dnsutil

Documentation

Index

• Constants
• func ClearDNSSEC(msg *dns.Msg) *dns.Msg
• func ClearOPT(msg *dns.Msg) *dns.Msg
• func Exchange(ctx context.Context, req *dns.Msg, addr string, net string) (*dns.Msg, error)
• func ExchangeInternal(ctx context.Context, r *dns.Msg) (*dns.Msg, error)
• func ExtractAddressFromReverse(reverseName string) string
• func GenerateServerCookie(secret, remoteip, cookie string) string
• func IsReverse(name string) int
• func MinimalTTL(m *dns.Msg, mt response.Type) time.Duration
• func NotSupported(w dns.ResponseWriter, req *dns.Msg) error
• func ParsePurgeQuestion(req *dns.Msg) (qname string, qtype uint16, ok bool)
• func SetEdns0(req *dns.Msg) (*dns.OPT, int, string, bool, bool)
• func SetRcode(req *dns.Msg, rcode int, do bool) *dns.Msg

Constants

const (
	// IP4arpa is the reverse tree suffix for v4 IP addresses.
	IP4arpa = ".in-addr.arpa."
	// IP6arpa is the reverse tree suffix for v6 IP addresses.
	IP6arpa = ".ip6.arpa."
	// DefaultMsgSize EDNS0 message size
	DefaultMsgSize = 1232
)

const (
	// MinimalDefaultTTL is the absolute lowest TTL.
	MinimalDefaultTTL = 5 * time.Second
	// MaximumDefaulTTL is the maximum TTL.
	MaximumDefaulTTL = 24 * time.Hour
)

Functions

func ClearDNSSEC

func ClearDNSSEC(msg *dns.Msg) *dns.Msg

ClearDNSSEC returns cleared RRSIG and NSECx message

func ClearOPT

func ClearOPT(msg *dns.Msg) *dns.Msg

ClearOPT returns cleared opt message

func Exchange

func Exchange(ctx context.Context, req *dns.Msg, addr string, net string) (*dns.Msg, error)

Exchange exchange dns request with TCP fallback

func ExchangeInternal

func ExchangeInternal(ctx context.Context, r *dns.Msg) (*dns.Msg, error)

ExchangeInternal exchange dns request internal

func ExtractAddressFromReverse

func ExtractAddressFromReverse(reverseName string) string

ExtractAddressFromReverse turns a standard PTR reverse record name into an IP address. This works for ipv4 or ipv6.

54.119.58.176.in-addr.arpa. becomes 176.58.119.54. If the conversion fails the empty string is returned.

func GenerateServerCookie

func GenerateServerCookie(secret, remoteip, cookie string) string

GenerateServerCookie return generated edns server cookie

func IsReverse

func IsReverse(name string) int

IsReverse returns 0 is name is not in a reverse zone. Anything > 0 indicates name is in a reverse zone. The returned integer will be 1 for in-addr.arpa. (IPv4) and 2 for ip6.arpa. (IPv6).

func MinimalTTL

func MinimalTTL(m *dns.Msg, mt response.Type) time.Duration

MinimalTTL scans the message returns the lowest TTL found taking into the response.Type of the message.

func NotSupported

func NotSupported(w dns.ResponseWriter, req *dns.Msg) error

NotSupported response to writer a empty notimplemented message

func ParsePurgeQuestion

func ParsePurgeQuestion(req *dns.Msg) (qname string, qtype uint16, ok bool)

ParsePurgeQuestion can parse query for purge questions

func SetEdns0

func SetEdns0(req *dns.Msg) (*dns.OPT, int, string, bool, bool)

SetEdns0 returns replaced or new opt rr and if request has do

func SetRcode

func SetRcode(req *dns.Msg, rcode int, do bool) *dns.Msg

SetRcode returns message specified with rcode.