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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.net.module.util.netlink;
import static com.android.net.module.util.NetworkStackConstants.ICMPV6_ND_OPTION_RDNSS;
import static com.android.testutils.MiscAsserts.assertThrows;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import android.net.InetAddresses;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import com.android.net.module.util.structs.RdnssOption;
import libcore.util.HexEncoding;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.net.Inet6Address;
import java.nio.ByteBuffer;
@RunWith(AndroidJUnit4.class)
@SmallTest
public class StructNdOptRdnssTest {
private static final String DNS_SERVER1 = "2001:4860:4860::64";
private static final String DNS_SERVER2 = "2001:4860:4860::6464";
private static final Inet6Address[] DNS_SERVER_ADDRESSES = new Inet6Address[] {
(Inet6Address) InetAddresses.parseNumericAddress(DNS_SERVER1),
(Inet6Address) InetAddresses.parseNumericAddress(DNS_SERVER2),
};
private static final String RDNSS_OPTION_BYTES =
"1905" // type=25, len=5 (40 bytes)
+ "0000" // reserved
+ "00000E10" // lifetime=3600
+ "20014860486000000000000000000064" // 2001:4860:4860::64
+ "20014860486000000000000000006464"; // 2001:4860:4860::6464
private static final String RDNSS_INFINITY_LIFETIME_OPTION_BYTES =
"1905" // type=25, len=3 (24 bytes)
+ "0000" // reserved
+ "FFFFFFFF" // lifetime=0xffffffff
+ "20014860486000000000000000000064" // 2001:4860:4860::64
+ "20014860486000000000000000006464"; // 2001:4860:4860::6464
private void assertRdnssOptMatches(final StructNdOptRdnss opt, int length, long lifetime,
final Inet6Address[] servers) {
assertEquals(StructNdOptRdnss.TYPE, opt.type);
assertEquals(length, opt.length);
assertEquals(lifetime, opt.header.lifetime);
assertEquals(servers, opt.servers);
}
private ByteBuffer makeRdnssOption(byte type, byte length, long lifetime, String... servers)
throws Exception {
final ByteBuffer buf = ByteBuffer.allocate(8 + servers.length * 16)
.put(type)
.put(length)
.putShort((short) 0) // Reserved
.putInt((int) (lifetime & 0xFFFFFFFFL));
for (int i = 0; i < servers.length; i++) {
final byte[] rawBytes =
((Inet6Address) InetAddresses.parseNumericAddress(servers[i])).getAddress();
buf.put(rawBytes);
}
buf.flip();
return buf;
}
private void assertToByteBufferMatches(StructNdOptRdnss opt, String expected) {
String actual = HexEncoding.encodeToString(opt.toByteBuffer().array());
assertEquals(expected, actual);
}
private void doRdnssOptionParsing(final String optionHexString, int length, long lifetime,
final Inet6Address[] servers) {
final byte[] rawBytes = HexEncoding.decode(optionHexString);
final StructNdOptRdnss opt = StructNdOptRdnss.parse(ByteBuffer.wrap(rawBytes));
assertRdnssOptMatches(opt, length, lifetime, servers);
assertToByteBufferMatches(opt, optionHexString);
}
@Test
public void testParsing() throws Exception {
doRdnssOptionParsing(RDNSS_OPTION_BYTES, 5 /* length */, 3600 /* lifetime */,
DNS_SERVER_ADDRESSES);
}
@Test
public void testParsing_infinityLifetime() throws Exception {
doRdnssOptionParsing(RDNSS_INFINITY_LIFETIME_OPTION_BYTES, 5 /* length */,
0xffffffffL /* lifetime */, DNS_SERVER_ADDRESSES);
}
@Test
public void testToByteBuffer() {
final StructNdOptRdnss rdnss = new StructNdOptRdnss(DNS_SERVER_ADDRESSES, 3600);
assertToByteBufferMatches(rdnss, RDNSS_OPTION_BYTES);
}
@Test
public void testToByteBuffer_infinityLifetime() {
final StructNdOptRdnss rdnss = new StructNdOptRdnss(DNS_SERVER_ADDRESSES, 0xffffffffL);
assertToByteBufferMatches(rdnss, RDNSS_INFINITY_LIFETIME_OPTION_BYTES);
}
@Test
public void testParsing_invalidType() throws Exception {
final ByteBuffer buf = makeRdnssOption((byte) 38, (byte) 5 /* length */,
3600 /* lifetime */, DNS_SERVER1, DNS_SERVER2);
assertNull(StructNdOptRdnss.parse(buf));
}
@Test
public void testParsing_smallOptionLength() throws Exception {
final ByteBuffer buf = makeRdnssOption((byte) ICMPV6_ND_OPTION_RDNSS,
(byte) 2 /* length */, 3600 /* lifetime */, DNS_SERVER1, DNS_SERVER2);
assertNull(StructNdOptRdnss.parse(buf));
}
@Test
public void testParsing_oddOptionLength() throws Exception {
final ByteBuffer buf = makeRdnssOption((byte) ICMPV6_ND_OPTION_RDNSS,
(byte) 6 /* length */, 3600 /* lifetime */, DNS_SERVER1, DNS_SERVER2);
assertNull(StructNdOptRdnss.parse(buf));
}
@Test
public void testParsing_truncatedByteBuffer() throws Exception {
ByteBuffer buf = makeRdnssOption((byte) ICMPV6_ND_OPTION_RDNSS,
(byte) 5 /* length */, 3600 /* lifetime */, DNS_SERVER1, DNS_SERVER2);
final int len = buf.limit();
for (int i = 0; i < buf.limit() - 1; i++) {
buf.flip();
buf.limit(i);
assertNull("Option truncated to " + i + " bytes, should have returned null",
StructNdOptRdnss.parse(buf));
}
buf.flip();
buf.limit(len);
final StructNdOptRdnss opt = StructNdOptRdnss.parse(buf);
assertRdnssOptMatches(opt, 5 /* length */, 3600 /* lifetime */, DNS_SERVER_ADDRESSES);
}
@Test
public void testParsing_invalidByteBufferLength() throws Exception {
final ByteBuffer buf = makeRdnssOption((byte) ICMPV6_ND_OPTION_RDNSS,
(byte) 5 /* length */, 3600 /* lifetime */, DNS_SERVER1, DNS_SERVER2);
buf.limit(20); // less than MIN_OPT_LEN * 8
assertNull(StructNdOptRdnss.parse(buf));
}
@Test
public void testConstructor_nullDnsServerAddressArray() {
assertThrows(NullPointerException.class,
() -> new StructNdOptRdnss(null /* servers */, 3600 /* lifetime */));
}
@Test
public void testConstructor_emptyDnsServerAddressArray() {
assertThrows(IllegalArgumentException.class,
() -> new StructNdOptRdnss(new Inet6Address[0] /* empty server array */,
3600 /* lifetime*/));
}
@Test
public void testToString() {
final ByteBuffer buf = RdnssOption.build(3600 /* lifetime */, DNS_SERVER1, DNS_SERVER2);
final StructNdOptRdnss opt = StructNdOptRdnss.parse(buf);
final String expected = "NdOptRdnss(type: 25, length: 5, reserved: 0, lifetime: 3600,"
+ "servers:[2001:4860:4860::64,2001:4860:4860::6464])";
assertRdnssOptMatches(opt, 5 /* length */, 3600 /* lifetime */, DNS_SERVER_ADDRESSES);
assertEquals(expected, opt.toString());
}
}
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