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/*
* Copyright (C) 2019 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;
import static com.android.net.module.util.NetworkStackConstants.ARP_REQUEST;
import static com.android.net.module.util.NetworkStackConstants.ETHER_ADDR_LEN;
import static com.android.net.module.util.NetworkStackConstants.ETHER_BROADCAST;
import static com.android.testutils.MiscAsserts.assertThrows;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import android.net.InetAddresses;
import android.net.MacAddress;
import androidx.test.filters.SmallTest;
import androidx.test.runner.AndroidJUnit4;
import com.android.net.module.util.arp.ArpPacket;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.net.Inet4Address;
import java.nio.ByteBuffer;
@RunWith(AndroidJUnit4.class)
@SmallTest
public final class ArpPacketTest {
private static final Inet4Address TEST_IPV4_ADDR =
(Inet4Address) InetAddresses.parseNumericAddress("192.168.1.2");
private static final Inet4Address INADDR_ANY =
(Inet4Address) InetAddresses.parseNumericAddress("0.0.0.0");
private static final byte[] TEST_SENDER_MAC_ADDR = new byte[] {
0x00, 0x1a, 0x11, 0x22, 0x33, 0x33 };
private static final byte[] TEST_TARGET_MAC_ADDR = new byte[] {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
private static final byte[] TEST_ARP_PROBE = new byte[] {
// dst mac address
(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
// src mac address
(byte) 0x00, (byte) 0x1a, (byte) 0x11, (byte) 0x22, (byte) 0x33, (byte) 0x33,
// ether type
(byte) 0x08, (byte) 0x06,
// hardware type
(byte) 0x00, (byte) 0x01,
// protocol type
(byte) 0x08, (byte) 0x00,
// hardware address size
(byte) 0x06,
// protocol address size
(byte) 0x04,
// opcode
(byte) 0x00, (byte) 0x01,
// sender mac address
(byte) 0x00, (byte) 0x1a, (byte) 0x11, (byte) 0x22, (byte) 0x33, (byte) 0x33,
// sender IP address
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
// target mac address
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
// target IP address
(byte) 0xc0, (byte) 0xa8, (byte) 0x01, (byte) 0x02,
};
private static final byte[] TEST_ARP_ANNOUNCE = new byte[] {
// dst mac address
(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
// src mac address
(byte) 0x00, (byte) 0x1a, (byte) 0x11, (byte) 0x22, (byte) 0x33, (byte) 0x33,
// ether type
(byte) 0x08, (byte) 0x06,
// hardware type
(byte) 0x00, (byte) 0x01,
// protocol type
(byte) 0x08, (byte) 0x00,
// hardware address size
(byte) 0x06,
// protocol address size
(byte) 0x04,
// opcode
(byte) 0x00, (byte) 0x01,
// sender mac address
(byte) 0x00, (byte) 0x1a, (byte) 0x11, (byte) 0x22, (byte) 0x33, (byte) 0x33,
// sender IP address
(byte) 0xc0, (byte) 0xa8, (byte) 0x01, (byte) 0x02,
// target mac address
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
// target IP address
(byte) 0xc0, (byte) 0xa8, (byte) 0x01, (byte) 0x02,
};
private static final byte[] TEST_ARP_PROBE_TRUNCATED = new byte[] {
// dst mac address
(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
// src mac address
(byte) 0x00, (byte) 0x1a, (byte) 0x11, (byte) 0x22, (byte) 0x33, (byte) 0x33,
// ether type
(byte) 0x08, (byte) 0x06,
// hardware type
(byte) 0x00, (byte) 0x01,
// protocol type
(byte) 0x08, (byte) 0x00,
// hardware address size
(byte) 0x06,
// protocol address size
(byte) 0x04,
// opcode
(byte) 0x00,
};
private static final byte[] TEST_ARP_PROBE_TRUNCATED_MAC = new byte[] {
// dst mac address
(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
// src mac address
(byte) 0x00, (byte) 0x1a, (byte) 0x11, (byte) 0x22, (byte) 0x33, (byte) 0x33,
// ether type
(byte) 0x08, (byte) 0x06,
// hardware type
(byte) 0x00, (byte) 0x01,
// protocol type
(byte) 0x08, (byte) 0x00,
// hardware address size
(byte) 0x06,
// protocol address size
(byte) 0x04,
// opcode
(byte) 0x00, (byte) 0x01,
// sender mac address
(byte) 0x00, (byte) 0x1a, (byte) 0x11, (byte) 0x22, (byte) 0x33,
};
@Test
public void testBuildArpProbePacket() throws Exception {
final ByteBuffer arpProbe = ArpPacket.buildArpPacket(ETHER_BROADCAST,
TEST_SENDER_MAC_ADDR, TEST_IPV4_ADDR.getAddress(), new byte[ETHER_ADDR_LEN],
INADDR_ANY.getAddress(), (short) ARP_REQUEST);
assertArrayEquals(arpProbe.array(), TEST_ARP_PROBE);
}
@Test
public void testBuildArpAnnouncePacket() throws Exception {
final ByteBuffer arpAnnounce = ArpPacket.buildArpPacket(ETHER_BROADCAST,
TEST_SENDER_MAC_ADDR, TEST_IPV4_ADDR.getAddress(), new byte[ETHER_ADDR_LEN],
TEST_IPV4_ADDR.getAddress(), (short) ARP_REQUEST);
assertArrayEquals(arpAnnounce.array(), TEST_ARP_ANNOUNCE);
}
@Test
public void testParseArpProbePacket() throws Exception {
final ArpPacket packet = ArpPacket.parseArpPacket(TEST_ARP_PROBE, TEST_ARP_PROBE.length);
assertEquals(packet.opCode, ARP_REQUEST);
assertEquals(packet.senderHwAddress, MacAddress.fromBytes(TEST_SENDER_MAC_ADDR));
assertEquals(packet.targetHwAddress, MacAddress.fromBytes(TEST_TARGET_MAC_ADDR));
assertEquals(packet.senderIp, INADDR_ANY);
assertEquals(packet.targetIp, TEST_IPV4_ADDR);
}
@Test
public void testParseArpAnnouncePacket() throws Exception {
final ArpPacket packet = ArpPacket.parseArpPacket(TEST_ARP_ANNOUNCE,
TEST_ARP_ANNOUNCE.length);
assertEquals(packet.opCode, ARP_REQUEST);
assertEquals(packet.senderHwAddress, MacAddress.fromBytes(TEST_SENDER_MAC_ADDR));
assertEquals(packet.targetHwAddress, MacAddress.fromBytes(TEST_TARGET_MAC_ADDR));
assertEquals(packet.senderIp, TEST_IPV4_ADDR);
assertEquals(packet.targetIp, TEST_IPV4_ADDR);
}
@Test
public void testParseArpPacket_invalidByteBufferParameters() throws Exception {
assertThrows(ArpPacket.ParseException.class, () -> ArpPacket.parseArpPacket(
TEST_ARP_PROBE, 0));
}
@Test
public void testParseArpPacket_truncatedPacket() throws Exception {
assertThrows(ArpPacket.ParseException.class, () -> ArpPacket.parseArpPacket(
TEST_ARP_PROBE_TRUNCATED, TEST_ARP_PROBE_TRUNCATED.length));
}
@Test
public void testParseArpPacket_truncatedMacAddress() throws Exception {
assertThrows(ArpPacket.ParseException.class, () -> ArpPacket.parseArpPacket(
TEST_ARP_PROBE_TRUNCATED_MAC, TEST_ARP_PROBE_TRUNCATED.length));
}
}
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