org.scion.jpan.internal

Class ScionHeaderParser

java.lang.Object

org.scion.jpan.internal.ScionHeaderParser

public class ScionHeaderParser
extends Object

Utility methods for reading and writing the Common Header and Address Header.

Method Summary

Modifier and Type	Method and Description
static InetSocketAddress	extractDestinationSocketAddress(ByteBuffer data)
static int	extractHeaderLength(ByteBuffer data) Extract the header length without changing the buffer's position.
static InternalConstants.HdrTypes	extractNextHeader(ByteBuffer data) Extract the next header type without changing the buffer's position.
static int	extractPacketLength(ByteBuffer data) Extract the total packet length without changing the buffer's position.
static int	extractPathHeaderPosition(ByteBuffer data) Extract the position of the path header.
static ResponsePath	extractResponsePath(ByteBuffer data, InetSocketAddress firstHopAddress) Extract the remote socket address and path without changing the buffer's position.
static void	extractUserPayload(ByteBuffer data, ByteBuffer userBuffer) Extract the user payload data without changing the buffer's position.
static void	reversePathInPlace(ByteBuffer data)
static String	validate(ByteBuffer data)
static void	write(ByteBuffer data, int userPacketLength, int pathHeaderLength, long srcIsdAs, byte[] srcAddress, long dstIsdAs, byte[] dstAddress, InternalConstants.HdrTypes hdrType, int trafficClass)
static void	writePath(ByteBuffer data, byte[] path)
static void	writeUdpOverlayHeader(ByteBuffer data, int packetLength, int srcPort, int dstPort)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

extractUserPayload

public static void extractUserPayload(ByteBuffer data,
                                      ByteBuffer userBuffer)

Extract the user payload data without changing the buffer's position.

Parameters:

data - The datagram to read from.

userBuffer - Buffer in which to write the user payload.

extractPacketLength

public static int extractPacketLength(ByteBuffer data)

Extract the total packet length without changing the buffer's position.

Parameters:

data - The datagram to read from.

extractResponsePath

public static ResponsePath extractResponsePath(ByteBuffer data,
                                               InetSocketAddress firstHopAddress)

Extract the remote socket address and path without changing the buffer's position.

Parameters:

data - The datagram to read from.

Returns:

A new ScionSocketAddress including raw path.

extractNextHeader

public static InternalConstants.HdrTypes extractNextHeader(ByteBuffer data)

Extract the next header type without changing the buffer's position.

Parameters:

data - The datagram to read from.

Returns:

The type of the next header.

extractDestinationSocketAddress

public static InetSocketAddress extractDestinationSocketAddress(ByteBuffer data)
                                                         throws UnknownHostException

Throws:

UnknownHostException

extractHeaderLength

public static int extractHeaderLength(ByteBuffer data)

Extract the header length without changing the buffer's position.

Parameters:

data - The packet buffer

Returns:

the length of the SCION common + address + path header in bytes

extractPathHeaderPosition

public static int extractPathHeaderPosition(ByteBuffer data)

Extract the position of the path header.

Parameters:

data - The packet buffer

Returns:

the position of the path header or -1 if no path is available

validate

public static String validate(ByteBuffer data)

write

public static void write(ByteBuffer data,
                         int userPacketLength,
                         int pathHeaderLength,
                         long srcIsdAs,
                         byte[] srcAddress,
                         long dstIsdAs,
                         byte[] dstAddress,
                         InternalConstants.HdrTypes hdrType,
                         int trafficClass)

reversePathInPlace

public static void reversePathInPlace(ByteBuffer data)

writePath

public static void writePath(ByteBuffer data,
                             byte[] path)

writeUdpOverlayHeader

public static void writeUdpOverlayHeader(ByteBuffer data,
                                         int packetLength,
                                         int srcPort,
                                         int dstPort)