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com.voytechs.jnetstream.io
Class PcapInputStream  

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

All Implemented Interfaces:

java.io.Closeable

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public class PcapInputStream

extends PacketInputStream

Structure of TCPDump file.
struct pcap_file_header {
bpf_u_int32 magic;
u_short version_major;
u_short version_minor;
bpf_int32 thiszone; // gmt to local correction //
bpf_u_int32 sigfigs; // accuracy of timestamps //
bpf_u_int32 snaplen; // max length saved portion of each pkt //
bpf_u_int32 linktype; // data link type (LINKTYPE_*) //
};

Now per each packet:
struct pcap_pkthdr {
struct timeval ts; // time stamp //
bpf_u_int32 caplen; // length of portion present //
bpf_u_int32 len; // length this packet (off wire) //
};


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Field Summary
private static boolean	debug
private static int	PCAP_MAGIC_NUMBER1
private static int	PCAP_MAGIC_NUMBER2
private  int	pcapLinktype
private  int	pcapMagicNumber
private  int	pcapMajorVer
private  int	pcapMinorVer
private  int	pcapPacketCaptureNanos
private  long	pcapPacketCaptureSecs
private  long	pcapPacketLength
private  long	pcapSnaplen
private  int	pcapTimestampAccuracy
private  int	pcapTimezone

 

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

PcapInputStream(java.io.InputStream pcapFileFormatInputStream)

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

 

Method Summary
int	getPcapMagicNumber()           Returns the magic number found at the beginning of the PCAP file.
int	getPcapMajorVer()           Returns the major version number of the PCAP file.
int	getPcapMinorVer()           Returns the minor version number of the PCAP file.
protected  void	initPacketStream()           Since we know we are dealing with a Pcap-file formatted stream (i.e.
static void	main(java.lang.String[] args)           Test function for PcapInputStream
int	pcapLinktype()           The link type of the first header in the packet.
int	pcapPacketCaptureNanos()           Number of naono seconds found in the raw data file.
long	pcapPacketCaptureSecs()           Number of raw number of the capture file.
long	pcapSnaplen()           Retuns the SNAP len of the capture file.
int	pcapTimestampAccuracy()           Returns the timestamp accuracy found in the PCAP file.
int	pcapTimezone()           Returns the timezone found in the PCAP file.
protected  void	readPacketPreHeader()           Read pre-packet header from stream.
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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PCAP_MAGIC_NUMBER1

private static final int PCAP_MAGIC_NUMBER1

See Also:

Constant Field Values

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PCAP_MAGIC_NUMBER2

private static final int PCAP_MAGIC_NUMBER2

See Also:

Constant Field Values

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pcapMagicNumber

private int pcapMagicNumber

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pcapMajorVer

private int pcapMajorVer

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pcapMinorVer

private int pcapMinorVer

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pcapTimezone

private int pcapTimezone

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pcapTimestampAccuracy

private int pcapTimestampAccuracy

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pcapPacketLength

private long pcapPacketLength

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pcapSnaplen

private long pcapSnaplen

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pcapLinktype

private int pcapLinktype

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pcapPacketCaptureSecs

private long pcapPacketCaptureSecs

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pcapPacketCaptureNanos

private int pcapPacketCaptureNanos

Constructor Detail

PcapInputStream

public PcapInputStream(java.io.InputStream pcapFileFormatInputStream)
                throws java.io.IOException,
                       EOPacketStream,
                       StreamFormatException

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PcapInputStream

public PcapInputStream(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 Pcap-file formatted stream (i.e. FileInputStream("pcap-capturefile.pcap")) we initialize the ProtocolInputStream using values extracted from the pcap stream. First we extract the "pcap_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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getPcapMagicNumber

public int getPcapMagicNumber()

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

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getPcapMajorVer

public int getPcapMajorVer()

Returns the major version number of the PCAP file.

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getPcapMinorVer

public int getPcapMinorVer()

Returns the minor version number of the PCAP file.

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pcapTimezone

public int pcapTimezone()

Returns the timezone found in the PCAP file. The timezone is used for proper timestamp calculations of the captured packet.

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pcapTimestampAccuracy

public int pcapTimestampAccuracy()

Returns the timestamp accuracy found in the PCAP file.

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pcapSnaplen

public long pcapSnaplen()

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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pcapLinktype

public int pcapLinktype()

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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pcapPacketCaptureSecs

public long pcapPacketCaptureSecs()

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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pcapPacketCaptureNanos

public int pcapPacketCaptureNanos()

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 PcapInputStream

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> voytechs >> jnetstream >> [ io overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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