verinec.adaptation.snmp.tftpserver
Class TFTPPacket

java.lang.Object
  verinec.adaptation.snmp.tftpserver.TFTPPacket

public class TFTPPacket
extends Object

Class responsible for encapsulating TFTP packets. It is actually a straight forward implementation of the RFC 1350.

Most of the source was taken from http://www.it.rit.edu/~netsyslb/vksf522/class_examples/Day09_TFTPServer/TFTPPacket.pdf
I removed the gui part.

Version:

1.0

Author:

christoph.ehret at unifr.ch

Field Summary

static int	ACCESVIOLATION Access violation error code
static int	ACK ACK opcode
private int	blkNo
private byte[]	data
static int	DATA Data opcode
static int	DISKFULL Disk full error code
private String	errMsg
private int	errNo
static int	ERROR Error opcode
static int	FILEEXISTS File exists error code
static int	FILENOTFOUND File not found error code
private String	fname
static int	ILLEGALOPERATION Illegal operation error code
private Logger	logger
private String	mode
static int	NOSUCHUSER No such user error code
private int	opcode
static int	RRQ Read Request opcode
static int	UNKNOWN Unknown opcode
static int	UNKNOWNCODE Unknowncode error code
static int	UNKNOWNTID Unknown TID error code
static int	WRQ Write Request opcode

Constructor Summary

TFTPPacket()

Method Summary

byte[]	build() Builds a TFTP packet
void	clearPacket() Method to put all the packet fields to their default value
int	getBlockNo() Gets the block number of the packet
byte[]	getData() Gets the data
String	getErrorMsg() Gets the error message
int	getErrorNo() Gets the error opcode number
String	getFName() Gets the name of the file to write
String	getMode() Gets the mode to use
int	getOpcode() Gets the opcode
void	parse(byte[] rawPacket, int offset, int length) Parses a raw packet to get different informations
String	readNTString(DataInputStream dis) Reads a null terminated string for a data input stream
void	setBlockNo(int blkNo) Sets the blocknumber of the packet
void	setData(byte[] data) Sets the data
void	setErrorMsg(String errMsg) Sets the error message
void	setErrorNo(int errNo) Sets the error number, i.e one of the error codes
void	setFName(String fname) Sets the name of the file to write
void	setMode(String mode) Sets the mode
void	setOpcode(int opcode) Sets the data opcode to the given opcode

Methods inherited from class java.lang.Object

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

Field Detail

logger

private Logger logger

RRQ

public static final int RRQ

Read Request opcode

See Also:

Constant Field Values

WRQ

public static final int WRQ

Write Request opcode

See Also:

Constant Field Values

DATA

public static final int DATA

Data opcode

See Also:

Constant Field Values

ACK

public static final int ACK

ACK opcode

See Also:

Constant Field Values

ERROR

public static final int ERROR

Error opcode

See Also:

Constant Field Values

UNKNOWN

public static final int UNKNOWN

Unknown opcode

See Also:

Constant Field Values

UNKNOWNCODE

public static final int UNKNOWNCODE

Unknowncode error code

See Also:

Constant Field Values

FILENOTFOUND

public static final int FILENOTFOUND

File not found error code

See Also:

Constant Field Values

ACCESVIOLATION

public static final int ACCESVIOLATION

Access violation error code

See Also:

Constant Field Values

DISKFULL

public static final int DISKFULL

Disk full error code

See Also:

Constant Field Values

ILLEGALOPERATION

public static final int ILLEGALOPERATION

Illegal operation error code

See Also:

Constant Field Values

UNKNOWNTID

public static final int UNKNOWNTID

Unknown TID error code

See Also:

Constant Field Values

FILEEXISTS

public static final int FILEEXISTS

File exists error code

See Also:

Constant Field Values

NOSUCHUSER

public static final int NOSUCHUSER

No such user error code

See Also:

Constant Field Values

opcode

private int opcode

fname

private String fname

mode

private String mode

blkNo

private int blkNo

data

private byte[] data

errNo

private int errNo

errMsg

private String errMsg

Constructor Detail

TFTPPacket

public TFTPPacket()

Method Detail

setOpcode

public void setOpcode(int opcode)

Sets the data opcode to the given opcode

Parameters:

opcode - Opcode number that specifies the data identity

setFName

public void setFName(String fname)

Sets the name of the file to write

Parameters:

fname - Name of the file to write

setMode

public void setMode(String mode)

Sets the mode

Parameters:

mode - Mode to use

setBlockNo

public void setBlockNo(int blkNo)

Sets the blocknumber of the packet

Parameters:

blkNo - Block number of the packet

setData

public void setData(byte[] data)

Sets the data

Parameters:

data - Data

setErrorNo

public void setErrorNo(int errNo)

Sets the error number, i.e one of the error codes

Parameters:

errNo -

setErrorMsg

public void setErrorMsg(String errMsg)

Sets the error message

Parameters:

errMsg - Error message

getOpcode

public int getOpcode()

Gets the opcode

Returns:

Opcode number

getFName

public String getFName()

Gets the name of the file to write

Returns:

Name of the file to write

getMode

public String getMode()

Gets the mode to use

Returns:

Mode to use

getBlockNo

public int getBlockNo()

Gets the block number of the packet

Returns:

Block number of the packet

getData

public byte[] getData()

Gets the data

Returns:

Data

getErrorNo

public int getErrorNo()

Gets the error opcode number

Returns:

Error opcode number

getErrorMsg

public String getErrorMsg()

Gets the error message

Returns:

Error message

parse

public void parse(byte[] rawPacket,
                  int offset,
                  int length)

Parses a raw packet to get different informations

Parameters:

rawPacket - Raw data

offset - Offset from where begining to read in rawPacket

length - Number of bytes to read in rawPacket

build

public byte[] build()

Builds a TFTP packet

Returns:

The byte array for the packet

clearPacket

public void clearPacket()

Method to put all the packet fields to their default value

readNTString

public String readNTString(DataInputStream dis)
                    throws IOException

Reads a null terminated string for a data input stream

Parameters:

dis - The stream to read from.

Returns:

The next null terminated string from dis.

Throws:

IOException - If reading the string fails.