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Mail::SPF::Mech(3pm)  User Contributed Perl Documentation Mail::SPF::Mech(3pm)



NAME
       Mail::SPF::Mech - SPF record mechanism base class

DESCRIPTION
       An object of class Mail::SPF::Mech represents a mechanism within an SPF
       record.  Mail::SPF::Mech cannot be instantiated directly.  Create an
       instance of a concrete sub-class instead.

       Constructors

       The following constructors are provided:

       new(%options): returns Mail::SPF::Mech
           Abstract.  Creates a new SPF record mechanism object.

           %options is a list of key/value pairs representing any of the fol-
           lowing options:

           text
               A string denoting the unparsed text of the mechanism.

           qualifier
               A single-character string denoting the qualifier of the mecha-
               nism.  Any of the following may be specified: '+' ("Pass"), '-'
               ("Fail"), '~' ("SoftFail"), '?' ("Neutral").  See RFC 4408,
               4.6.2 and 2.5, for their meanings.  Defaults to '+'.

           name
               A string denoting the name of the mechanism.  Required if a
               generic Mail::SPF::Mech object (as opposed to a specific
               sub-class) is being constructed.

           ip_network
               A NetAddr::IP object denoting an optional IP address network
               parameter of the mechanism.  Can be either an IPv4 or an IPv6
               address, with an optional network prefix length.  IPv4-mapped
               IPv6 addresses (e.g. '::ffff:192.168.0.1') must not be speci-
               fied directly, but as plain IPv4 addresses.

           domain_spec
               Either a plain string or a Mail::SPF::MacroString object denot-
               ing an optional "domain-spec" parameter of the mechanism.

           ipv4_prefix_length
           ipv6_prefix_length
               A string denoting an optional IPv4 or IPv6 network prefix
               length for the "domain_spec" of the mechanism.  Note that these
               options do not apply to the "ip_network" option, which already
               includes an optional network prefix length.

           Other options may be specified by sub-classes of Mail::SPF::Mech.

       new_from_string($text): returns Mail::SPF::Mech; throws
       Mail::SPF::ENothingToParse, Mail::SPF::EInvalidMech
           Abstract.  Creates a new SPF record mechanism object by parsing the
           given string.

       Class methods

       The following class methods are provided:

       default_qualifier: returns string
           Returns the default qualifier, i.e. '+'.

       default_ipv4_prefix_length: returns integer
           Returns the default IPv4 network prefix length, i.e. 32.

       default_ipv6_prefix_length: returns integer
           Returns the default IPv6 network prefix length, i.e. 128.

       qualifier_pattern: returns Regexp
           Returns a regular expression that matches any legal mechanism qual-
           ifier, i.e. '+', '-', '~', or '?'.

       name_pattern: returns Regexp
           Returns a regular expression that matches any legal mechanism name.

       Instance methods

       The following instance methods are provided:

       text: returns string; throws Mail::SPF::ENoUnparsedText
           Returns the unparsed text of the mechanism.  Throws a
           Mail::SPF::ENoUnparsedText exception if the mechanism was created
           synthetically instead of being parsed, and no text was provided.

       qualifier: returns string
           Returns the qualifier of the mechanism.  See the description of the
           "new" constructor's "qualifier" option.

       name: returns string
           Returns the name of the mechanism.

       params: returns string
           Abstract.  Returns the mechanism's parameters formatted as a
           string.

           A sub-class of Mail::SPF::Mech does not have to implement this
           method if it supports no parameters.

       stringify: returns string
           Formats the mechanism's qualifier, name, and parameters as a string
           and returns it.  (A qualifier that matches the default of '+' is
           omitted.)  You can simply use a Mail::SPF::Mech object as a string
           for the same effect, see "OVERLOADING".

       domain($server, $request): returns string
           Returns the target domain of the mechanism.  Depending on whether
           the mechanism does have an explicit "domain_spec" parameter, this
           is either the macro-expanded "domain_spec" parameter, or the
           request's authority domain (see "authority_domain" in
           Mail::SPF::Request) otherwise.  Both a Mail::SPF::Server and a
           Mail::SPF::Request object are required for resolving the target
           domain.

       match($server, $request): returns boolean; throws
       Mail::SPF::Result::Error
           Abstract.  Checks whether the mechanism matches the parameters of
           the given request (see Mail::SPF::Request) and returns true if it
           does, or false otherwise.  In any case, takes both a
           Mail::SPF::Server and a Mail::SPF::Request object.

           This method is abstract and must be implemented by sub-classes of
           Mail::SPF::Mech.

       match_in_domain($server, $request): returns boolean; throws
       Mail::SPF::Result::Error
       match_in_domain($server, $request, $domain): returns boolean; throws
       Mail::SPF::Result::Error
           Checks whether the mechanism's target domain name (that is, any of
           its DNS "A" or "AAAA" records) matches the given request's IP
           address (see "ip_address" in Mail::SPF::Request), and returns true
           if it does, or false otherwise.  If an explicit domain is speci-
           fied, it is used instead of the mechanism's target domain.  The
           mechanism's IP network prefix lengths are respected when matching
           DNS address records against the request's IP address.  See RFC
           4408, 5, for the exact algorithm used.

           This method exists mainly for the convenience of sub-classes of
           Mail::SPF::Mech.

       explain($server, $request, $result)
           Locally generates an explanation for why the mechanism caused the
           given result, and stores it in the given request object's state.

           There is no need to override this method in sub-classes.  See the
           "explanation_template" method.

       explanation_template($server, $request, $result): returns string
           Returns a macro string template for a locally generated explanation
           for why the mechanism caused the given result.

           Sub-classes should either define an "explanation_tem-
           plates_by_result_code" hash constant with their own templates, or
           override this method.

OVERLOADING
       If a Mail::SPF::Mech object is used as a string, the "stringify" method
       is used to convert the object into a string.

SEE ALSO
       Mail::SPF::Mech::All, Mail::SPF::Mech::IP4, Mail::SPF::Mech::IP6,
       Mail::SPF::Mech::A, Mail::SPF::Mech::MX, Mail::SPF::Mech::PTR,
       Mail::SPF::Mech::Exists, Mail::SPF::Mech::Include

       Mail::SPF, Mail::SPF::Record, Mail::SPF::Term

       <http://www.ietf.org/rfc/rfc4408.txt>;

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

AUTHORS
       Julian Mehnle <julianATmehnle.net>, Shevek <cpanATanarres.org>



perl v5.8.8                       2007-10-07              Mail::SPF::Mech(3pm)