| /* |
| * 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.DeserializationException; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| |
| /** |
| * Implements IPCP Type-Length-Value options. |
| */ |
| public class PppTlv { |
| public static final byte IPCPTLV_IP_ADDRESS = 0x03; |
| private byte type; |
| private byte length; // Including the 2 byte of Minimum header |
| private byte[] value; |
| |
| /** |
| * Get the TLV type. |
| * |
| * @return the TLV type |
| */ |
| public byte getType() { |
| return type; |
| } |
| |
| /** |
| * Set the TLV type. |
| * |
| * @param type the TLV type to set |
| * @return this |
| */ |
| public PppTlv setType(byte type) { |
| this.type = type; |
| return this; |
| } |
| |
| /** |
| * Get the TLV length. The length include the 2 bytes of minimum header |
| * length. |
| * |
| * @return the TLV length |
| */ |
| public byte getLength() { |
| return length; |
| } |
| |
| /** |
| * Set the TLV length. Length must include the 2 bytes of minimum header |
| * length. |
| * |
| * @param length the TLV length to set. |
| * @return this |
| */ |
| public PppTlv setLength(byte length) { |
| this.length = length; |
| return this; |
| } |
| |
| /** |
| * Get the TLV value field as byte array. |
| * |
| * @return the TLV value field |
| */ |
| public byte[] getValue() { |
| return value; |
| } |
| |
| /** |
| * Set the TLV valued field. |
| * |
| * @param value the TLV value to set |
| * @return this |
| */ |
| public PppTlv setValue(byte[] value) { |
| this.value = value; |
| return this; |
| } |
| |
| public byte[] serialize() { |
| final byte[] data = new byte[this.length]; |
| final ByteBuffer bb = ByteBuffer.wrap(data); |
| bb.put(type); |
| bb.put(length); |
| if (this.value != null) { |
| bb.put(this.value); |
| } |
| return data; |
| } |
| |
| public PppTlv deserialize(final ByteBuffer bb) throws DeserializationException { |
| if (bb.remaining() < 2) { |
| throw new DeserializationException( |
| "Not enough bytes to deserialize PPP TLV options"); |
| } |
| this.type = bb.get(); |
| this.length = bb.get(); |
| if (this.length > 2) { |
| this.value = new byte[this.length - 2]; |
| |
| // if there is an underrun just toss the TLV |
| // Length include the length of the TLV header itself |
| if (bb.remaining() < this.length - 2) { |
| throw new DeserializationException( |
| "Remaining bytes are less then the length of the PPP TLV tag"); |
| } |
| bb.get(this.value); |
| return this; |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("["); |
| sb.append("type= "); |
| sb.append(this.type); |
| sb.append("length= "); |
| sb.append(this.length); |
| sb.append("value= "); |
| sb.append(Arrays.toString(this.value)); |
| sb.append("]"); |
| return sb.toString(); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.lang.Object#equals(java.lang.Object) |
| */ |
| @Override |
| public boolean equals(final Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (!(obj instanceof PppTlv)) { |
| return false; |
| } |
| final PppTlv other = (PppTlv) obj; |
| if (this.length != other.length) { |
| return false; |
| } |
| if (this.type != other.type) { |
| return false; |
| } |
| if (!Arrays.equals(this.value, other.value)) { |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(type, length, Arrays.hashCode(value)); |
| } |
| } |