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

public class SnoopInputStream
extends PacketInputStream

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

Nested Class Summary

Nested classes/interfaces inherited from class com.voytechs.jnetstream.io.PacketInputStream

PacketInputStream.BufferedHeader

Field Summary

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

captureDeviceArch, captureDeviceFilename, captureDeviceIp, captureDeviceOS, captureLive, debugHeaders, fileHeader, linkType, packetCaptureTimestamp, packetEnd, packetLength, packetSnaplen, packetStart, recordEnd, recordHeader, 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.
protected void	initRecordHeader() 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()

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

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

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

readBits, readBitsLong, readBoolean, readByte, readerUnsignedLongLittleEndian, readFromPacket, readFromPacket, readInt, readIntLittleEndian, readLong, readLongLittleEndian, readShort, readShortLittleEndian, readUnsignedByte, readUnsignedInt, readUnsignedIntLittleEndian, readUnsignedLong, 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

Constructor Detail

SnoopInputStream

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

Parameters:

-

Throws:

java.io.IOException

EOPacketStream

StreamFormatException

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.

Parameters:

filename - Filename of the file in SNOOP fileformat to open.

Throws:

java.io.FileNotFoundException

java.io.IOException

EOPacketStream

StreamFormatException

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

Throws:

java.io.IOException

EOPacketStream

StreamFormatException

initRecordHeader

protected void initRecordHeader()
                         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:

initRecordHeader in class PacketInputStream

Throws:

java.io.IOException

EOPacketStream

StreamFormatException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getSnoopMagicNumber

public byte[] getSnoopMagicNumber()

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

getSnoopMajorVer

public long getSnoopMajorVer()

Returns the major version number of the SNOOP file.

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.

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.

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.

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.