request

Documentation

Overview

Package request abstracts a client's request so that all plugins will handle them in an unified way.

Index

• func Proto(w dns.ResponseWriter) string
• type Request
  • func (r *Request) Class() string
  • func (r *Request) Clear()
  • func (r *Request) Do() bool
  • func (r *Request) ErrorMessage(rcode int) *dns.Msg
  • func (r *Request) Family() int
  • func (r *Request) IP() string
  • func (r *Request) Len() int
  • func (r *Request) Name() string
  • func (r *Request) NewWithQuestion(name string, typ uint16) Request
  • func (r *Request) Port() string
  • func (r *Request) Proto() string
  • func (r *Request) QClass() uint16
  • func (r *Request) QName() string
  • func (r *Request) QType() uint16
  • func (r *Request) RemoteAddr() string
  • func (r *Request) Scrub(reply *dns.Msg) (*dns.Msg, Result)
  • func (r *Request) Size() int
  • func (r *Request) SizeAndDo(m *dns.Msg) bool
  • func (r *Request) Type() string
• type Result

Functions

func Proto

func Proto(w dns.ResponseWriter) string

Proto gets the protocol used as the transport. This will be udp or tcp.

Types

type Request

type Request struct {
	Req *dns.Msg
	W   dns.ResponseWriter

	// Optional lowercased zone of this query.
	Zone string

	Context context.Context
	// contains filtered or unexported fields
}

Request contains some connection state and is useful in plugin.

func (*Request) Class

func (r *Request) Class() string

Class returns the class of the question in the request. If the request is malformed the empty string is returned.

func (*Request) Clear

func (r *Request) Clear()

Clear clears all caching from Request s.

func (*Request) Do

func (r *Request) Do() bool

Do returns if the request has the DO (DNSSEC OK) bit set.

func (*Request) ErrorMessage

func (r *Request) ErrorMessage(rcode int) *dns.Msg

ErrorMessage returns an error message suitable for sending back to the client.

func (*Request) Family

func (r *Request) Family() int

Family returns the family of the transport, 1 for IPv4 and 2 for IPv6.

func (*Request) IP

func (r *Request) IP() string

IP gets the (remote) IP address of the client making the request.

func (*Request) Len

func (r *Request) Len() int

Len returns the length in bytes in the request.

func (*Request) Name

func (r *Request) Name() string

Name returns the name of the question in the request. Note this name will always have a closing dot and will be lower cased. After a call Name the value will be cached. To clear this caching call Clear. If the request is malformed the root zone is returned.

func (*Request) NewWithQuestion

func (r *Request) NewWithQuestion(name string, typ uint16) Request

NewWithQuestion returns a new request based on the old, but with a new question section in the request.

func (*Request) Port

func (r *Request) Port() string

Port gets the (remote) Port of the client making the request.

func (*Request) Proto

func (r *Request) Proto() string

Proto gets the protocol used as the transport. This will be udp or tcp.

func (*Request) QClass

func (r *Request) QClass() uint16

QClass returns the class of the question in the request. If the request is malformed 0 returned.

func (*Request) QName

func (r *Request) QName() string

QName returns the name of the question in the request. If the request is malformed the root zone is returned.

func (*Request) QType

func (r *Request) QType() uint16

QType returns the type of the question as an uint16. If the request is malformed 0 is returned.

func (*Request) RemoteAddr

func (r *Request) RemoteAddr() string

RemoteAddr returns the net.Addr of the client that sent the current request.

func (*Request) Scrub

func (r *Request) Scrub(reply *dns.Msg) (*dns.Msg, Result)

Scrub scrubs the reply message so that it will fit the client's buffer. It sets reply.Compress to true. Scrub uses binary search to find a save cut off point in the additional section. If even *without* the additional section the reply still doesn't fit we repeat this process for the answer section. If we scrub the answer section we set the TC bit on the reply; indicating the client should retry over TCP. Note, the TC bit will be set regardless of protocol, even TCP message will get the bit, the client should then retry with pigeons.

func (*Request) Size

func (r *Request) Size() int

Size returns if buffer size *advertised* in the requests OPT record. Or when the request was over TCP, we return the maximum allowed size of 64K.

func (*Request) SizeAndDo

func (r *Request) SizeAndDo(m *dns.Msg) bool

SizeAndDo adds an OPT record that the reflects the intent from request. The returned bool indicated if an record was found and normalised.

func (*Request) Type

func (r *Request) Type() string

Type returns the type of the question as a string. If the request is malformed the empty string is returned.

type Result

type Result int

Result is the result of Scrub.

const (
	// ScrubIgnored is returned when Scrub did nothing to the message.
	ScrubIgnored Result = iota
	// ScrubExtra is returned when the reply has been scrubbed by removing RRs from the additional section.
	ScrubExtra
	// ScrubAnswer is returned when the reply has been scrubbed by removing RRs from the answer section.
	ScrubAnswer
)