Class OPTRecord

An extension mechanism for DNS (EDNS(0)).

Inheritance
Object
DnsObject
ResourceRecord
OPTRecord
Inherited Members
Namespace: Makaretu.Dns
Assembly: Makaretu.Dns.dll
Syntax
public class OPTRecord : ResourceRecord, IWireSerialiser, ICloneable, IPresentationSerialiser
Remarks

An OPT record does not carry any DNS data. It is used only to contain control information pertaining to the question-and-answer sequence of a specific transaction. OPT RRs MUST NOT be cached, forwarded, or stored in or loaded from master files.

The OPTRecord can be present in the AdditionalRecords section.

note

The Class property is repurposed to specify the requestor's payload size.

note

The TTL property is repurposed to specify the Opcode8, Version and DO properties.

Constructors

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OPTRecord()

Creates a new instance of the OPTRecord class.

Declaration
public OPTRecord()

Properties

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DO

The DNSSEC OK bit as defined by RFC3225.

Declaration
public bool DO { get; set; }
Property Value
Type Description
Boolean

Defaults to false.
Remarks

The TTL property is repurposed to specify the version.

See Also
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Opcode8

The most significant 8 bits of the opcode.

Declaration
public byte Opcode8 { get; set; }
Property Value
Type Description
Byte

Defaults to zero.
Remarks

The TTL property is repurposed to specify the opcode's most significant bits.

See Also
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Options

The extended DNS options.

Declaration
public List<EdnsOption> Options { get; set; }
Property Value
Type Description
List<EdnsOption>

The EDNS option sequence.
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RequestorPayloadSize

The maximimum packet size that can be received by the requestor.

Declaration
public ushort RequestorPayloadSize { get; set; }
Property Value
Type Description
UInt16

Specified in number of bytes. Defaults to 1280, which is reasonable over Ethernet.
Remarks

The Class property is repurposed to specify the requestor's payload size.

See Also
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Version

The EDNS version.

Declaration
public byte Version { get; set; }
Property Value
Type Description
Byte

Defaults to zero.
Remarks

The TTL property is repurposed to specify the version.

Methods

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ReadData(WireReader, Int32)

Read the data that is specific to the resource record Type.

Declaration
public override void ReadData(WireReader reader, int length)
Parameters
Type Name Description
WireReader reader

The source of the resource record's data.
Int32 length

The length, in bytes, of the data.
Overrides
Remarks

Derived classes must implement this method.

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ToString()

Returns the textual representation.

Declaration
public override string ToString()
Returns
Type Description
String

The presentation format of this resource record.

Overrides
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WriteData(WireWriter)

Write the data that is specific to the resource record Type.

Declaration
public override void WriteData(WireWriter writer)
Parameters
Type Name Description
WireWriter writer

The destination for the DNS object's data.
Overrides
Remarks

Derived classes must implement this method.

Implements

See Also