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/*
* Copyright 2017-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.onlab.packet;
import org.slf4j.Logger;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import static com.google.common.base.MoreObjects.toStringHelper;
import static org.onlab.packet.PacketUtils.checkInput;
import static org.slf4j.LoggerFactory.getLogger;
/**
* Implements RIP Packet format, according to RFC 2453.
*/
public class RIP extends BasePacket {
/**
* Routing Information Protocol packet.
* ------------------------------------------ |cmdType (1) | version(1) |
* ------------------------------------------ |reserved (2) |
* ------------------------------------------ | route entries (n*20) |
* ------------------------------------------
*
*/
// the case of no RIP entry
public static final int MIN_HEADER_LENGTH = 4;
private final Logger log = getLogger(getClass());
public enum CmdType {
RIPREQUEST(1),
RIPRESPONSE(2);
protected int value;
CmdType(final int value) {
this.value = value;
}
public int getValue() {
return this.value;
}
public static CmdType getType(final int value) {
switch (value) {
case 1:
return RIPREQUEST;
case 2:
return RIPRESPONSE;
default:
return null;
}
}
}
protected byte cmdType;
protected byte version;
protected short reserved;
protected List rtEntries = new ArrayList();
protected RIPV2AuthEntry authEntry = null;
protected byte[] rawData = null;
/**
* @return the cmdType
*/
public byte getCmdType() {
return this.cmdType;
}
/**
* @param cmdType
* the cmdType to set
* @return this
*/
public RIP setCmdType(final byte cmdType) {
this.cmdType = cmdType;
return this;
}
/**
* @return the version
*/
public byte getVersion() {
return this.version;
}
/**
* @param version
* the version to set
* @return this
*/
public RIP setVersion(final byte version) {
this.version = version;
return this;
}
/**
* @return the reserved short
*/
public short getReserved() {
return this.reserved;
}
/**
* @param reserved
* the reserved short to set
* @return this
*/
public RIP setReserved(final short reserved) {
this.reserved = reserved;
return this;
}
/**
* @return the route entries
*/
public List getRtEntries() {
return this.rtEntries;
}
/**
* @param entries
* the route entries to set
* @return this
*/
public RIP setRtEntries(final List entries) {
this.rtEntries = entries;
return this;
}
/**
* @return the authentication entry
*/
public RIPV2AuthEntry getAuthEntry() {
return this.authEntry;
}
/**
* @return the raw data of whole RIP packet (after RIP header)
*/
public byte[] getRawData() {
return this.rawData;
}
@Override
public byte[] serialize() {
// not guaranteed to retain length/exact format
this.resetChecksum();
int dataLength = MIN_HEADER_LENGTH + RIPV2Entry.ENTRY_LEN * rtEntries.size();
if (authEntry != null) {
dataLength += RIPV2Entry.ENTRY_LEN;
}
final byte[] data = new byte[dataLength];
final ByteBuffer bb = ByteBuffer.wrap(data);
bb.put(this.cmdType);
bb.put(this.version);
bb.putShort(this.reserved);
if (authEntry != null) {
bb.put(authEntry.serialize());
}
for (final RIPV2Entry entry : this.rtEntries) {
bb.put(entry.serialize());
}
// assume the rest is padded out with zeroes
return data;
}
/**
* Deserializer function for RIP packets.
*
* @return deserializer function
*/
public static Deserializer deserializer() {
return (data, offset, length) -> {
RIP rip = new RIP();
checkInput(data, offset, length, MIN_HEADER_LENGTH);
ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
rip.rawData = Arrays.copyOfRange(data, offset, offset + length);
rip.cmdType = bb.get();
rip.version = bb.get();
rip.reserved = bb.getShort();
// read route entries
while (bb.hasRemaining() && (bb.remaining() >= RIPV2Entry.ENTRY_LEN)) {
byte[] rtData = new byte[RIPV2Entry.ENTRY_LEN];
bb.get(rtData);
if (rtData[0] == -1 && rtData[1] == -1) {
// second time reaching here is the signature at the end of the packet, don't process it
if (rip.authEntry == null) {
rip.authEntry = RIPV2AuthEntry.deserializer().deserialize(rtData, 0, rtData.length);
}
} else {
RIPV2Entry rtEntry = RIPV2Entry.deserializer().deserialize(rtData, 0, rtData.length);
rip.rtEntries.add(rtEntry);
}
}
return rip;
};
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), cmdType, reserved, version, authEntry, rtEntries);
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof RIP)) {
return false;
}
final RIP that = (RIP) obj;
return super.equals(that) &&
Objects.equals(version, that.version) &&
Objects.equals(reserved, that.reserved) &&
Objects.equals(cmdType, that.cmdType) &&
Objects.equals(authEntry, that.authEntry) &&
Objects.equals(rtEntries, that.rtEntries);
}
@Override
public String toString() {
return toStringHelper(getClass())
.add("cmdType", Byte.toString(cmdType))
.add("version", Byte.toString(version))
.add("reserved", Short.toString(reserved))
.toString();
// TODO: need to handle route entries
}
}
