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/*
*
* * Copyright 2015 AT&T Foundry
* *
* * 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.onlab.packet;
import java.nio.ByteBuffer;
import static org.onlab.packet.PacketUtils.checkHeaderLength;
import static org.onlab.packet.PacketUtils.checkInput;
/**
* EAP (Extensible Authentication Protocol) packet.
*/
public class EAP extends BasePacket {
private static final int HEADER_LENGTH = 4;
public static final short MIN_LEN = 0x4;
public static final short EAP_HDR_LEN_REQ_RESP = 5;
public static final short EAP_HDR_LEN_SUC_FAIL = 4;
// EAP Code
public static final byte REQUEST = 0x1;
public static final byte RESPONSE = 0x2;
public static final byte SUCCESS = 0x3;
public static final byte FAILURE = 0x4;
// EAP Attribute Type
public static final byte ATTR_IDENTITY = 0x1;
public static final byte ATTR_NOTIFICATION = 0x2;
public static final byte ATTR_NAK = 0x3;
public static final byte ATTR_MD5 = 0x4;
public static final byte ATTR_OTP = 0x5;
public static final byte ATTR_GTC = 0x6;
public static final byte ATTR_TLS = 0xd;
protected byte code;
protected byte identifier;
protected short length;
protected byte type;
protected byte[] data;
/**
* Gets the EAP code.
*
* @return EAP code
*/
public byte getCode() {
return this.code;
}
/**
* Sets the EAP code.
*
* @param code EAP code
* @return this
*/
public EAP setCode(final byte code) {
this.code = code;
return this;
}
/**
* Gets the EAP identifier.
*
* @return EAP identifier
*/
public byte getIdentifier() {
return this.identifier;
}
/**
* Sets the EAP identifier.
*
* @param identifier EAP identifier
* @return this
*/
public EAP setIdentifier(final byte identifier) {
this.identifier = identifier;
return this;
}
/**
* Gets the get packet length.
*
* @return packet length
*/
public short getLength() {
return this.length;
}
/**
* Sets the packet length.
*
* @param length packet length
* @return this
*/
public EAP setLength(final short length) {
this.length = length;
return this;
}
/**
* Gets the data type.
*
* @return data type
*/
public byte getDataType() {
return this.type;
}
/**
* Sets the data type.
*
* @param type data type
* @return this
*/
public EAP setDataType(final byte type) {
this.type = type;
return this;
}
/**
* Gets the EAP data.
*
* @return EAP data
*/
public byte[] getData() {
return this.data;
}
/**
* Sets the EAP data.
*
* @param data EAP data to be set
* @return this
*/
public EAP setData(final byte[] data) {
this.data = data;
return this;
}
/**
* Default EAP constructor that sets the EAP code to 0.
*/
public EAP() {
this.code = 0;
}
/**
* EAP constructor that initially sets all fields.
*
* @param code EAP code
* @param identifier EAP identifier
* @param type packet type
* @param data EAP data
*/
public EAP(byte code, byte identifier, byte type, byte[] data) {
this.code = code;
this.identifier = identifier;
if (this.code == REQUEST || this.code == RESPONSE) {
this.length = (short) (5 + (data == null ? 0 : data.length));
this.type = type;
} else {
this.length = (short) (4 + (data == null ? 0 : data.length));
}
this.data = data;
}
/**
* Deserializer for EAP packets.
*
* @return deserializer
*/
public static Deserializer<EAP> deserializer() {
return (data, offset, length) -> {
checkInput(data, offset, length, HEADER_LENGTH);
EAP eap = new EAP();
final ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
eap.code = bb.get();
eap.identifier = bb.get();
eap.length = bb.getShort();
checkHeaderLength(length, eap.length);
int dataLength;
if (eap.code == REQUEST || eap.code == RESPONSE) {
eap.type = bb.get();
dataLength = eap.length - 5;
} else {
dataLength = eap.length - 4;
}
eap.data = new byte[dataLength];
bb.get(eap.data);
return eap;
};
}
@Override
public byte[] serialize() {
final byte[] data = new byte[this.length];
final ByteBuffer bb = ByteBuffer.wrap(data);
bb.put(this.code);
bb.put(this.identifier);
bb.putShort(this.length);
if (this.code == REQUEST || this.code == RESPONSE) {
bb.put(this.type);
}
if (this.data != null) {
bb.put(this.data);
}
return data;
}
@Override
public IPacket deserialize(final byte[] data, final int offset,
final int length) {
final ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
this.code = bb.get();
this.identifier = bb.get();
this.length = bb.getShort();
int dataLength;
if (this.code == REQUEST || this.code == RESPONSE) {
this.type = bb.get();
dataLength = this.length - 5;
} else {
dataLength = this.length - 4;
}
this.data = new byte[dataLength];
bb.get(this.data);
return this;
}
@Override
public int hashCode() {
final int prime = 3889;
int result = super.hashCode();
result = prime * result + this.code;
result = prime * result + this.identifier;
result = prime * result + this.length;
result = prime * result + this.type;
return result;
}
}
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