[SEBA-593] Splitting dhcpl2relay app in implementation and api bundles
Change-Id: Ia9c060eeac3d74dc6829d774d32d288da0df203e
diff --git a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTest.java b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTest.java
new file mode 100755
index 0000000..17fb417
--- /dev/null
+++ b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTest.java
@@ -0,0 +1,433 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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 org.opencord.dhcpl2relay.impl;
+
+import static org.junit.Assert.assertEquals;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+import java.util.Set;
+
+import org.easymock.EasyMock;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.junit.TestUtils;
+import org.onlab.osgi.ComponentContextAdapter;
+import org.onlab.packet.ChassisId;
+import org.onlab.packet.DHCP;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.IPv4;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.UDP;
+import org.onlab.packet.VlanId;
+import org.onlab.packet.dhcp.DhcpOption;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.common.event.impl.TestEventDispatcher;
+import org.onosproject.mastership.MastershipServiceAdapter;
+import org.onosproject.net.AnnotationKeys;
+import org.onosproject.net.Annotations;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.DefaultDevice;
+import org.onosproject.net.DefaultHost;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Element;
+import org.onosproject.net.Host;
+import org.onosproject.net.HostId;
+import org.onosproject.net.HostLocation;
+import org.onosproject.net.Port;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.config.Config;
+import org.onosproject.net.config.NetworkConfigRegistryAdapter;
+import org.onosproject.net.device.DeviceServiceAdapter;
+import org.onosproject.net.flowobjective.FlowObjectiveServiceAdapter;
+import org.onosproject.net.host.HostServiceAdapter;
+import org.onosproject.net.provider.ProviderId;
+import org.opencord.dhcpl2relay.impl.packet.DhcpOption82;
+import org.opencord.sadis.SubscriberAndDeviceInformation;
+import org.opencord.sadis.BandwidthProfileInformation;
+import org.opencord.sadis.BaseInformationService;
+import org.opencord.sadis.SadisService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+
+public class DhcpL2RelayTest extends DhcpL2RelayTestBase {
+
+ private final Logger log = LoggerFactory.getLogger(getClass());
+
+ private DhcpL2Relay dhcpL2Relay;
+
+ private static final MacAddress CLIENT_MAC = MacAddress.valueOf("00:00:00:00:00:01");
+ private static final VlanId CLIENT_C_TAG = VlanId.vlanId((short) 999);
+ private static final VlanId CLIENT_S_TAG = VlanId.vlanId((short) 111);
+ private static final String CLIENT_NAS_PORT_ID = "PON 1/1";
+ private static final String CLIENT_CIRCUIT_ID = "CIR-PON 1/1";
+
+ private static final String OLT_DEV_ID = "of:00000000000000aa";
+ private static final MacAddress OLT_MAC_ADDRESS = MacAddress.valueOf("01:02:03:04:05:06");
+ private static final DeviceId DEVICE_ID_1 = DeviceId.deviceId(OLT_DEV_ID);
+
+ private static final ConnectPoint SERVER_CONNECT_POINT =
+ ConnectPoint.deviceConnectPoint("of:0000000000000001/5");
+
+ private static final String SCHEME_NAME = "dhcpl2relay";
+ private static final DefaultAnnotations DEVICE_ANNOTATIONS = DefaultAnnotations.builder()
+ .set(AnnotationKeys.PROTOCOL, SCHEME_NAME.toUpperCase()).build();
+
+ ComponentConfigService mockConfigService =
+ EasyMock.createMock(ComponentConfigService.class);
+
+ /**
+ * Sets up the services required by the dhcpl2relay app.
+ */
+ @Before
+ public void setUp() {
+ dhcpL2Relay = new DhcpL2Relay();
+ dhcpL2Relay.cfgService = new TestNetworkConfigRegistry();
+ dhcpL2Relay.coreService = new MockCoreServiceAdapter();
+ dhcpL2Relay.flowObjectiveService = new FlowObjectiveServiceAdapter();
+ dhcpL2Relay.packetService = new MockPacketService();
+ dhcpL2Relay.componentConfigService = mockConfigService;
+ dhcpL2Relay.deviceService = new MockDeviceService();
+ dhcpL2Relay.sadisService = new MockSadisService();
+ dhcpL2Relay.hostService = new MockHostService();
+ dhcpL2Relay.mastershipService = new MockMastershipService();
+ TestUtils.setField(dhcpL2Relay, "eventDispatcher", new TestEventDispatcher());
+ dhcpL2Relay.activate(new ComponentContextAdapter());
+ }
+
+ /**
+ * Tears down the dhcpL2Relay application.
