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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onosproject.bgpio.types;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.bgpio.exceptions.BgpParseException;
import org.onosproject.bgpio.util.Constants;
import org.onosproject.bgpio.util.Validation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides Implementation of AsPath mandatory BGP Path Attribute.
*/
public class AsPath implements BgpValueType {
/**
* Enum to provide AS types.
*/
public enum ASTYPE {
AS_SET(1), AS_SEQUENCE(2), AS_CONFED_SEQUENCE(3), AS_CONFED_SET(4);
int value;
/**
* Assign val with the value as the AS type.
*
* @param val AS type
*/
ASTYPE(int val) {
value = val;
}
/**
* Returns value of AS type.
*
* @return AS type
*/
public byte type() {
return (byte) value;
}
}
private static final Logger log = LoggerFactory.getLogger(AsPath.class);
public static final byte ASPATH_TYPE = 2;
public static final byte ASPATH_SET_TYPE = 1;
public static final byte ASPATH_SEQ_TYPE = 2;
public static final byte ASNUM_SIZE = 2;
private boolean isAsPath = false;
private List<Short> aspathSet;
private List<Short> aspathSeq;
/**
* Initialize Fields.
*/
public AsPath() {
this.aspathSeq = null;
this.aspathSet = null;
}
/**
* Constructor to initialize parameters.
*
* @param aspathSet ASpath Set type
* @param aspathSeq ASpath Sequence type
*/
public AsPath(List<Short> aspathSet, List<Short> aspathSeq) {
this.aspathSeq = aspathSeq;
this.aspathSet = aspathSet;
this.isAsPath = true;
}
/**
* Reads from the channel buffer and parses AsPath.
*
* @param cb ChannelBuffer
* @return object of AsPath
* @throws BgpParseException while parsing AsPath
*/
public static AsPath read(ChannelBuffer cb) throws BgpParseException {
List<Short> aspathSet = new ArrayList<>();
List<Short> aspathSeq = new ArrayList<>();
ChannelBuffer tempCb = cb.copy();
Validation validation = Validation.parseAttributeHeader(cb);
if (cb.readableBytes() < validation.getLength()) {
Validation.validateLen(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_LENGTH_ERROR,
validation.getLength());
}
//if fourth bit is set, length is read as short otherwise as byte , len includes type, length and value
int len = validation.isShort() ? validation.getLength() + Constants.TYPE_AND_LEN_AS_SHORT : validation
.getLength() + Constants.TYPE_AND_LEN_AS_BYTE;
ChannelBuffer data = tempCb.readBytes(len);
if (validation.getFirstBit() && !validation.getSecondBit() && validation.getThirdBit()) {
throw new BgpParseException(BgpErrorType.UPDATE_MESSAGE_ERROR, BgpErrorType.ATTRIBUTE_FLAGS_ERROR, data);
}
ChannelBuffer tempBuf = cb.readBytes(validation.getLength());
while (tempBuf.readableBytes() > 0) {
byte pathSegType = tempBuf.readByte();
//no of ASes
byte pathSegLen = tempBuf.readByte();
int length = pathSegLen * ASNUM_SIZE;
if (tempBuf.readableBytes() < length) {
Validation.validateLen(BgpErrorType.UPDATE_MESSAGE_ERROR,
BgpErrorType.ATTRIBUTE_LENGTH_ERROR, length);
}
ChannelBuffer aspathBuf = tempBuf.readBytes(length);
while (aspathBuf.readableBytes() > 0) {
short asNum;
asNum = aspathBuf.readShort();
switch (pathSegType) {
case ASPATH_SET_TYPE:
aspathSet.add(asNum);
break;
case ASPATH_SEQ_TYPE:
aspathSeq.add(asNum);
break;
default: log.debug("Other type Not Supported:" + pathSegType);
}
}
}
return new AsPath(aspathSet, aspathSeq);
}
@Override
public short getType() {
return ASPATH_TYPE;
}
/**
* Returns whether ASpath path attribute is present.
*
* @return whether ASpath path attribute is present
*/
public boolean isaspathSet() {
return this.isAsPath;
}
/**
* Returns list of ASNum in ASpath Sequence.
*
* @return list of ASNum in ASpath Sequence
*/
public List<Short> asPathSeq() {
return this.aspathSeq;
}
/**
* Returns list of ASNum in ASpath SET.
*
* @return list of ASNum in ASpath SET
*/
public List<Short> asPathSet() {
return this.aspathSet;
}
@Override
public int hashCode() {
return Objects.hash(aspathSet, aspathSeq);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof AsPath) {
AsPath other = (AsPath) obj;
return Objects.equals(aspathSet, other.aspathSet) && Objects.equals(aspathSeq, other.aspathSeq);
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.omitNullValues()
.add("aspathSet", aspathSet)
.add("aspathSeq", aspathSeq)
.toString();
}
@Override
public int write(ChannelBuffer cb) {
//Not required to Implement as of now
return 0;
}
@Override
public int compareTo(Object o) {
// TODO Auto-generated method stub
return 0;
}
}
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