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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.ver4;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.bgpio.exceptions.BGPParseException;
import org.onosproject.bgpio.protocol.BGPKeepaliveMsg;
import org.onosproject.bgpio.protocol.BGPMessageReader;
import org.onosproject.bgpio.protocol.BGPMessageWriter;
import org.onosproject.bgpio.types.BGPHeader;
import org.onosproject.bgpio.protocol.BGPType;
import org.onosproject.bgpio.protocol.BGPVersion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides BGP keep alive message.
*/
class BGPKeepaliveMsgVer4 implements BGPKeepaliveMsg {
/*
<Keepalive Message>::= <Common Header>
A KEEPALIVE message consists of only the message header and has a
length of 19 octets.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ +
| Marker |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Length | Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
REFERENCE : RFC 4271
*/
protected static final Logger log = LoggerFactory
.getLogger(BGPKeepaliveMsgVer4.class);
private BGPHeader bgpMsgHeader;
public static final byte PACKET_VERSION = 4;
public static final int PACKET_MINIMUM_LENGTH = 19;
public static final int MARKER_LENGTH = 16;
public static final BGPType MSG_TYPE = BGPType.KEEP_ALIVE;
public static byte[] marker = new byte[] {(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff};
public static final BGPKeepaliveMsgVer4.Reader READER = new Reader();
/**
* Reader class for reading BGP keepalive message from channel buffer.
*/
static class Reader implements BGPMessageReader<BGPKeepaliveMsg> {
@Override
public BGPKeepaliveMsg readFrom(ChannelBuffer cb, BGPHeader bgpHeader)
throws BGPParseException {
/* bgpHeader is not required in case of keepalive message and
Header is already read and no other fields except header in keepalive message.*/
return new BGPKeepaliveMsgVer4();
}
}
/**
* Default constructor.
*/
BGPKeepaliveMsgVer4() {
}
/**
* Builder class for BGP keepalive message.
*/
static class Builder implements BGPKeepaliveMsg.Builder {
BGPHeader bgpMsgHeader;
@Override
public Builder setHeader(BGPHeader bgpMsgHeader) {
this.bgpMsgHeader = bgpMsgHeader;
return this;
}
@Override
public BGPKeepaliveMsg build() {
return new BGPKeepaliveMsgVer4();
}
}
@Override
public void writeTo(ChannelBuffer cb) {
WRITER.write(cb, this);
}
static final Writer WRITER = new Writer();
/**
* Writer class for writing the BGP keepalive message to channel buffer.
*/
static class Writer implements BGPMessageWriter<BGPKeepaliveMsgVer4> {
@Override
public void write(ChannelBuffer cb, BGPKeepaliveMsgVer4 message) {
// write marker
cb.writeBytes(marker, 0, MARKER_LENGTH);
// write length of header
cb.writeShort(PACKET_MINIMUM_LENGTH);
// write the type of message
cb.writeByte(MSG_TYPE.getType());
}
}
@Override
public BGPVersion getVersion() {
return BGPVersion.BGP_4;
}
@Override
public BGPType getType() {
return MSG_TYPE;
}
@Override
public BGPHeader getHeader() {
return this.bgpMsgHeader;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass()).toString();
}
}
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