NAME

Mail::SPF::Util - Mail::SPF utility class

SYNOPSIS

use Mail::SPF::Util;

$hostname = Mail::SPF::Util->hostname;

$ipv6_address_v4mapped =
    Mail::SPF::Util->ipv4_address_to_ipv6($ipv4_address);

$ipv4_address =
    Mail::SPF::Util->ipv6_address_to_ipv4($ipv6_address_v4mapped);

$is_v4mapped =
    Mail::SPF::Util->ipv6_address_is_ipv4_mapped($ipv6_address);

$reverse_name = Mail::SPF::Util->ip_address_reverse($ip_address);

$validated_domain = Mail::SPF::Util->valid_domain_for_ip_address(
    Mail::SPF::Server->new(),
    $ip_address,
    $domain,
    $find_best_match,   # defaults to false
    $accept_any_domain  # defaults to false
);

DESCRIPTION

Mail::SPF::Util is Mail::SPF's utility class.

Class methods

The following class methods are provided:

hostname: returns string

Returns the fully qualified domain name (FQDN) of the local host.

ipv4_address_to_ipv6($ipv4_address): returns NetAddr::IP; throws Mail::SPF::EInvalidOptionValue

Converts the specified NetAddr::IP IPv4 address into an IPv4-mapped IPv6 address. Throws a Mail::SPF::EInvalidOptionValue exception if the specified IP address is not an IPv4 address.

ipv6_address_to_ipv4($ipv6_address): returns NetAddr::IP; throws Mail::SPF::EInvalidOptionValue

Converts the specified NetAddr::IP IPv4-mapped IPv6 address into a proper IPv4 address. Throws a Mail::SPF::EInvalidOptionValue exception if the specified IP address is not an IPv4-mapped IPv6 address.

ipv6_address_is_ipv4_mapped($ipv6_address): returns boolean

Returns true if the specified NetAddr::IP IPv6 address is an IPv4-mapped address, false otherwise.

ip_address_reverse($ip_address): returns string; throws Mail::SPF::EInvalidOptionValue

Returns the in-addr.arpa./ip6.arpa. reverse notation of the given NetAddr::IP IPv4 or IPv6 address. Throws a Mail::SPF::EInvalidOptionValue exception if the specified IP address is not an IPv4 or IPv6 address.

valid_domain_for_ip_address($server, $ip_address, $domain, $find_best_match = false, $accept_any_domain = false): returns string or undef

Finds a valid domain name for the given NetAddr::IP IP address that matches the given domain or a sub-domain thereof. A domain name is valid for the given IP address if the IP address reverse-maps to that domain name in DNS, and the domain name in turn forward-maps to the IP address. Uses the given Mail::SPF::Server object to perform DNS lookups. Returns the validated domain name.

If $find_best_match is true, the one domain name is selected that best matches the given domain name, preferring direct matches over sub-domain matches. Defaults to false.

If $accept_any_domain is true, any domain names are considered acceptable, even if they differ completely from the given domain name (which is then effectively unused unless a best match is requested). Defaults to false.

SEE ALSO

Mail::SPF

For availability, support, and license information, see the README file included with Mail::SPF.

AUTHORS

Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>