+ */
+ @After
+ public void tearDown() {
+ dhcpL2Relay.deactivate();
+ }
+
+ /**
+ * Tests the DHCP relay app by sending DHCP discovery Packet.
+ *
+ * @throws Exception when an unhandled error occurs
+ */
+ @Test
+ public void testDhcpDiscover() throws Exception {
+ // (1) Sending DHCP discover packet
+ System.out.println("Sending pakcet");
+ Ethernet discoverPacket = constructDhcpDiscoverPacket(CLIENT_MAC);
+
+ sendPacket(discoverPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+
+ Ethernet discoverRelayed = (Ethernet) getPacket();
+ compareClientPackets(discoverPacket, discoverRelayed);
+ }
+
+ /**
+ * Tests the DHCP relay app by sending DHCP Request Packet.
+ *
+ * @throws Exception when an unhandled error occurs
+ */
+ @Test
+ public void testDhcpRequest() throws Exception {
+ // (1) Sending DHCP discover packet
+ System.out.println("Sending pakcet");
+ Ethernet requestPacket = constructDhcpRequestPacket(CLIENT_MAC);
+
+ sendPacket(requestPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+
+ Ethernet requestRelayed = (Ethernet) getPacket();
+ compareClientPackets(requestPacket, requestRelayed);
+ }
+
+ /**
+ * Tests the DHCP relay app by sending DHCP Offer Packet.
+ *
+ * @throws Exception when an unhandled error occurs
+ */
+ @Test
+ public void testDhcpOffer() {
+ // (1) Sending DHCP discover packet
+ System.out.println("Sending pakcet");
+ Ethernet offerPacket = constructDhcpOfferPacket(MacAddress.valueOf("bb:bb:bb:bb:bb:bb"),
+ CLIENT_MAC, "1.1.1.1", "2.2.2.2");
+
+ sendPacket(offerPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+
+ Ethernet offerRelayed = (Ethernet) getPacket();
+ compareServerPackets(offerPacket, offerRelayed);
+ }
+
+ /**
+ * Tests the DHCP relay app by sending DHCP Ack Packet.
+ *
+ * @throws Exception when an unhandled error occurs
+ */
+ @Test
+ public void testDhcpAck() {
+
+ Ethernet ackPacket = constructDhcpAckPacket(MacAddress.valueOf("bb:bb:bb:bb:bb:bb"),
+ CLIENT_MAC, "1.1.1.1", "2.2.2.2");
+
+ sendPacket(ackPacket, ConnectPoint.deviceConnectPoint(OLT_DEV_ID + "/" + 1));
+
+ Ethernet ackRelayed = (Ethernet) getPacket();
+ compareServerPackets(ackPacket, ackRelayed);
+ }
+
+ public void compareClientPackets(Ethernet sent, Ethernet relayed) {
+ sent.setSourceMACAddress(OLT_MAC_ADDRESS);
+ sent.setQinQVID(CLIENT_S_TAG.toShort());
+ sent.setVlanID(CLIENT_C_TAG.toShort());
+
+ IPv4 ipv4Packet = (IPv4) sent.getPayload();
+ UDP udpPacket = (UDP) ipv4Packet.getPayload();
+ DHCP dhcpPacket = (DHCP) udpPacket.getPayload();
+
+ List<DhcpOption> options = Lists.newArrayList(dhcpPacket.getOptions());
+ DhcpOption82 option82 = new DhcpOption82();
+ option82.setAgentCircuitId(CLIENT_CIRCUIT_ID);
+
+ DhcpOption option = new DhcpOption()
+ .setCode(DHCP.DHCPOptionCode.OptionCode_CircuitID.getValue())
+ .setData(option82.toByteArray())
+ .setLength(option82.length());
+
+ options.add(options.size() - 1, option);
+ dhcpPacket.setOptions(options);
+ assertEquals(sent, relayed);
+
+ }
+
+ public void compareServerPackets(Ethernet sent, Ethernet relayed) {
+ sent.setDestinationMACAddress(CLIENT_MAC);
+ sent.setQinQVID(CLIENT_S_TAG.toShort());
+ sent.setVlanID(CLIENT_C_TAG.toShort());
+
+ final ByteBuffer byteBuffer = ByteBuffer.wrap(sent.serialize());
+ Ethernet expectedPacket = null;
+ try {
+ expectedPacket = Ethernet.deserializer().deserialize(byteBuffer.array(),
+ 0, byteBuffer.array().length);
+ } catch (Exception e) {
+ }
+ assertEquals(expectedPacket, relayed);
+
+ }
+
+ private class MockDevice extends DefaultDevice {
+
+ public MockDevice(ProviderId providerId, DeviceId id, Type type,
+ String manufacturer, String hwVersion, String swVersion,
