io.netty.handler.codec.dns

Class DnsQueryHeader

java.lang.Object

io.netty.handler.codec.dns.DnsHeader

io.netty.handler.codec.dns.DnsQueryHeader

public final class DnsQueryHeader
extends DnsHeader

The DNS query header class which is used to represent the 12 byte header in a DnsQuery.

Field Summary

Fields inherited from class io.netty.handler.codec.dns.DnsHeader

OPCODE_IQUERY, OPCODE_QUERY, TYPE_QUERY, TYPE_RESPONSE

Constructor Summary

Constructors

Constructor and Description
DnsQueryHeader(DnsMessage parent, int id) Constructor for a DNS packet query header.

Method Summary

Methods

Modifier and Type	Method and Description
DnsQueryHeader	setId(int id) Sets the id for this DnsMessage.
DnsQueryHeader	setOpcode(int opcode) Sets the opcode for this DnsMessage.
DnsQueryHeader	setRecursionDesired(boolean recursionDesired) Sets whether a name server is directed to pursue a query recursively or not.
DnsQueryHeader	setType(int type) Sets the DnsHeader type.
DnsQueryHeader	setZ(int z) Sets the field Z.
int	type() Returns the DnsMessage type.

Methods inherited from class io.netty.handler.codec.dns.DnsHeader

additionalResourceCount, answerCount, authorityResourceCount, id, isRecursionDesired, opcode, questionCount, z

Methods inherited from class java.lang.Object

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

Constructor Detail

DnsQueryHeader

public DnsQueryHeader(DnsMessage parent,
              int id)

Constructor for a DNS packet query header. The id is user generated and will be replicated in the response packet by the server.

Parameters:

parent - the DnsMessage this header belongs to

id - a 2 bit unsigned identification number for this query

Method Detail

type

public int type()

Returns the DnsMessage type. This will always return TYPE_QUERY.

Overrides:

type in class DnsHeader

See Also:

DnsHeader.TYPE_QUERY

setType

public DnsQueryHeader setType(int type)

Sets the DnsHeader type. Must be TYPE_RESPONSE.

Overrides:

setType in class DnsHeader

Parameters:

type - message type

Returns:

the header to allow method chaining

setId

public DnsQueryHeader setId(int id)

Description copied from class: DnsHeader

Sets the id for this DnsMessage.

Overrides:

setId in class DnsHeader

Parameters:

id - a unique 2 byte unsigned identifier

Returns:

the header to allow method chaining

setRecursionDesired

public DnsQueryHeader setRecursionDesired(boolean recursionDesired)

Description copied from class: DnsHeader

Sets whether a name server is directed to pursue a query recursively or not.

Overrides:

setRecursionDesired in class DnsHeader

Parameters:

recursionDesired - if set to true, pursues query recursively

Returns:

the header to allow method chaining

setOpcode

public DnsQueryHeader setOpcode(int opcode)

Description copied from class: DnsHeader

Sets the opcode for this DnsMessage.

Overrides:

setOpcode in class DnsHeader

Parameters:

opcode - opcode to set

Returns:

the header to allow method chaining

setZ

public DnsQueryHeader setZ(int z)

Description copied from class: DnsHeader

Sets the field Z. This field is reserved and should remain as 0 if the DNS server does not make usage of this field.

Overrides:

setZ in class DnsHeader

Parameters:

z - the value for the reserved field Z