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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.protocol.linkstate;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Objects;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.bgpio.exceptions.BGPParseException;
import org.onosproject.bgpio.types.BGPErrorType;
import org.onosproject.bgpio.types.BGPValueType;
import org.onosproject.bgpio.types.IPReachabilityInformationTlv;
import org.onosproject.bgpio.types.OSPFRouteTypeTlv;
import org.onosproject.bgpio.types.attr.BgpAttrNodeMultiTopologyId;
import org.onosproject.bgpio.util.UnSupportedAttribute;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides Implementation of Local node descriptors and prefix descriptors.
*/
public class BGPPrefixLSIdentifier {
protected static final Logger log = LoggerFactory.getLogger(BGPPrefixLSIdentifier.class);
public static final int TYPE_AND_LEN = 4;
private NodeDescriptors localNodeDescriptors;
private LinkedList<BGPValueType> prefixDescriptor;
/**
* Resets parameters.
*/
public BGPPrefixLSIdentifier() {
this.localNodeDescriptors = null;
this.prefixDescriptor = null;
}
/**
* Constructor to initialize parameters.
*
* @param localNodeDescriptors Local node descriptors
* @param prefixDescriptor Prefix Descriptors
*/
public BGPPrefixLSIdentifier(NodeDescriptors localNodeDescriptors, LinkedList<BGPValueType> prefixDescriptor) {
this.localNodeDescriptors = localNodeDescriptors;
this.prefixDescriptor = prefixDescriptor;
}
/**
* Reads the channel buffer and parses Prefix Identifier.
*
* @param cb ChannelBuffer
* @param protocolId protocol ID
* @return object of this class
* @throws BGPParseException while parsing Prefix Identifier
*/
public static BGPPrefixLSIdentifier parsePrefixIdendifier(ChannelBuffer cb, byte protocolId)
throws BGPParseException {
//Parse Local Node descriptor
NodeDescriptors localNodeDescriptors = new NodeDescriptors();
localNodeDescriptors = parseLocalNodeDescriptors(cb, protocolId);
//Parse Prefix descriptor
LinkedList<BGPValueType> prefixDescriptor = new LinkedList<>();
prefixDescriptor = parsePrefixDescriptors(cb);
return new BGPPrefixLSIdentifier(localNodeDescriptors, prefixDescriptor);
}
/**
* Parse local node descriptors.
*
* @param cb ChannelBuffer
* @param protocolId protocol identifier
* @return LocalNodeDescriptors
* @throws BGPParseException while parsing local node descriptors
*/
public static NodeDescriptors parseLocalNodeDescriptors(ChannelBuffer cb, byte protocolId)
throws BGPParseException {
ChannelBuffer tempBuf = cb;
short type = cb.readShort();
short length = cb.readShort();
if (cb.readableBytes() < length) {
//length + 4 implies data contains type, length and value
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR,
tempBuf.readBytes(cb.readableBytes() + TYPE_AND_LEN));
}
NodeDescriptors localNodeDescriptors = new NodeDescriptors();
ChannelBuffer tempCb = cb.readBytes(length);
if (type == NodeDescriptors.LOCAL_NODE_DES_TYPE) {
localNodeDescriptors = NodeDescriptors.read(tempCb, length, type, protocolId);
} else {
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR,
BGPErrorType.MALFORMED_ATTRIBUTE_LIST, null);
}
return localNodeDescriptors;
}
/**
* Parse list of prefix descriptors.
*
* @param cb ChannelBuffer
* @return list of prefix descriptors
* @throws BGPParseException while parsing list of prefix descriptors
*/
public static LinkedList<BGPValueType> parsePrefixDescriptors(ChannelBuffer cb) throws BGPParseException {
LinkedList<BGPValueType> prefixDescriptor = new LinkedList<>();
BGPValueType tlv = null;
boolean isIpReachInfo = false;
ChannelBuffer tempCb;
int count = 0;
while (cb.readableBytes() > 0) {
ChannelBuffer tempBuf = cb;
short type = cb.readShort();
short length = cb.readShort();
if (cb.readableBytes() < length) {
//length + 4 implies data contains type, length and value
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR,
tempBuf.readBytes(cb.readableBytes() + TYPE_AND_LEN));
}
tempCb = cb.readBytes(length);
switch (type) {
case OSPFRouteTypeTlv.TYPE:
tlv = OSPFRouteTypeTlv.read(tempCb);
break;
case IPReachabilityInformationTlv.TYPE:
tlv = IPReachabilityInformationTlv.read(tempCb, length);
isIpReachInfo = true;
break;
case BgpAttrNodeMultiTopologyId.ATTRNODE_MULTITOPOLOGY:
tlv = BgpAttrNodeMultiTopologyId.read(tempCb);
count = count + 1;
if (count > 1) {
//length + 4 implies data contains type, length and value
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR,
BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR, tempBuf.readBytes(length + TYPE_AND_LEN));
}
break;
default:
UnSupportedAttribute.skipBytes(tempCb, length);
}
prefixDescriptor.add(tlv);
}
if (!isIpReachInfo) {
throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.OPTIONAL_ATTRIBUTE_ERROR,
null);
}
return prefixDescriptor;
}
/**
* Returns local node descriptors.
*
* @return local node descriptors
*/
public NodeDescriptors getLocalNodeDescriptors() {
return this.localNodeDescriptors;
}
/**
* Returns Prefix descriptors.
*
* @return Prefix descriptors
*/
public LinkedList<BGPValueType> getPrefixdescriptor() {
return this.prefixDescriptor;
}
@Override
public int hashCode() {
return Objects.hash(prefixDescriptor.hashCode(), localNodeDescriptors);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof BGPPrefixLSIdentifier) {
int countObjSubTlv = 0;
int countOtherSubTlv = 0;
boolean isCommonSubTlv = true;
BGPPrefixLSIdentifier other = (BGPPrefixLSIdentifier) obj;
Iterator<BGPValueType> objListIterator = other.prefixDescriptor.iterator();
countOtherSubTlv = other.prefixDescriptor.size();
countObjSubTlv = prefixDescriptor.size();
if (countObjSubTlv != countOtherSubTlv) {
return false;
} else {
while (objListIterator.hasNext() && isCommonSubTlv) {
BGPValueType subTlv = objListIterator.next();
isCommonSubTlv = Objects.equals(prefixDescriptor.contains(subTlv),
other.prefixDescriptor.contains(subTlv));
}
return isCommonSubTlv && Objects.equals(this.localNodeDescriptors, other.localNodeDescriptors);
}
}
return false;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("localNodeDescriptors", localNodeDescriptors)
.add("prefixDescriptor", prefixDescriptor)
.toString();
}
}
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