com.antiaction.dns
Class DNSName

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

public class DNSName

extends java.lang.Object

DNS Name, handles domainname dis/assembling (including de/compression). As defined in rfc1035.

Version:

2.00

Author:

Nicholas Clarke

Constructor Summary

DNSName()
Construct a name object and initialize internal compression structures.

Method Summary

byte[]	buildPacket(int globalIdx, java.lang.String name, boolean useComp, boolean updComp) Build a sub packet containing the name with no, partial or full compresssion used.
java.lang.String	disassemblePacket(byte[] pDat, int pIdx, int pLen) Parses the name part of a packet and returns a string.
int	getDisassembledLen() Returns the length of the previously disassembled name.
void	printTree() Display the hashmap tree structure used for name compression, for debugging purposes only.
void	reset() Reset internal compression structures.
void	setDebug(boolean b) Toggle debug status.

Methods inherited from class java.lang.Object

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

Constructor Detail

DNSName

public DNSName()

Construct a name object and initialize internal compression structures.

Method Detail

setDebug

public void setDebug(boolean b)

Toggle debug status.

Parameters:

b - boolean.

reset

public void reset()

Reset internal compression structures.

buildPacket

public byte[] buildPacket(int globalIdx,
                          java.lang.String name,
                          boolean useComp,
                          boolean updComp)
                   throws DNSNameException

Build a sub packet containing the name with no, partial or full compresssion used.

Parameters:

globalIdx - used to index labels across names.

name - domain name.

useComp - use compression to build the name.

updComp - update the compression tree structure with new labels.

Throws:

DNSNameException - if the domain name is invalid.

getDisassembledLen

public int getDisassembledLen()

Returns the length of the previously disassembled name.

Returns:

length of previously disassembled name.

See Also:

disassemblePacket(byte[], int, int)

disassemblePacket

public java.lang.String disassemblePacket(byte[] pDat,
                                          int pIdx,
                                          int pLen)
                                   throws DNSException,
                                          DNSNameException

Parses the name part of a packet and returns a string.

Parameters:

pDat - array containing the complete packet.

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

pLen - length of the whole packet.

Returns:

domain name in string form.

Throws:

DNSNameException - if the domain name is invalid.

See Also:

getDisassembledLen()

printTree

public void printTree()

Display the hashmap tree structure used for name compression, for debugging purposes only.