/usr/share/perl5/Mail/SPF/Mod/Exp.pm is in libmail-spf-perl 2.9.0-3.
This file is owned by root:root, with mode 0o644.
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# Mail::SPF::Mod::Exp
# SPF record "exp" modifier class.
#
# (C) 2005-2012 Julian Mehnle <julian@mehnle.net>
# 2005 Shevek <cpan@anarres.org>
# $Id: Exp.pm 57 2012-01-30 08:15:31Z julian $
#
##############################################################################
package Mail::SPF::Mod::Exp;
=head1 NAME
Mail::SPF::Mod::Exp - SPF record C<exp> modifier class
=cut
use warnings;
use strict;
use Mail::SPF::Mod;
use base 'Mail::SPF::GlobalMod';
use Error ':try';
use Mail::SPF::MacroString;
use constant TRUE => (0 == 0);
use constant FALSE => not TRUE;
use constant name => 'exp';
use constant name_pattern => qr/${\name}/i;
use constant precedence => 0.2;
=head1 DESCRIPTION
An object of class B<Mail::SPF::Mod::Exp> represents an SPF record modifier of
type C<exp>.
=head2 Constructors
The following constructors are provided:
=over
=item B<new(%options)>: returns I<Mail::SPF::Mod::Exp>
Creates a new SPF record C<exp> modifier object.
%options is a list of key/value pairs representing any of the following
options:
=over
=item B<domain_spec>
See L<Mail::SPF::Mod/new>.
=back
=item B<new_from_string($text, %options)>: returns I<Mail::SPF::Mod::Exp>;
throws I<Mail::SPF::ENothingToParse>, I<Mail::SPF::EInvalidMod>
Creates a new SPF record C<exp> modifier object by parsing the string and
any options given.
=back
=head2 Class methods
The following class methods are provided:
=over
=item B<name>: returns I<string>
Returns B<'exp'>.
=item B<name_pattern>: returns I<Regexp>
Returns a regular expression that matches a modifier name of B<'exp'>.
=item B<precedence>: returns I<real>
Returns a precedence value of B<0.2>. See L<Mail::SPF::Mod/precedence>.
=back
=head2 Instance methods
The following instance methods are provided:
=over
=cut
sub parse_params {
my ($self) = @_;
$self->parse_domain_spec(TRUE);
return;
}
=item B<params>
See L<Mail::SPF::Mod/params>.
=cut
sub params {
my ($self) = @_;
return $self->{domain_spec};
}
=item B<domain_spec>: returns I<Mail::SPF::MacroString>
Returns the C<domain-spec> parameter of the modifier.
=cut
# Make read-only accessor:
__PACKAGE__->make_accessor('domain_spec', TRUE);
=item B<process($server, $request, $result)>
If the given SPF result is a C<fail> result, retrieves the authority domain's
explanation string from the modifier's target domain and attaches it to the SPF
result. If an error occurs during the retrieval of the explanation string,
does nothing, as if the modifier was not present. See RFC 4408, 6.2, for
details.
=cut
sub process {
my ($self, $server, $request, $result) = @_;
try {
my $exp_domain = $self->{domain_spec}->new(server => $server, request => $request);
my $txt_packet = $server->dns_lookup($exp_domain, 'TXT');
my @txt_rrs = grep($_->type eq 'TXT', $txt_packet->answer);
@txt_rrs > 0
or $server->throw_result('permerror', $request,
"No authority explanation string available at domain '$exp_domain'"); # RFC 4408, 6.2/4
@txt_rrs == 1
or $server->throw_result('permerror', $request,
"Redundant authority explanation strings found at domain '$exp_domain'"); # RFC 4408, 6.2/4
my $explanation = Mail::SPF::MacroString->new(
text => join('', $txt_rrs[0]->char_str_list),
server => $server,
request => $request,
is_explanation => TRUE
);
$request->state('authority_explanation', $explanation);
}
# Ignore DNS and other errors:
catch Mail::SPF::EDNSError with {}
catch Mail::SPF::Result::Error with {};
return;
}
=back
See L<Mail::SPF::Mod> for other supported instance methods.
=head1 SEE ALSO
L<Mail::SPF>, L<Mail::SPF::Mod>, L<Mail::SPF::Term>, L<Mail::SPF::Record>
L<http://tools.ietf.org/html/rfc4408>
For availability, support, and license information, see the README file
included with Mail::SPF.
=head1 AUTHORS
Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>
=cut
TRUE;
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