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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 As4Path BGP Path Attribute.
*/
public class As4Path implements BgpValueType {
private static final Logger log = LoggerFactory.getLogger(AsPath.class);
public static final byte AS4PATH_TYPE = 17;
public static final byte ASNUM_SIZE = 4;
private List<Integer> as4pathSet;
private List<Integer> as4pathSeq;
/**
* Initialize fields.
*/
public As4Path() {
this.as4pathSeq = null;
this.as4pathSet = null;
}
/**
* Constructor to initialize parameters.
*
* @param as4pathSet AS4path Set
* @param as4pathSeq AS4path Sequence
*/
public As4Path(List<Integer> as4pathSet, List<Integer> as4pathSeq) {
this.as4pathSeq = as4pathSeq;
this.as4pathSet = as4pathSet;
}
/**
* Reads from the channel buffer and parses As4Path.
*
* @param cb ChannelBuffer
* @return object of As4Path
* @throws BgpParseException while parsing As4Path
*/
public static As4Path read(ChannelBuffer cb) throws BgpParseException {
List<Integer> as4pathSet = new ArrayList<>();
List<Integer> as4pathSeq = 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();
//length = no of Ases * ASnum size (4 bytes)
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) {
int asNum;
asNum = aspathBuf.readInt();
switch (pathSegType) {
case AsPath.ASPATH_SET_TYPE:
as4pathSet.add(asNum);
break;
case AsPath.ASPATH_SEQ_TYPE:
as4pathSeq.add(asNum);
break;
default: log.debug("Other type Not Supported:" + pathSegType);
}
}
}
return new As4Path(as4pathSet, as4pathSeq);
}
@Override
public short getType() {
return AS4PATH_TYPE;
}
/**
* Returns list of ASNum in AS4path Sequence.
*
* @return list of ASNum in AS4path Sequence
*/
public List<Integer> as4PathSEQ() {
return this.as4pathSeq;
}
/**
* Returns list of ASNum in AS4path Set.
*
* @return list of ASNum in AS4path Set
*/
public List<Integer> as4PathSET() {
return this.as4pathSet;
}
@Override
public int hashCode() {
return Objects.hash(as4pathSet, as4pathSeq);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof As4Path) {
As4Path other = (As4Path) obj;
return Objects.equals(as4pathSet, other.as4pathSet) && Objects.equals(as4pathSeq, other.as4pathSeq);
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.omitNullValues()
.add("as4pathSet", as4pathSet)
.add("as4pathSeq", as4pathSeq)
.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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