dnsutil

Documentation

Overview

Package dnsutil copied from coredns project https://github.com/coredns/coredns/blob/master/plugin/pkg/dnsutil/reverse.go

Index

• Constants
• func ExtractAddressFromReverse(reverseName string) string
• func IsReverse(name string) int
• func Reverse(ip net.IP) (arpa string)

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."
)

Functions

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 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 Reverse

func Reverse(ip net.IP) (arpa string)

Reverse takes an IPv4 or IPv6 address and returns the matching ARPA record.