| /* |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * 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.ospf.controller.impl; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.channel.Channel; |
| import org.jboss.netty.channel.ChannelHandlerContext; |
| import org.jboss.netty.handler.codec.frame.FrameDecoder; |
| import org.onlab.packet.Ip4Address; |
| import org.onosproject.ospf.controller.OspfMessage; |
| import org.onosproject.ospf.exceptions.OspfParseException; |
| import org.onosproject.ospf.protocol.ospfpacket.OspfMessageReader; |
| import org.onosproject.ospf.protocol.util.OspfUtil; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| /** |
| * Decodes an OSPF message from a Channel, for use in a netty pipeline. |
| */ |
| public class OspfMessageDecoder extends FrameDecoder { |
| |
| private static final Logger log = LoggerFactory.getLogger(OspfMessageDecoder.class); |
| |
| @Override |
| protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) |
| throws OspfParseException { |
| log.debug("OspfMessageDecoder::Message received <:> length {}", buffer.readableBytes()); |
| if (!channel.isConnected()) { |
| log.info("Channel is not connected."); |
| return null; |
| } |
| OspfMessageReader messageReader = new OspfMessageReader(); |
| List<OspfMessage> ospfMessageList = new LinkedList<>(); |
| while (buffer.readableBytes() >= OspfUtil.MINIMUM_FRAME_LEN) { |
| ChannelBuffer ospfDataBuffer = buffer.readBytes(OspfUtil.MINIMUM_FRAME_LEN); |
| int readableBytes = ospfDataBuffer.readableBytes(); |
| OspfMessage message = messageReader.readFromBuffer(ospfDataBuffer); |
| if (message != null) { |
| if (ospfDataBuffer.readableBytes() >= OspfUtil.METADATA_LEN) { |
| ospfDataBuffer.readerIndex(readableBytes - OspfUtil.METADATA_LEN); |
| log.debug("IsisMessageDecoder::Reading metadata <:> length {}", ospfDataBuffer.readableBytes()); |
| |
| |
| int interfaceIndex = ospfDataBuffer.readByte(); |
| byte[] sourceIpBytes = new byte[OspfUtil.FOUR_BYTES]; |
| ospfDataBuffer.readBytes(sourceIpBytes, 0, OspfUtil.FOUR_BYTES); |
| Ip4Address sourceIP = Ip4Address.valueOf(sourceIpBytes); |
| |
| message.setSourceIp(sourceIP); |
| message.setInterfaceIndex(interfaceIndex); |
| } |
| ospfMessageList.add(message); |
| } |
| } |
| return (!ospfMessageList.isEmpty()) ? ospfMessageList : null; |
| } |
| } |