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com.voytechs.jnetstream.io
Class SnoopInputStream  

java.lang.Object
  java.io.InputStream
      com.voytechs.jnetstream.io.ProtocolDataInputStream
          com.voytechs.jnetstream.io.PacketInputStream
              com.voytechs.jnetstream.io.SnoopInputStream

All Implemented Interfaces:

java.io.Closeable

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public class SnoopInputStream

extends PacketInputStream

For structure of the Snoop file see RFC1761 http://www.faqs.org/rfcs/rfc1761.html

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Field Summary
private static boolean	debug
private static java.lang.String[]	linkNames
private static byte[]	SNOOP_MAGIC_NUMBER
private  long	snoopCumulativeDrops
private  long	snoopLinktype
private  byte[]	snoopMagicNumber
private  long	snoopMajorVer
private  long	snoopPacketCaptureNanos
private  long	snoopPacketCaptureSecs
private  long	snoopPacketLength
private  long	snoopRecordLength
private  long	snoopSnaplen

 

Fields inherited from class com.voytechs.jnetstream.io.PacketInputStream

captureDeviceArch, captureDeviceFilename, captureDeviceIp, captureDeviceOS, captureLive, linkType, packetCaptureTimestamp, packetEnd, packetLength, packetSnaplen, packetStart, recordEnd, recordLength, recordStart, stackIn

 

Fields inherited from class com.voytechs.jnetstream.io.ProtocolDataInputStream

bitsLeft, in

 

Constructor Summary

SnoopInputStream(java.io.InputStream snoopFileFormatInputStream)

SnoopInputStream(java.lang.String filename)           Opens up the given file and starts processing the data.

 

Method Summary
byte[]	getSnoopMagicNumber()           Returns the magic number found at the beginning of the SNOOP file.
long	getSnoopMajorVer()           Returns the major version number of the SNOOP file.
protected  void	initPacketStream()           Since we know we are dealing with a Snoop-file formatted stream (i.e.
static void	main(java.lang.String[] args)           Test function for SnoopInputStream
protected  void	readPacketPreHeader()           Read pre-packet header from stream.
long	snoopLinktype()           The link type of the first header in the packet.
long	snoopPacketCaptureNanos()           Number of naono seconds found in the raw data file.
long	snoopPacketCaptureSecs()           Number of raw number of the capture file.
long	snoopSnaplen()           Retuns the SNAP len of the capture file.
java.lang.String	toString()           Convert this Object to a human-readable String.

 

Methods inherited from class com.voytechs.jnetstream.io.PacketInputStream

bitsLeft, clear, getCaptureDeviceAddress, getCaptureDeviceArch, getCaptureDeviceFilename, getCaptureDeviceIp, getCaptureDeviceOS, getCaptureTimestamp, getLinkType, getPacketEnd, getPacketLength, getPacketLengthRemaining, getPacketSnaplen, getPacketStart, getRecordEnd, getRecordHeaderLength, getRecordLength, getRecordStart, goToEndOfRecord, gotoMark, hasForceRead, hex, isCaptureLive, isPacketReady, isReady, isReady, nextPacket, pop, position, printStream, push, push, read, setCaptureTimestamp, setForceRead, setLinkType, setPacketLength, setPacketSnaplen, setPacketStart, setRecordLength, setRecordStart, skip

 

Methods inherited from class com.voytechs.jnetstream.io.ProtocolDataInputStream

readBits, readBitsLong, readBoolean, readByte, readFromPacket, readFromPacket, readInt, readIntLittleEndian, readLong, readLongLittleEndian, readShort, readShortLittleEndian, readUnsignedByte, readUnsignedInt, readUnsignedIntLittleEndian, readUnsignedShort, readUnsignedShortLittleEndian, reThrow

 

Methods inherited from class java.io.InputStream

available, close, mark, markSupported, read, read, reset

 

Methods inherited from class java.lang.Object

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

 

Field Detail

debug

private static final boolean debug

See Also:

Constant Field Values

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SNOOP_MAGIC_NUMBER

private static final byte[] SNOOP_MAGIC_NUMBER

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snoopMagicNumber

private byte[] snoopMagicNumber

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snoopMajorVer

private long snoopMajorVer

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snoopSnaplen

private long snoopSnaplen

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snoopLinktype

private long snoopLinktype

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snoopPacketCaptureSecs

private long snoopPacketCaptureSecs

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snoopPacketCaptureNanos

private long snoopPacketCaptureNanos

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snoopPacketLength

private long snoopPacketLength

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snoopRecordLength

private long snoopRecordLength

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snoopCumulativeDrops

private long snoopCumulativeDrops

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linkNames

private static java.lang.String[] linkNames

Constructor Detail

SnoopInputStream

public SnoopInputStream(java.io.InputStream snoopFileFormatInputStream)
                 throws java.io.IOException,
                        EOPacketStream,
                        StreamFormatException

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SnoopInputStream

public SnoopInputStream(java.lang.String filename)
                 throws java.io.FileNotFoundException,
                        java.io.IOException,
                        EOPacketStream,
                        StreamFormatException

Opens up the given file and starts processing the data.

Method Detail

initPacketStream

protected void initPacketStream()
                         throws java.io.IOException,
                                EOPacketStream,
                                StreamFormatException

Since we know we are dealing with a Snoop-file formatted stream (i.e. FileInputStream("snoop-capturefile.snoop")) we initialize the ProtocolInputStream using values extracted from the snoop stream. First we extract the "snoop_file_heaer" as specified above.

Overrides:

initPacketStream in class PacketInputStream

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readPacketPreHeader

protected void readPacketPreHeader()
                            throws java.io.IOException,
                                   EOPacketStream,
                                   StreamFormatException

Read pre-packet header from stream. With basic info about the next packet to follow. this is called for every packet in the stream. Main purpose is to get packet-data length (or length of captured packet) and the capture time of the packet.

Overrides:

readPacketPreHeader in class PacketInputStream

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toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

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getSnoopMagicNumber

public byte[] getSnoopMagicNumber()

Returns the magic number found at the beginning of the SNOOP file.

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getSnoopMajorVer

public long getSnoopMajorVer()

Returns the major version number of the SNOOP file.

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snoopSnaplen

public long snoopSnaplen()

Retuns the SNAP len of the capture file. This is the number of bytes that we saved, not captured. i.e. first 128 bytes.

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snoopLinktype

public long snoopLinktype()

The link type of the first header in the packet. Normally this is type 2 (ethernet) but any of the others are possible as well.

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snoopPacketCaptureSecs

public long snoopPacketCaptureSecs()

Number of raw number of the capture file. JNetStream library multiplies this number by factor of 1000 before returning it.

This value changes from packet to packet.

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snoopPacketCaptureNanos

public long snoopPacketCaptureNanos()

Number of naono seconds found in the raw data file. This number is also multiplied by 1000.

This value changes from packet to packet.

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main

public static void main(java.lang.String[] args)

Test function for SnoopInputStream

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