| /* |
| * Copyright 2019-2023 Open Networking Foundation (ONF) and the ONF Contributors |
| * |
| * 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.bng.packets; |
| |
| import com.google.common.base.Objects; |
| import org.onlab.packet.Data; |
| import org.onlab.packet.Deserializer; |
| |
| import java.nio.ByteBuffer; |
| |
| import static org.onlab.packet.PacketUtils.checkInput; |
| |
| /** |
| * Implements the Link Control Protocol (LCP) header. |
| */ |
| |
| public class GenericPpp extends Ppp { |
| |
| // TODO: Add support for TLV options. |
| |
| public static final byte CHAP_CODE_CHALLENGE = 0x01; |
| public static final byte CHAP_CODE_RESPONSE = 0x02; |
| public static final byte CHAP_CODE_SUCCESS = 0x03; |
| public static final byte CHAP_CODE_FAILURE = 0x04; |
| |
| public static final byte PAP_AUTH_REQ = 0x01; |
| public static final byte PAP_AUTH_ACK = 0x02; |
| public static final byte PAP_AUTH_NACK = 0x03; |
| |
| public static final byte CODE_TERM_REQ = 0x05; |
| public static final byte CODE_TERM_ACK = 0x06; |
| |
| |
| /** |
| * Deserializer function for LCP packets. |
| * |
| * @return deserializer function |
| */ |
| public static Deserializer<GenericPpp> deserializer() { |
| return (data, offset, length) -> { |
| checkInput(data, offset, length, MIN_HEADER_LENGTH); |
| GenericPpp ppp = new GenericPpp(); |
| final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| ppp.code = bb.get(); |
| ppp.identifier = bb.get(); |
| ppp.length = bb.getShort(); |
| if (ppp.length > MIN_HEADER_LENGTH) { |
| ppp.payload = Data.deserializer() |
| .deserialize(data, bb.position(), |
| Math.min(bb.limit() - bb.position(), |
| ppp.length - MIN_HEADER_LENGTH)); |
| ppp.payload.setParent(ppp); |
| } |
| return ppp; |
| }; |
| } |
| |
| @Override |
| public byte[] serialize() { |
| byte[] payloadData = null; |
| int payloadLength = 0; |
| if (this.payload != null) { |
| this.payload.setParent(this); |
| payloadData = this.payload.serialize(); |
| payloadLength = payloadData.length + MIN_HEADER_LENGTH; |
| } |
| int realLength = this.length > payloadLength ? this.length : payloadLength; |
| final byte[] data = new byte[realLength]; |
| final ByteBuffer bb = ByteBuffer.wrap(data); |
| bb.put(this.code); |
| bb.put(this.identifier); |
| bb.putShort(this.length); |
| if (payloadData != null) { |
| bb.put(payloadData); |
| } |
| return data; |
| } |
| |
| @Override |
| public int hashCode() { |
| return 31 * super.hashCode() + Objects.hashCode(code, identifier, length); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null || getClass() != obj.getClass()) { |
| return false; |
| } |
| if (!super.equals(obj)) { |
| return false; |
| } |
| final GenericPpp other = (GenericPpp) obj; |
| return Objects.equal(this.code, other.code) |
| && Objects.equal(this.identifier, other.identifier) |
| && Objects.equal(this.length, other.length); |
| } |
| } |
| |