-
/*
* Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
*
import org.slf4j.LoggerFactory;
/**
- * Abstract class which represents the generic network packet object
- * It provides the basic methods which are common for all the packets,
- * like serialize and deserialize
- *
- *
+ * Abstract class which represents the generic network packet object It provides
+ * the basic methods which are common for all the packets, like serialize and
+ * deserialize
+ *
+ *
*/
public abstract class Packet {
protected static final Logger logger = LoggerFactory
- .getLogger(Packet.class);
+ .getLogger(Packet.class);
// Access level granted to this packet
protected boolean writeAccess;
// When deserialized from wire, packet could result corrupted
}
/**
- * This method deserializes the data bits obtained from the wire
- * into the respective header and payload which are of type Packet
+ * This method deserializes the data bits obtained from the wire into the
+ * respective header and payload which are of type Packet
+ *
* @param byte[] data - data from wire to deserialize
- * @param int bitOffset bit position where packet header starts in data array
+ * @param int bitOffset bit position where packet header starts in data
+ * array
* @param int size of packet in bits
* @return Packet
- * @throws Exception
+ * @throws PacketException
*/
public Packet deserialize(byte[] data, int bitOffset, int size)
- throws Exception {
+ throws PacketException {
String hdrField;
Integer startOffset = 0, numBits = 0;
byte[] hdrFieldBytes;
startOffset = bitOffset + this.getfieldOffset(hdrField);
numBits = this.getfieldnumBits(hdrField);
- hdrFieldBytes = BitBufferHelper.getBits(data, startOffset, numBits);
+ try {
+ hdrFieldBytes = BitBufferHelper.getBits(data, startOffset,
+ numBits);
+ } catch (BufferException e) {
+ throw new PacketException(e.getMessage());
+ }
/*
- * Store the raw read value, checks the payload type and
- * set the payloadClass accordingly
+ * Store the raw read value, checks the payload type and set the
+ * payloadClass accordingly
*/
this.setHeaderField(hdrField, hdrFieldBytes);
}
postDeserializeCustomOperation(data, startOffset);
int payloadStart = startOffset + numBits;
- //int payloadSize = size - payloadStart;
+ // int payloadSize = size - payloadStart;
int payloadSize = data.length * NetUtils.NumBitsInAByte - payloadStart;
if (payloadClass != null) {
}
/**
- * This method serializes the header and payload bytes from
- * the respective packet class, into a single stream of bytes
- * to be sent on the wire
+ * This method serializes the header and payload bytes from the respective
+ * packet class, into a single stream of bytes to be sent on the wire
+ *
* @return byte[] - serialized bytes
- * @throws Exception
+ * @throws PacketException
*/
- public byte[] serialize() throws Exception {
+ public byte[] serialize() throws PacketException {
byte[] payloadBytes = null;
int payloadSize = 0;
int headerSize = this.getHeaderSize();
if (fieldBytes != null) {
startOffset = this.getfieldOffset(field);
numBits = this.getfieldnumBits(field);
- BitBufferHelper.setBytes(headerBytes, fieldBytes, startOffset,
- numBits);
+ try {
+ BitBufferHelper.setBytes(headerBytes, fieldBytes,
+ startOffset, numBits);
+ } catch (BufferException e) {
+ throw new PacketException(e.getMessage());
+ }
}
}
postSerializeCustomOperation(headerBytes);
}
/**
- * This method gets called at the end of the serialization process
- * It is intended for the child packets to insert some custom data
- * into the output byte stream which cannot be done or cannot be done
- * efficiently during the normal Packet.serialize() path.
- * An example is the checksum computation for IPv4
+ * This method gets called at the end of the serialization process It is
+ * intended for the child packets to insert some custom data into the output
+ * byte stream which cannot be done or cannot be done efficiently during the
+ * normal Packet.serialize() path. An example is the checksum computation
+ * for IPv4
+ *
* @param byte[] - serialized bytes
+ * @throws PacketException
*/
protected void postSerializeCustomOperation(byte[] myBytes)
- throws Exception {
+ throws PacketException {
// no op
}
/**
- * This method re-computes the checksum of the bits received on the
- * wire and validates it with the checksum in the bits received
- * Since the computation of checksum varies based on the protocol,
- * this method is overridden
- * Currently only IPv4 does checksum computation and validation
- * TCP and UDP need to implement these if required
+ * This method re-computes the checksum of the bits received on the wire and
+ * validates it with the checksum in the bits received Since the computation
+ * of checksum varies based on the protocol, this method is overridden
+ * Currently only IPv4 does checksum computation and validation TCP and UDP
+ * need to implement these if required
+ *
* @param byte[] data
* @param int endBitOffset
- * @return void
+ * @throws PacketException
*/
protected void postDeserializeCustomOperation(byte[] data, int endBitOffset)
- throws Exception {
- // no op
+ throws PacketException {
+ // no op
}
/**
* Gets the header length in bits
- * @return int
- * @throws Exception
+ *
+ * @return int the header length in bits
*/
- public int getHeaderSize() throws Exception {
+ public int getHeaderSize() {
int size = 0;
/*
- * We need to iterate over the fields that were read in the frame (hdrFieldsMap)
- * not all the possible ones described in hdrFieldCoordMap.
- * For ex, 802.1Q may or may not be there
+ * We need to iterate over the fields that were read in the frame
+ * (hdrFieldsMap) not all the possible ones described in
+ * hdrFieldCoordMap. For ex, 802.1Q may or may not be there
*/
for (Map.Entry<String, byte[]> fieldEntry : hdrFieldsMap.entrySet()) {
if (fieldEntry.getValue() != null) {
/**
* This method fetches the start bit offset for header field specified by
- * 'fieldname'. The offset is present in the hdrFieldCoordMap of the respective
- * packet class
- * @param String fieldName
+ * 'fieldname'. The offset is present in the hdrFieldCoordMap of the
+ * respective packet class
+ *
+ * @param String
+ * fieldName
* @return Integer - startOffset of the requested field
*/
public int getfieldOffset(String fieldName) {
/**
* This method fetches the number of bits for header field specified by
- * 'fieldname'. The numBits are present in the hdrFieldCoordMap of the respective
- * packet class
- * @param String fieldName
+ * 'fieldname'. The numBits are present in the hdrFieldCoordMap of the
+ * respective packet class
+ *
+ * @param String
+ * fieldName
* @return Integer - number of bits of the requested field
*/
- public int getfieldnumBits(String fieldName) throws Exception {
+ public int getfieldnumBits(String fieldName) {
return (((Pair<Integer, Integer>) hdrFieldCoordMap.get(fieldName))
.getRight());
}
} else if (entry.getValue().length == 4) {
try {
ret.append(InetAddress.getByAddress(entry.getValue())
- .getHostAddress()
- + " ");
+ .getHostAddress() + " ");
} catch (UnknownHostException e) {
- logger.error("",e);
+ logger.error("", e);
}
} else {
ret.append(((Long) BitBufferHelper.getLong(entry.getValue()))
- .toString()
- + " ");
+ .toString() + " ");
}
}
return ret.toString();
/**
* Returns true if the packet is corrupted
+ *
* @return boolean
*/
protected boolean isPacketCorrupted() {
Code Review / controller.git / blobdiff