com.antiaction.dns
Class DNSQuestion

java.lang.Object
  |
  +--com.antiaction.dns.DNSQuestion

All Implemented Interfaces:

java.lang.Cloneable

public class DNSQuestion

extends java.lang.Object

implements java.lang.Cloneable

DNS Question, dis/assembles question portions of a DNS packet. As defined in rfc1035.

Version:

2.00

Author:

Nicholas Clarke

Field Summary

protected int	qclass Question class.
protected java.lang.String	qname Question name.
protected int	qtype Question type.

Constructor Summary

DNSQuestion()
Instantiate and initialize a default question object.

Method Summary

byte[]	buildPacket(DNSName dnsname, int globalIdx) Build and return the question based on the internal state.
java.lang.Object	clone() Overrides Cloneable.
void	disassemblePacket(DNSName dnsname, byte[] pDat, int pIdx, int pLen) Parses the question part of a packet.
int	getDisassembledLen() Returns the length of the previously disassembled question.
int	getQClass() Get the question class
java.lang.String	getQName() Get the question domain name.
int	getQType() Get the question type.
void	setDebug(boolean b) Toggle debug status.
void	setQClass(int qc) Set the question class.
void	setQName(java.lang.String s) Set the question domain name.
void	setQType(int qt) Set the question type.
java.lang.String	toString() Returns a string representation of the internal state, mostly for debugging purposes.

Methods inherited from class java.lang.Object

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

Field Detail

qname

protected java.lang.String qname

Question name.

qtype

protected int qtype

Question type.

qclass

protected int qclass

Question class.

Constructor Detail

DNSQuestion

public DNSQuestion()

Instantiate and initialize a default question object.

Method Detail

clone

public java.lang.Object clone()

Overrides Cloneable.

Overrides:

clone in class java.lang.Object

Returns:

a clone of this instance.

Throws:

OutOfMemoryError - if there is not enough memory.

See Also:

Cloneable

setDebug

public void setDebug(boolean b)

Toggle debug status.

Parameters:

b - boolean.

buildPacket

public byte[] buildPacket(DNSName dnsname,
                          int globalIdx)
                   throws DNSNameException

Build and return the question based on the internal state.

Parameters:

dnsname - used for domain name compression in the same message.

globalIdx - current index of the message being assembled. (Domain name compression)

Returns:

the question part of the message as a byte array.

Throws:

DNSNameException - if the domain name is invalid.

getDisassembledLen

public int getDisassembledLen()

Returns the length of the previously disassembled question.

Returns:

length of previously disassembled question.

See Also:

disassemblePacket(DNSName, byte[], int, int)

disassemblePacket

public void disassemblePacket(DNSName dnsname,
                              byte[] pDat,
                              int pIdx,
                              int pLen)
                       throws DNSException,
                              DNSNameException

Parses the question part of a packet.

Parameters:

dnsname - used for domain name compression in the same message.

pDat - array containing the complete packet.

pIdx - index to where in the array the question begins.

pLen - length of the whole packet.

Throws:

DNSException - if the packet is corrupted.

DNSNameException - if the domain name is invalid.

See Also:

getDisassembledLen()

setQName

public void setQName(java.lang.String s)

Set the question domain name.

Parameters:

s - domain name.

getQName

public java.lang.String getQName()

Get the question domain name.

Returns:

domain name.

setQType

public void setQType(int qt)

Set the question type.

Parameters:

qt - question type.

getQType

public int getQType()

Get the question type.

Returns:

question type.

setQClass

public void setQClass(int qc)

Set the question class.

Parameters:

qc - question class.

getQClass

public int getQClass()

Get the question class

Returns:

question class.

toString

public java.lang.String toString()

Returns a string representation of the internal state, mostly for debugging purposes.

Overrides:

toString in class java.lang.Object

Returns:

debug string.