net.clackrouter.jpcap
Class TcpdumpWriter

java.lang.Object
  net.clackrouter.jpcap.TcpdumpWriter

public class TcpdumpWriter
extends java.lang.Object

Writes data in tcpdump format. Unmodified and incorporated into Clack.

Field Summary

static int	BIG_ENDIAN
static int	CODE_ETHERNET
static int	LITTLE_ENDIAN
static int	MAJOR_VERSION
static int	MINOR_VERSION

Constructor Summary

TcpdumpWriter()

Method Summary

static void	appendPacket(java.lang.String filename, RawPacket rawPacket, int endian) A Tcpdump packet has the following format: seconds [4 bytes] microseconds [4 bytes] captured length [4 bytes] original packet length [4 bytes] packet data [variable length]
static void	appendVNSEthernetPacket(java.lang.String filename, VNSEthernetPacket ethPacket)
static void	writeHeader(java.lang.String filename, int endian, long snaplen) A Tcpdump file header is 24 bytes: 4 bytes: Tcpdump signature "magic number" 0xA1B2C3D4 2 bytes: Major version number, currently 2 2 bytes: Minor version number, currently 4 4 bytes: Time Zone offset, currently unused (set to zero) 4 bytes: Time stamp accuracy, currently unused (set to zero) 4 bytes: Snapshot length 4 bytes: Link-layer type, Ethernet for now

Methods inherited from class java.lang.Object

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

Field Detail

BIG_ENDIAN

public static final int BIG_ENDIAN

See Also:

Constant Field Values

LITTLE_ENDIAN

public static final int LITTLE_ENDIAN

See Also:

Constant Field Values

MAJOR_VERSION

public static final int MAJOR_VERSION

See Also:

Constant Field Values

MINOR_VERSION

public static final int MINOR_VERSION

See Also:

Constant Field Values

CODE_ETHERNET

public static final int CODE_ETHERNET

See Also:

Constant Field Values

Constructor Detail

TcpdumpWriter

public TcpdumpWriter()

Method Detail

writeHeader

public static void writeHeader(java.lang.String filename,
                               int endian,
                               long snaplen)
                        throws java.io.IOException

A Tcpdump file header is 24 bytes: 4 bytes: Tcpdump signature "magic number" 0xA1B2C3D4 2 bytes: Major version number, currently 2 2 bytes: Minor version number, currently 4 4 bytes: Time Zone offset, currently unused (set to zero) 4 bytes: Time stamp accuracy, currently unused (set to zero) 4 bytes: Snapshot length 4 bytes: Link-layer type, Ethernet for now

Throws:

java.io.IOException

appendVNSEthernetPacket

public static void appendVNSEthernetPacket(java.lang.String filename,
                                           VNSEthernetPacket ethPacket)
                                    throws java.lang.Exception

Throws:

java.lang.Exception

appendPacket

public static void appendPacket(java.lang.String filename,
                                RawPacket rawPacket,
                                int endian)
                         throws java.io.IOException

A Tcpdump packet has the following format: seconds [4 bytes] microseconds [4 bytes] captured length [4 bytes] original packet length [4 bytes] packet data [variable length]

Throws:

java.io.IOException