Package org.xbill.DNS

Class Header

java.lang.Object
org.xbill.DNS.Header
All Implemented Interfaces:
Cloneable
public class Header extends Object implements Cloneable
A DNS message header
Author:
Brian Wellington
See Also:

  • Field Summary

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

  • Constructor Summary

    Constructors
    Constructor
    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
    Description
    Header
    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
    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
    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 Details

    • LENGTH

      public static final int LENGTH
      The length of a DNS Header in wire format.
      See Also:

  • Constructor Details

    • 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 IOException
      Creates a new Header from its DNS wire format representation
      Parameters:
      b - A byte array containing the DNS Header.
      Throws:
      IOException

  • Method Details

    • toWire

      public byte[] toWire()

    • setFlag

      public void setFlag(int bit)
      Sets a flag to the supplied value
      See Also:

    • unsetFlag

      public void unsetFlag(int bit)
      Sets a flag to the supplied value
      See Also:

    • getFlag

      public boolean getFlag(int bit)
      Retrieves a flag
      See Also:

    • 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:

    • getRcode

      public int getRcode()
      Retrieves the mesasge's rcode
      See Also:

    • setOpcode

      public void setOpcode(int value)
      Sets the message's opcode
      See Also:

    • getOpcode

      public int getOpcode()
      Retrieves the mesasge's opcode
      See Also:

    • getCount

      public int getCount(int field)
      Retrieves the record count for the given section
      See Also:

    • printFlags

      public String printFlags()
      Converts the header's flags into a String

    • toString

      public String toString()
      Converts the header into a String
      Overrides:
      toString in class Object

    • clone

      public Header clone()
      Overrides:
      clone in class Object