+ String serialNumber, ChassisId chassisId, Annotations... annotations) {
+ super(providerId, id, type, manufacturer, hwVersion, swVersion, serialNumber,
+ chassisId, annotations);
+ }
+ }
+
+ private class MockDeviceService extends DeviceServiceAdapter {
+
+ private ProviderId providerId = new ProviderId("of", "foo");
+ private final Device device1 = new MockDevice(providerId, DEVICE_ID_1, Device.Type.SWITCH,
+ "foo.inc", "0", "0", OLT_DEV_ID, new ChassisId(),
+ DEVICE_ANNOTATIONS);
+
+ @Override
+ public Device getDevice(DeviceId devId) {
+ return device1;
+
+ }
+
+ @Override
+ public Port getPort(ConnectPoint cp) {
+ return new MockPort();
+ }
+
+ @Override
+ public boolean isAvailable(DeviceId d) {
+ return true;
+ }
+ }
+
+ private class MockPort implements Port {
+
+ @Override
+ public boolean isEnabled() {
+ return true;
+ }
+ @Override
+ public long portSpeed() {
+ return 1000;
+ }
+ @Override
+ public Element element() {
+ return null;
+ }
+ @Override
+ public PortNumber number() {
+ return null;
+ }
+ @Override
+ public Annotations annotations() {
+ return new MockAnnotations();
+ }
+ @Override
+ public Type type() {
+ return Port.Type.FIBER;
+ }
+
+ private class MockAnnotations implements Annotations {
+
+ @Override
+ public String value(String val) {
+ return "PON 1/1";
+ }
+ @Override
+ public Set<String> keys() {
+ return null;
+ }
+ }
+ }
+
+ private class MockSadisService implements SadisService {
+ @Override
+ public BaseInformationService<SubscriberAndDeviceInformation> getSubscriberInfoService() {
+ return new MockSubService();
+ }
+
+ @Override
+ public BaseInformationService<BandwidthProfileInformation> getBandwidthProfileService() {
+ return null;
+ }
+ }
+
+ private class MockSubService implements BaseInformationService<SubscriberAndDeviceInformation> {
+ MockSubscriberAndDeviceInformation device =
+ new MockSubscriberAndDeviceInformation(OLT_DEV_ID, VlanId.NONE, VlanId.NONE, null, null,
+ OLT_MAC_ADDRESS, Ip4Address.valueOf("10.10.10.10"));
+ MockSubscriberAndDeviceInformation sub =
+ new MockSubscriberAndDeviceInformation(CLIENT_NAS_PORT_ID, CLIENT_C_TAG,
+ CLIENT_S_TAG, CLIENT_NAS_PORT_ID, CLIENT_CIRCUIT_ID, null, null);
+ @Override
+ public SubscriberAndDeviceInformation get(String id) {
+ if (id.equals(OLT_DEV_ID)) {
+ return device;
+ } else {
+ return sub;
+ }
+ }
+
+ @Override
+ public void invalidateAll() {}
+ @Override
+ public void invalidateId(String id) {}
+ @Override
+ public SubscriberAndDeviceInformation getfromCache(String id) {
+ return null;
+ }
+ }
+
+ private class MockMastershipService extends MastershipServiceAdapter {
+ @Override
+ public boolean isLocalMaster(DeviceId d) {
+ return true;
+ }
+ }
+
+ private class MockSubscriberAndDeviceInformation extends SubscriberAndDeviceInformation {
+
+ MockSubscriberAndDeviceInformation(String id, VlanId ctag,
+ VlanId stag, String nasPortId,
+ String circuitId, MacAddress hardId,
+ Ip4Address ipAddress) {
+ this.setCTag(ctag);
+ this.setHardwareIdentifier(hardId);
+ this.setId(id);
+ this.setIPAddress(ipAddress);
+ this.setSTag(stag);
+ this.setNasPortId(nasPortId);
+ this.setCircuitId(circuitId);
+ }
+ }
+
+ private class MockHostService extends HostServiceAdapter {
+
+ @Override
+ public Set<Host> getHostsByMac(MacAddress mac) {
+
+ HostLocation loc = new HostLocation(DEVICE_ID_1, PortNumber.portNumber(22), 0);
+
+ IpAddress ip = IpAddress.valueOf("10.100.200.10");
+
+ Host h = new DefaultHost(ProviderId.NONE, HostId.hostId(mac, VlanId.NONE),
+ mac, VlanId.NONE, loc, ImmutableSet.of(ip));
+
+ return ImmutableSet.of(h);
+ }
+ }
+
+
+ /**
+ * Mocks the AAAConfig class to force usage of an unroutable address for the
+ * RADIUS server.
