coredns

type Msg struct {
	MsgHdr
	Compress bool `json:"-"`
	Question []Question
	Answer   []RR
	Ns       []RR
	Extra    []RR
}

type MsgHdr struct {
	Id                 uint16
	Response           bool
	Opcode             int
	Authoritative      bool
	Truncated          bool
	RecursionDesired   bool
	RecursionAvailable bool
	Zero               bool
	AuthenticatedData  bool
	CheckingDisabled   bool
	Rcode              int
}

type Question struct {
	Name   string `dns:"cdomain-name"`
	Qtype  uint16
	Qclass uint16
}

type RR interface {
	Header() *RR_Header
	String() string
}

type RR_Header struct {
	Name     string `dns:"cdomain-name"`
	Rrtype   uint16
	Class    uint16
	Ttl      uint32
	Rdlength uint16
}

type Request struct {
	Req  *Msg
	W    ResponseWriter
	Zone string
}

type ResponseWriter interface {
	LocalAddr() net.Addr
	RemoteAddr() net.Addr
	WriteMsg(*Msg) error
	Write([]byte) (int, error)
	Close() error
	TsigStatus() error
	TsigTimersOnly(bool)
	Hijack()
}