| /* |
| * Copyright 2015-present 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 com.google.common.base.MoreObjects; |
| 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 java.util.ArrayList; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * 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; |
| public static final byte FLAGS = (byte) 0x40; |
| |
| 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) { |
| |
| int iLenStartIndex = cb.writerIndex(); |
| |
| cb.writeByte(FLAGS); |
| cb.writeByte(getType()); |
| if ((as4pathSet != null) && (as4pathSeq != null)) { |
| int iAsLenIndex = cb.writerIndex(); |
| cb.writeByte(0); |
| cb.writeByte(AsPath.ASPATH_SEQ_TYPE); |
| cb.writeByte(as4pathSeq.size()); |
| |
| for (int j = 0; j < as4pathSeq.size(); j++) { |
| cb.writeInt(as4pathSeq.get(j)); |
| } |
| |
| int asLen = cb.writerIndex() - iAsLenIndex; |
| cb.setByte(iAsLenIndex, (byte) (asLen - 1)); |
| } else { |
| cb.writeByte(0); |
| } |
| return cb.writerIndex() - iLenStartIndex; |
| } |
| |
| @Override |
| public int compareTo(Object o) { |
| // TODO Auto-generated method stub |
| return 0; |
| } |
| } |