+ */
+ static class MockDhcpL2RealyConfig extends DhcpL2RelayConfig {
+ @Override
+ public Set<ConnectPoint> getDhcpServerConnectPoint() {
+ return ImmutableSet.of(SERVER_CONNECT_POINT);
+ }
+
+ @Override
+ public boolean getModifySrcDstMacAddresses() {
+ return true;
+ }
+ }
+
+ /**
+ * Mocks the network config registry.
+ */
+ @SuppressWarnings("unchecked")
+ private static final class TestNetworkConfigRegistry
+ extends NetworkConfigRegistryAdapter {
+ @Override
+ public <S, C extends Config<S>> C getConfig(S subject, Class<C> configClass) {
+ DhcpL2RelayConfig dhcpConfig = new MockDhcpL2RealyConfig();
+ return (C) dhcpConfig;
+ }
+ }
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTestBase.java b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTestBase.java
new file mode 100755
index 0000000..5318adc
--- /dev/null
+++ b/app/src/test/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayTestBase.java
@@ -0,0 +1,311 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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 org.opencord.dhcpl2relay.impl;
+
+import static org.junit.Assert.fail;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.onlab.packet.BasePacket;
+import org.onlab.packet.DHCP;
+import org.onlab.packet.DHCPPacketType;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.IPv4;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.UDP;
+import org.onlab.packet.dhcp.DhcpOption;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreServiceAdapter;
+import org.onosproject.core.DefaultApplicationId;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.packet.DefaultInboundPacket;
+import org.onosproject.net.packet.DefaultPacketContext;
+import org.onosproject.net.packet.InboundPacket;
+import org.onosproject.net.packet.OutboundPacket;
+import org.onosproject.net.packet.PacketContext;
+import org.onosproject.net.packet.PacketProcessor;
+import org.onosproject.net.packet.PacketServiceAdapter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * Common methods for AAA app testing.
+ */
+public class DhcpL2RelayTestBase {
+ private final Logger log = LoggerFactory.getLogger(getClass());
+
+ private static final int TRANSACTION_ID = 1000;
+
+ private static final String EXPECTED_IP = "10.2.0.2";
+
+ List<BasePacket> savedPackets = new LinkedList<>();
+ PacketProcessor packetProcessor;
+
+
+ /**
+ * Saves the given packet onto the saved packets list.
+ *
+ * @param packet packet to save
+ */
+ void savePacket(BasePacket packet) {
+ savedPackets.add(packet);
+ }
+
+ BasePacket getPacket() {
+ return savedPackets.remove(0);
+ }
+
+ /**
+ * Mock core service adaptor that provides an appId.
+ */
+ class MockCoreServiceAdapter extends CoreServiceAdapter {
+
+ @Override
+ public ApplicationId registerApplication(String name) {
+ return new DefaultApplicationId(10, name);
+ }
+ }
+
+ /**
+ * Keeps a reference to the PacketProcessor and saves the OutboundPackets.
