/usr/share/perl5/Mail/Verify.pm is in libmail-verify-perl 0.02-5.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | # Mail::Verify.pm
# $Id: Verify.pm,v 1.4 2002/06/09 15:42:32 petef Exp $
# Copyright (c) 2001 Pete Fritchman <petef@databits.net>. All rights
# reserved. This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
package Mail::Verify;
=head1 NAME
Mail::Verify - Utility to verify an email address
=head1 SYNOPSIS
use Mail::Verify;
=head1 DESCRIPTION
C<Mail::Verify> provides a function CheckAddress function for verifying email
addresses. First the syntax of the email address is checked, then it verifies
that there is at least one valid MX server accepting email for the domain. Using
L<Net::DNS> and L<IO::Socket> a list of MX records (or, falling back on a hosts
A record) are checked to make sure at least one SMTP server is accepting
connections.
=head1 ERRORS
Here are a list of return codes and what they mean:
=item 0
The email address appears to be valid.
=item 1
No email address was supplied.
=item 2
There is a syntaxical error in the email address.
=item 3
There are no DNS entries for the host in question (no MX records or A records).
=item 4
There are no live SMTP servers accepting connections for this email address.
=head1 EXAMPLES
This example shows obtaining an email address from a form field and verifying
it.
use CGI qw/:standard/;
use Mail::Verify;
my $q = new CGI;
[...]
my $email = $q->param("emailaddr");
my $email_ck = Mail::Verify::CheckAddress( $email );
if( $email_ck ) {
print '<h1>Form input error: Invalid email address.</h1>';
}
[...]
=cut
use strict;
use IO::Socket;
use Net::DNS;
my $VERSION = "0.02";
my $DEBUG = "0";
sub Version { $VERSION }
sub CheckAddress {
my $addr = shift;
return 1 unless $addr;
my ($rr, @mxhosts, @mxrr, $resolver, $dnsquery, $livesmtp, $mx);
my ($testsmtp);
# First, we check the basic syntax of the email address.
my ($user, $domain, $extra);
($user, $domain, $extra) = split /\@/, $addr;
return 2 if $extra;
@mxrr = Net::DNS::mx( $domain );
# Get the A record for each MX RR
foreach $rr ( @mxrr ) {
push( @mxhosts, $rr->exchange );
}
if( ! @mxhosts ) { # check for an A record...
$resolver = new Net::DNS::Resolver;
$dnsquery = $resolver->search( $domain );
return 3 unless $dnsquery;
foreach $rr ($dnsquery->answer) {
next unless $rr->type eq "A";
push( @mxhosts, $rr->address );
}
return 3 unless @mxhosts;
}
# DEBUG: see what's in @mxhosts
if( $DEBUG ) {
foreach( @mxhosts ) {
$mx = $_;
print STDERR "\@mxhosts -> $mx\n";
}
}
# make sure we have a living smtp server on at least one of @mxhosts
$livesmtp = 0;
foreach $mx (@mxhosts) {
$testsmtp = IO::Socket::INET->new( Proto=>"tcp",
PeerAddr=> $mx,
PeerPort=> 25,
Timeout => 10
);
if( $testsmtp ) {
$livesmtp = 1;
close $testsmtp;
}
}
if( ! $livesmtp ) {
return 4;
}
return 0;
}
1;
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