dnsutil

Documentation

Index

• Constants
• func ClearDNSSEC(msg *dns.Msg) *dns.Msg
• func ClearOPT(msg *dns.Msg) *dns.Msg
• func ExchangeInternal(ctx context.Context, r *dns.Msg) (*dns.Msg, error)
• func ExtractAddressFromReverse(reverseName string) string
• func GenerateServerCookie(secret, remoteip, cookie string) string
• func HandleFailed(req *dns.Msg, rcode int, do bool) *dns.Msg
• 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)

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 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 HandleFailed

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

HandleFailed returns message specified with rcode.

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