org.xbill.DNS

Class Header

java.lang.Object

org.xbill.DNS.Header

All Implemented Interfaces:

java.lang.Cloneable

public class Header
extends java.lang.Object
implements java.lang.Cloneable

A DNS message header

Author:

Brian Wellington

See Also:

Message

Field Summary

Fields

Modifier and Type	Field and Description
static int	LENGTH The length of a DNS Header in wire format.

Constructor Summary

Constructors

Constructor and Description
Header() Create a new empty header with a random message id
Header(byte[] b) Creates a new Header from its DNS wire format representation
Header(int id) Create a new empty header.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone()
int	getCount(int field) Retrieves the record count for the given section
boolean	getFlag(int bit) Retrieves a flag
int	getID() Retrieves the message ID
int	getOpcode() Retrieves the mesasge's opcode
int	getRcode() Retrieves the mesasge's rcode
java.lang.String	printFlags() Converts the header's flags into a String
void	setFlag(int bit) Sets a flag to the supplied value
void	setID(int id) Sets the message ID
void	setOpcode(int value) Sets the message's opcode
void	setRcode(int value) Sets the message's rcode
java.lang.String	toString() Converts the header into a String
byte[]	toWire()
void	unsetFlag(int bit) Sets a flag to the supplied value

Methods inherited from class java.lang.Object

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

Field Detail

LENGTH

public static final int LENGTH

The length of a DNS Header in wire format.

See Also:

Constant Field Values

Constructor Detail

Header

public Header(int id)

Create a new empty header.

Parameters:

id - The message id

Header

public Header()

Create a new empty header with a random message id

Header

public Header(byte[] b)
       throws java.io.IOException

Creates a new Header from its DNS wire format representation

Parameters:

b - A byte array containing the DNS Header.

Throws:

java.io.IOException

Method Detail

toWire

public byte[] toWire()

setFlag

public void setFlag(int bit)

Sets a flag to the supplied value

See Also:

Flags

unsetFlag

public void unsetFlag(int bit)

Sets a flag to the supplied value

See Also:

Flags

getFlag

public boolean getFlag(int bit)

Retrieves a flag

See Also:

Flags

getID

public int getID()

Retrieves the message ID

setID

public void setID(int id)

Sets the message ID

setRcode

public void setRcode(int value)

Sets the message's rcode

See Also:

Rcode

getRcode

public int getRcode()

Retrieves the mesasge's rcode

See Also:

Rcode

setOpcode

public void setOpcode(int value)

Sets the message's opcode

See Also:

Opcode

getOpcode

public int getOpcode()

Retrieves the mesasge's opcode

See Also:

Opcode

getCount

public int getCount(int field)

Retrieves the record count for the given section

See Also:

Section

printFlags

public java.lang.String printFlags()

Converts the header's flags into a String

toString

public java.lang.String toString()

Converts the header into a String

Overrides:

toString in class java.lang.Object

clone

public java.lang.Object clone()

Overrides:

clone in class java.lang.Object