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/*
* Copyright (C) 2015 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 android.net.dhcp;
import android.net.NetworkUtils;
import android.net.DhcpResults;
import android.net.LinkAddress;
import android.system.OsConstants;
import android.test.suitebuilder.annotation.SmallTest;
import junit.framework.TestCase;
import java.net.Inet4Address;
import java.nio.ByteBuffer;
import static android.net.dhcp.DhcpPacket.*;
public class DhcpPacketTest extends TestCase {
private static Inet4Address SERVER_ADDR =
(Inet4Address) NetworkUtils.numericToInetAddress("192.0.2.1");
private static Inet4Address CLIENT_ADDR =
(Inet4Address) NetworkUtils.numericToInetAddress("192.0.2.234");
// Use our own empty address instead of Inet4Address.ANY or INADDR_ANY to ensure that the code
// doesn't use == instead of equals when comparing addresses.
private static Inet4Address ANY = (Inet4Address) NetworkUtils.numericToInetAddress("0.0.0.0");
private static byte[] CLIENT_MAC = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
class TestDhcpPacket extends DhcpPacket {
private byte mType;
// TODO: Make this a map of option numbers to bytes instead.
private byte[] mDomainBytes, mVendorInfoBytes, mLeaseTimeBytes, mNetmaskBytes;
public TestDhcpPacket(byte type, Inet4Address clientIp, Inet4Address yourIp) {
super(0xdeadbeef, (short) 0, clientIp, yourIp, INADDR_ANY, INADDR_ANY,
CLIENT_MAC, true);
mType = type;
}
public TestDhcpPacket(byte type) {
this(type, INADDR_ANY, CLIENT_ADDR);
}
public TestDhcpPacket setDomainBytes(byte[] domainBytes) {
mDomainBytes = domainBytes;
return this;
}
public TestDhcpPacket setVendorInfoBytes(byte[] vendorInfoBytes) {
mVendorInfoBytes = vendorInfoBytes;
return this;
}
public TestDhcpPacket setLeaseTimeBytes(byte[] leaseTimeBytes) {
mLeaseTimeBytes = leaseTimeBytes;
return this;
}
public TestDhcpPacket setNetmaskBytes(byte[] netmaskBytes) {
mNetmaskBytes = netmaskBytes;
return this;
}
public ByteBuffer buildPacket(int encap, short unusedDestUdp, short unusedSrcUdp) {
ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
fillInPacket(encap, CLIENT_ADDR, SERVER_ADDR,
DHCP_CLIENT, DHCP_SERVER, result, DHCP_BOOTREPLY, false);
return result;
}
public void finishPacket(ByteBuffer buffer) {
addTlv(buffer, DHCP_MESSAGE_TYPE, mType);
if (mDomainBytes != null) {
addTlv(buffer, DHCP_DOMAIN_NAME, mDomainBytes);
}
if (mVendorInfoBytes != null) {
addTlv(buffer, DHCP_VENDOR_CLASS_ID, mVendorInfoBytes);
}
if (mLeaseTimeBytes != null) {
addTlv(buffer, DHCP_LEASE_TIME, mLeaseTimeBytes);
}
if (mNetmaskBytes != null) {
addTlv(buffer, DHCP_SUBNET_MASK, mNetmaskBytes);
}
addTlvEnd(buffer);
}
// Convenience method.
public ByteBuffer build() {
// ENCAP_BOOTP packets don't contain ports, so just pass in 0.
ByteBuffer pkt = buildPacket(ENCAP_BOOTP, (short) 0, (short) 0);
pkt.flip();
return pkt;
}
}
private void assertDomainAndVendorInfoParses(
String expectedDomain, byte[] domainBytes,
String expectedVendorInfo, byte[] vendorInfoBytes) {
ByteBuffer packet = new TestDhcpPacket(DHCP_MESSAGE_TYPE_OFFER)
.setDomainBytes(domainBytes)
.setVendorInfoBytes(vendorInfoBytes)
.build();
DhcpPacket offerPacket = DhcpPacket.decodeFullPacket(packet, ENCAP_BOOTP);
assertEquals(expectedDomain, offerPacket.mDomainName);
assertEquals(expectedVendorInfo, offerPacket.mVendorId);
}
@SmallTest
public void testDomainName() throws Exception {
byte[] nullByte = new byte[] { 0x00 };
byte[] twoNullBytes = new byte[] { 0x00, 0x00 };
byte[] nonNullDomain = new byte[] {
(byte) 'g', (byte) 'o', (byte) 'o', (byte) '.', (byte) 'g', (byte) 'l'
};
byte[] trailingNullDomain = new byte[] {
(byte) 'g', (byte) 'o', (byte) 'o', (byte) '.', (byte) 'g', (byte) 'l', 0x00
};
byte[] embeddedNullsDomain = new byte[] {
(byte) 'g', (byte) 'o', (byte) 'o', 0x00, 0x00, (byte) 'g', (byte) 'l'
};
byte[] metered = "ANDROID_METERED".getBytes("US-ASCII");
byte[] meteredEmbeddedNull = metered.clone();
meteredEmbeddedNull[7] = (char) 0;
byte[] meteredTrailingNull = metered.clone();
meteredTrailingNull[meteredTrailingNull.length - 1] = (char) 0;
assertDomainAndVendorInfoParses("", nullByte, "\u0000", nullByte);
assertDomainAndVendorInfoParses("", twoNullBytes, "\u0000\u0000", twoNullBytes);
assertDomainAndVendorInfoParses("goo.gl", nonNullDomain, "ANDROID_METERED", metered);
assertDomainAndVendorInfoParses("goo", embeddedNullsDomain,
"ANDROID\u0000METERED", meteredEmbeddedNull);
assertDomainAndVendorInfoParses("goo.gl", trailingNullDomain,
"ANDROID_METERE\u0000", meteredTrailingNull);
}
private void assertLeaseTimeParses(boolean expectValid, Integer rawLeaseTime,
long leaseTimeMillis, byte[] leaseTimeBytes) {
TestDhcpPacket testPacket = new TestDhcpPacket(DHCP_MESSAGE_TYPE_OFFER);
if (leaseTimeBytes != null) {
testPacket.setLeaseTimeBytes(leaseTimeBytes);
}
ByteBuffer packet = testPacket.build();
DhcpPacket offerPacket = DhcpPacket.decodeFullPacket(packet, ENCAP_BOOTP);
if (!expectValid) {
assertNull(offerPacket);
return;
}
assertEquals(rawLeaseTime, offerPacket.mLeaseTime);
DhcpResults dhcpResults = offerPacket.toDhcpResults(); // Just check this doesn't crash.