+ */
+ class MockPacketService extends PacketServiceAdapter {
+
+ @Override
+ public void addProcessor(PacketProcessor processor, int priority) {
+ packetProcessor = processor;
+ }
+
+ @Override
+ public void emit(OutboundPacket packet) {
+ try {
+ Ethernet eth = Ethernet.deserializer().deserialize(packet.data().array(),
+ 0, packet.data().array().length);
+ savePacket(eth);
+ } catch (Exception e) {
+ fail(e.getMessage());
+ }
+ }
+ }
+
+ /**
+ * Mocks the DefaultPacketContext.
+ */
+ final class TestPacketContext extends DefaultPacketContext {
+
+ private TestPacketContext(long time, InboundPacket inPkt,
+ OutboundPacket outPkt, boolean block) {
+ super(time, inPkt, outPkt, block);
+ }
+
+ @Override
+ public void send() {
+ // We don't send anything out.
+ }
+ }
+
+ /**
+ * Sends an Ethernet packet to the process method of the Packet Processor.
+ *
+ * @param pkt Ethernet packet
+ */
+ void sendPacket(Ethernet pkt, ConnectPoint cp) {
+ final ByteBuffer byteBuffer = ByteBuffer.wrap(pkt.serialize());
+ InboundPacket inPacket = new DefaultInboundPacket(cp, pkt, byteBuffer);
+
+ PacketContext context = new TestPacketContext(127L, inPacket, null, false);
+ packetProcessor.process(context);
+ }
+
+ /**
+ * Constructs an Ethernet packet with IP/UDP/DHCP payload.
+ *
+ * @return Ethernet packet
+ */
+ private Ethernet construcEthernetPacket(MacAddress srcMac, MacAddress dstMac,
+ String dstIp, byte dhcpReqRsp,
+ MacAddress clientHwAddress,
+ Ip4Address dhcpClientIpAddress) {
+ // Ethernet Frame.
+ Ethernet ethPkt = new Ethernet();
+ ethPkt.setSourceMACAddress(srcMac);
+ ethPkt.setDestinationMACAddress(dstMac);
+ ethPkt.setEtherType(Ethernet.TYPE_IPV4);
+ ethPkt.setVlanID((short) 2);
+ ethPkt.setPriorityCode((byte) 6);
+
+ // IP Packet
+ IPv4 ipv4Reply = new IPv4();
+ ipv4Reply.setSourceAddress(0);
+ ipv4Reply.setDestinationAddress(dstIp);
+
+ ipv4Reply.setTtl((byte) 127);
+
+ // UDP Datagram.
+ UDP udpReply = new UDP();
+ udpReply.setSourcePort((byte) UDP.DHCP_CLIENT_PORT);
+ udpReply.setDestinationPort((byte) UDP.DHCP_SERVER_PORT);
+
+ // DHCP Payload.
+ DHCP dhcpReply = new DHCP();
+ dhcpReply.setOpCode(dhcpReqRsp);
+
+ dhcpReply.setYourIPAddress(dhcpClientIpAddress.toInt());
+ dhcpReply.setServerIPAddress(0);
+
+ final byte[] serverNameBytes = new byte[64];
+ String result = new String(serverNameBytes, StandardCharsets.US_ASCII).trim();
+ dhcpReply.setServerName(result);
+
+ final byte[] bootFileBytes = new byte[128];
+ String result1 = new String(bootFileBytes, StandardCharsets.US_ASCII).trim();
+ dhcpReply.setBootFileName(result1);
+
+ dhcpReply.setTransactionId(TRANSACTION_ID);
+ dhcpReply.setClientHardwareAddress(clientHwAddress.toBytes());
+ dhcpReply.setHardwareType(DHCP.HWTYPE_ETHERNET);
+ dhcpReply.setHardwareAddressLength((byte) 6);
+
+ udpReply.setPayload(dhcpReply);
+ ipv4Reply.setPayload(udpReply);
+ ethPkt.setPayload(ipv4Reply);
+
+ return ethPkt;
+ }
+
+ /**
+ * Constructs DHCP Discover Packet.
