dnsutil

Documentation

Overview

Package dnsutil contains DNS related helper functions.

Index

• func Dedup(m *dns.Msg) *dns.Msg
• func DuplicateCNAME(r *dns.CNAME, records []dns.RR) bool
• func ExtractAddressFromReverse(reverseName string) string
• func ParseHostPort(s, defaultPort string) (string, error)
• func ParseHostPortOrFile(s ...string) ([]string, error)

Functions

func Dedup

func Dedup(m *dns.Msg) *dns.Msg

Dedup de-duplicates a message.

func DuplicateCNAME

func DuplicateCNAME(r *dns.CNAME, records []dns.RR) bool

DuplicateCNAME returns true if r already exists in records.

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 failes the empty string is returned.

func ParseHostPort

func ParseHostPort(s, defaultPort string) (string, error)

ParseHostPort will check if the host part is a valid IP address, if the IP address is valid, but no port is found, defaultPort is added.

func ParseHostPortOrFile

func ParseHostPortOrFile(s ...string) ([]string, error)

ParseHostPortOrFile parses the strings in s, each string can either be a address, address:port or a filename. The address part is checked and the filename case a resolv.conf like file is parsed and the nameserver found are returned.