assertEquals(leaseTimeMillis, offerPacket.getLeaseTimeMillis());
}
@SmallTest
public void testLeaseTime() throws Exception {
byte[] noLease = null;
byte[] tooShortLease = new byte[] { 0x00, 0x00 };
byte[] tooLongLease = new byte[] { 0x00, 0x00, 0x00, 60, 0x01 };
byte[] zeroLease = new byte[] { 0x00, 0x00, 0x00, 0x00 };
byte[] tenSecondLease = new byte[] { 0x00, 0x00, 0x00, 10 };
byte[] oneMinuteLease = new byte[] { 0x00, 0x00, 0x00, 60 };
byte[] fiveMinuteLease = new byte[] { 0x00, 0x00, 0x01, 0x2c };
byte[] oneDayLease = new byte[] { 0x00, 0x01, 0x51, (byte) 0x80 };
byte[] maxIntPlusOneLease = new byte[] { (byte) 0x80, 0x00, 0x00, 0x01 };
byte[] infiniteLease = new byte[] { (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff };
assertLeaseTimeParses(true, null, 0, noLease);
assertLeaseTimeParses(false, null, 0, tooShortLease);
assertLeaseTimeParses(false, null, 0, tooLongLease);
assertLeaseTimeParses(true, 0, 60 * 1000, zeroLease);
assertLeaseTimeParses(true, 10, 60 * 1000, tenSecondLease);
assertLeaseTimeParses(true, 60, 60 * 1000, oneMinuteLease);
assertLeaseTimeParses(true, 300, 300 * 1000, fiveMinuteLease);
assertLeaseTimeParses(true, 86400, 86400 * 1000, oneDayLease);
assertLeaseTimeParses(true, -2147483647, 2147483649L * 1000, maxIntPlusOneLease);
assertLeaseTimeParses(true, DhcpPacket.INFINITE_LEASE, 0, infiniteLease);
}
private void checkIpAddress(String expected, Inet4Address clientIp, Inet4Address yourIp,
byte[] netmaskBytes) {
checkIpAddress(expected, DHCP_MESSAGE_TYPE_OFFER, clientIp, yourIp, netmaskBytes);
checkIpAddress(expected, DHCP_MESSAGE_TYPE_ACK, clientIp, yourIp, netmaskBytes);
}
private void checkIpAddress(String expected, byte type,
Inet4Address clientIp, Inet4Address yourIp,
byte[] netmaskBytes) {
ByteBuffer packet = new TestDhcpPacket(type, clientIp, yourIp)
.setNetmaskBytes(netmaskBytes)
.build();
DhcpPacket offerPacket = DhcpPacket.decodeFullPacket(packet, ENCAP_BOOTP);
DhcpResults results = offerPacket.toDhcpResults();
if (expected != null) {
LinkAddress expectedAddress = new LinkAddress(expected);
assertEquals(expectedAddress, results.ipAddress);
} else {
assertNull(results);
}
}
@SmallTest
public void testIpAddress() throws Exception {
byte[] slash11Netmask = new byte[] { (byte) 0xff, (byte) 0xe0, 0x00, 0x00 };
byte[] slash24Netmask = new byte[] { (byte) 0xff, (byte) 0xff, (byte) 0xff, 0x00 };
byte[] invalidNetmask = new byte[] { (byte) 0xff, (byte) 0xfb, (byte) 0xff, 0x00 };
Inet4Address example1 = (Inet4Address) NetworkUtils.numericToInetAddress("192.0.2.1");
Inet4Address example2 = (Inet4Address) NetworkUtils.numericToInetAddress("192.0.2.43");
// A packet without any addresses is not valid.
checkIpAddress(null, ANY, ANY, slash24Netmask);
// ClientIP is used iff YourIP is not present.
checkIpAddress("192.0.2.1/24", example2, example1, slash24Netmask);
checkIpAddress("192.0.2.43/11", example2, ANY, slash11Netmask);
checkIpAddress("192.0.2.43/11", ANY, example2, slash11Netmask);
// Invalid netmasks are ignored.
checkIpAddress(null, example2, ANY, invalidNetmask);
// If there is no netmask, implicit netmasks are used.
checkIpAddress("192.0.2.43/24", ANY, example2, null);
}
}
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