+ *
+ * @return Ethernet packet
+ */
+ Ethernet constructDhcpDiscoverPacket(MacAddress clientMac) {
+
+ Ethernet pkt = construcEthernetPacket(clientMac, MacAddress.BROADCAST,
+ "255.255.255.255", DHCP.OPCODE_REQUEST, MacAddress.NONE,
+ Ip4Address.valueOf("0.0.0.0"));
+
+ IPv4 ipv4Packet = (IPv4) pkt.getPayload();
+ UDP udpPacket = (UDP) ipv4Packet.getPayload();
+ DHCP dhcpPacket = (DHCP) udpPacket.getPayload();
+
+ dhcpPacket.setOptions(constructDhcpOptions(DHCPPacketType.DHCPDISCOVER));
+
+ return pkt;
+ }
+
+ /**
+ * Constructs DHCP Request Packet.
+ *
+ * @return Ethernet packet
+ */
+ Ethernet constructDhcpRequestPacket(MacAddress clientMac) {
+
+ Ethernet pkt = construcEthernetPacket(clientMac, MacAddress.BROADCAST,
+ "255.255.255.255", DHCP.OPCODE_REQUEST, MacAddress.NONE,
+ Ip4Address.valueOf("0.0.0.0"));
+
+ IPv4 ipv4Packet = (IPv4) pkt.getPayload();
+ UDP udpPacket = (UDP) ipv4Packet.getPayload();
+ DHCP dhcpPacket = (DHCP) udpPacket.getPayload();
+
+ dhcpPacket.setOptions(constructDhcpOptions(DHCPPacketType.DHCPREQUEST));
+
+ return pkt;
+ }
+
+ /**
+ * Constructs DHCP Offer Packet.
+ *
+ * @return Ethernet packet
+ */
+ Ethernet constructDhcpOfferPacket(MacAddress servMac, MacAddress clientMac,
+ String ipAddress, String dhcpClientIpAddress) {
+
+ Ethernet pkt = construcEthernetPacket(servMac, clientMac, ipAddress, DHCP.OPCODE_REPLY,
+ clientMac, Ip4Address.valueOf(dhcpClientIpAddress));
+
+ IPv4 ipv4Packet = (IPv4) pkt.getPayload();
+ UDP udpPacket = (UDP) ipv4Packet.getPayload();
+ DHCP dhcpPacket = (DHCP) udpPacket.getPayload();
+
+ dhcpPacket.setOptions(constructDhcpOptions(DHCPPacketType.DHCPOFFER));
+
+ return pkt;
+ }
+
+ /**
+ * Constructs DHCP Ack Packet.
+ *
+ * @return Ethernet packet
+ */
+ Ethernet constructDhcpAckPacket(MacAddress servMac, MacAddress clientMac,
+ String ipAddress, String dhcpClientIpAddress) {
+
+ Ethernet pkt = construcEthernetPacket(servMac, clientMac, ipAddress, DHCP.OPCODE_REPLY,
+ clientMac, Ip4Address.valueOf(dhcpClientIpAddress));
+
+ IPv4 ipv4Packet = (IPv4) pkt.getPayload();
+ UDP udpPacket = (UDP) ipv4Packet.getPayload();
+ DHCP dhcpPacket = (DHCP) udpPacket.getPayload();
+
+ dhcpPacket.setOptions(constructDhcpOptions(DHCPPacketType.DHCPACK));
+
+ return pkt;
+ }
+
+ /**
+ * Constructs DHCP Discover Options.
+ *
+ * @return Ethernet packet
+ */
+ private List<DhcpOption> constructDhcpOptions(DHCPPacketType packetType) {
+
+ // DHCP Options.
+ DhcpOption option = new DhcpOption();
+ List<DhcpOption> optionList = new ArrayList<>();
+
+
+ // DHCP Message Type.
+ option.setCode(DHCP.DHCPOptionCode.OptionCode_MessageType.getValue());
+ option.setLength((byte) 1);
+ byte[] optionData = {(byte) packetType.getValue()};
+ option.setData(optionData);
+ optionList.add(option);
+
+ // DHCP Requested IP.
+ option = new DhcpOption();
+ option.setCode(DHCP.DHCPOptionCode.OptionCode_RequestedIP.getValue());
+ option.setLength((byte) 4);
+ optionData = Ip4Address.valueOf(EXPECTED_IP).toOctets();
+ option.setData(optionData);
+ optionList.add(option);
+
+ // End Option.
+ option = new DhcpOption();
+ option.setCode(DHCP.DHCPOptionCode.OptionCode_END.getValue());
+ option.setLength((byte) 1);
+ optionList.add(option);
+
+ return optionList;
+ }
+}