utils

func AnswersByType ¶

func AnswersByType(msg *dns.Msg, qtype uint16) []dns.RR

AnswersByType returns only the answers from the DNS Answer section matching the provided type.

func BackoffJitter ¶

func BackoffJitter(min, max time.Duration) time.Duration

BackoffJitter returns a random Duration between the provided min and max parameters.

func ExponentialBackoff ¶

func ExponentialBackoff(events int, delay time.Duration) time.Duration

ExponentialBackoff returns a Duration equal to 2^events multiplied by the provided delay and jitter added equal to [0,delay).

func FQDNToRegistered ¶

func FQDNToRegistered(fqdn, registered string, callback func(domain string) bool)

FQDNToRegistered executes the provided callback routine for domain names, starting with the FQDN to the registered domain name, removing one label with each execution. The process stops if the callback routine returns true, indicating completion.

func QueryMsg ¶

func QueryMsg(name string, qtype uint16) *dns.Msg

QueryMsg generates a message used for a forward DNS query.

func RegisteredToFQDN ¶

func RegisteredToFQDN(registered, fqdn string, callback func(domain string) bool)

RegisteredToFQDN executes the provided callback routine for domain names, starting with the registered domain name to the FQDN, adding one label with each execution. The process stops if the callback routine returns true, indicating completion.

func RemoveLastDot ¶

func RemoveLastDot(name string) string

RemoveLastDot removes the '.' at the end of the provided FQDN.

func ReverseMsg ¶

func ReverseMsg(addr string) *dns.Msg

ReverseMsg generates a message used for a reverse DNS query.

func SetupOptions ¶

func SetupOptions() *dns.OPT

SetupOptions returns the EDNS0_SUBNET option for hiding our location.

func TCPExchange ¶

func TCPExchange(req types.Request, timeout time.Duration)

func TruncatedExponentialBackoff ¶

func TruncatedExponentialBackoff(events int, delay, max time.Duration) time.Duration

TruncatedExponentialBackoff returns a Duration equal to ExponentialBackoff with a provided maximum Duration used to truncate the result.

func WalkMsg ¶

func WalkMsg(name string, qtype uint16) *dns.Msg

WalkMsg generates a message used for a NSEC walk query.