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);

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

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

    $sanitized_string = Mail::SPF::Util->sanitize_string($string);

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

Returns the given NetAddr::IP IPv4 or IPv6 address compactly formatted as a string. For IPv4 addresses, this is equivalent to calling NetAddr::IP's "addr" method. For IPv6 addresses, this is equivalent to calling NetAddr::IP's "short" method. Throws a Mail::SPF::EInvalidOptionValue exception if the specified object is not a NetAddr::IP IPv4 or IPv6 address object.

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 object is not a NetAddr::IP IPv4 or IPv6 address object.

valid_domain_for_ip_address($server, $request, $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 and Mail::SPF::Request objects to perform DNS look-ups. 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.

sanitize_string($string): returns string or undef

Replaces all non-printable or non-ascii characters in a string with their hex-escaped representation (e.g., "\x00").

AUTHORS

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

POD ERRORS

Hey! The above document had some coding errors, which are explained below: