MacAddress[] unicastAddresses = {
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MacAddress.ALL_ZEROS_ADDRESS,
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MacAddress.fromString("00:01:44:55:66:77"),
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MacAddress.fromString("08:00:22:33:44:55"),
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MacAddress.fromString("06:00:00:00:00:00"),
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};
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for (MacAddress mac : multicastAddresses) {
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String msg = mac.toString() + " expected to be a multicast address";
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assertTrue(msg, mac.isMulticastAddress());
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}
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for (MacAddress mac : unicastAddresses) {
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String msg = mac.toString() + " expected not to be a multicast address";
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assertFalse(msg, mac.isMulticastAddress());
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}
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}
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@Test
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public void testIsLocallyAssignedAddress() {
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MacAddress[] localAddresses = {
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MacAddress.fromString("06:00:00:00:00:00"),
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MacAddress.fromString("07:00:d3:56:8a:c4"),
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MacAddress.fromString("33:33:aa:bb:cc:dd"),
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};
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MacAddress[] universalAddresses = {
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MacAddress.fromString("00:01:44:55:66:77"),
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MacAddress.fromString("08:00:22:33:44:55"),
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};
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for (MacAddress mac : localAddresses) {
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String msg = mac.toString() + " expected to be a locally assigned address";
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assertTrue(msg, mac.isLocallyAssigned());
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}
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for (MacAddress mac : universalAddresses) {
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String msg = mac.toString() + " expected not to be globally unique address";
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assertFalse(msg, mac.isLocallyAssigned());
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}
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}
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@Test
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public void testMacAddressConversions() {
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final int iterations = 10000;
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for (int i = 0; i < iterations; i++) {
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MacAddress mac = MacAddress.createRandomUnicastAddress();
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String stringRepr = mac.toString();
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byte[] bytesRepr = mac.toByteArray();
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assertEquals(mac, MacAddress.fromString(stringRepr));
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assertEquals(mac, MacAddress.fromBytes(bytesRepr));
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assertEquals(mac, MacAddress.fromString(MacAddress.stringAddrFromByteAddr(bytesRepr)));
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assertEquals(mac, MacAddress.fromBytes(MacAddress.byteAddrFromStringAddr(stringRepr)));
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}
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}
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@Test
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public void testMacAddressRandomGeneration() {
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final int iterations = 1000;
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final String expectedAndroidOui = "da:a1:19";
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for (int i = 0; i < iterations; i++) {
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MacAddress mac = MacAddress.createRandomUnicastAddressWithGoogleBase();
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String stringRepr = mac.toString();
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assertTrue(stringRepr + " expected to be a locally assigned address",
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mac.isLocallyAssigned());
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assertTrue(stringRepr + " expected to begin with " + expectedAndroidOui,
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stringRepr.startsWith(expectedAndroidOui));
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}
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final Random r = new Random();
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final String anotherOui = "24:5f:78";
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final String expectedLocalOui = "26:5f:78";
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final MacAddress base = MacAddress.fromString(anotherOui + ":0:0:0");
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for (int i = 0; i < iterations; i++) {
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MacAddress mac = MacAddress.createRandomUnicastAddress(base, r);
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String stringRepr = mac.toString();
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assertTrue(stringRepr + " expected to be a locally assigned address",
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mac.isLocallyAssigned());
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assertEquals(MacAddress.TYPE_UNICAST, mac.getAddressType());
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assertTrue(stringRepr + " expected to begin with " + expectedLocalOui,
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stringRepr.startsWith(expectedLocalOui));
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}
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for (int i = 0; i < iterations; i++) {
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MacAddress mac = MacAddress.createRandomUnicastAddress();
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String stringRepr = mac.toString();
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assertTrue(stringRepr + " expected to be a locally assigned address",
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mac.isLocallyAssigned());
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assertEquals(MacAddress.TYPE_UNICAST, mac.getAddressType());
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}
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}
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@Test
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public void testConstructorInputValidation() {
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String[] invalidStringAddresses = {
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"",
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"abcd",
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"1:2:3:4:5",
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"1:2:3:4:5:6:7",
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"10000:2:3:4:5:6",
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};
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for (String s : invalidStringAddresses) {
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try {
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MacAddress mac = MacAddress.fromString(s);
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fail("MacAddress.fromString(" + s + ") should have failed, but returned " + mac);
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} catch (IllegalArgumentException excepted) {
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}
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}
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try {
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MacAddress mac = MacAddress.fromString(null);
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fail("MacAddress.fromString(null) should have failed, but returned " + mac);
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} catch (NullPointerException excepted) {
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}
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byte[][] invalidBytesAddresses = {
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{},
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{1,2,3,4,5},
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{1,2,3,4,5,6,7},
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};
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for (byte[] b : invalidBytesAddresses) {
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try {
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MacAddress mac = MacAddress.fromBytes(b);
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fail("MacAddress.fromBytes(" + Arrays.toString(b)
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+ ") should have failed, but returned " + mac);
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} catch (IllegalArgumentException excepted) {
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}
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}
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try {
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MacAddress mac = MacAddress.fromBytes(null);
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fail("MacAddress.fromBytes(null) should have failed, but returned " + mac);
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} catch (NullPointerException excepted) {
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}
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}
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static byte[] toByteArray(int... in) {
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byte[] out = new byte[in.length];
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for (int i = 0; i < in.length; i++) {
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out[i] = (byte) in[i];
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}
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return out;
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}
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}
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