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
|
#!/usr/bin/perl
use strict;
use warnings;
my $VERSION = (qw$LastChangedRevision: 1944 $)[1];
=head1 NAME
find_zonecut - Find zonecut for a domain name
=head1 SYNOPSIS
find_zonecut name
=head1 DESCRIPTION
B<find_zonecut> returns the name of the closest delegation point
to the specified domain name.
=cut
use Net::DNS;
print find_zonecut(shift), "\n";
sub find_zonecut {
my $name = shift;
require Net::DNS::Resolver::Recurse;
my $resolver = Net::DNS::Resolver::Recurse->new();
my $response = $resolver->send( $name, 'NULL' ) || die $resolver->errorstring;
my ($cut) = map { $_->name } $response->authority;
return $cut || die "failed to find zone cut for $name";
}
__END__
=head1 COPYRIGHT
(c)2014 Dick Franks E<lt>rwfranks[...]acm.orgE<gt>
All rights reserved.
FOR DEMONSTRATION PURPOSES ONLY, NO WARRANTY, NO SUPPORT
=head1 SEE ALSO
L<perl>, L<Net::DNS>
=cut
|
