NAME

Mail::RBL - Perl extension to access RBL-style host verification services

SYNOPSIS

  use Mail::RBL;
  my $list = new Mail::RBL('list.org');
  # You can also specify a resolver to use with Net::DNS::Resolver
  my $list = new Mail::RBL('list.org', $res);
  if ($list->check($host)) {
      print "$host is in the list";
  }
  my ($ip_result, $optional_info_txt) = $list->check($host);
  # $optional_info_txt will be undef if the list does not provide TXT
  # RRs along with the A RRs.
  print "The list says ", ($list->check($host))[1], " in its TXT RR\n";
  my ($ip_result, $optional_info_txt) = $list->check_rhsbl($hostname);

DESCRIPTION

This module eases the task of checking if a given host is in the list. The methods available are described below:

"->new(suffix, resolver)"

Creates a list handle. The "suffix" parameter is mandatory and specifies which suffix to append to the queries. If left unspecified, defaults to "bl.spamcop.net".

An optional DNS resolver can be specified. An object of the Net::DNS::Resolver(3) class is expected.

"->check($host)"

$host can be either a hostname or an IP address. In the case of an IP Address. In the case of a hostname, all the IP addresses will be looked up and checked against the list. If any of the addresses is in the list, the host will be considered in the list as a whole.

Returns either a "NetAddr::IP" object as returned by the RBL itself, or "undef" in case the RBL does not supply an answer. This is important because many lists inject some semantics on the DNS response value, which now can be recovered easily with the program that uses this module.

In array context, any IP addresses are returned, followed by any TXT RR (or undef if none). If no match is found, an empty list is returned instead. In scalar context, only the first IP address (or undef) is returned.

"->check_rhsbl($host)"

Analogous to "->check()", but queries RHSBLs instead of IP-based lists. This is useful for using lists such as some of http://www.rfc-ignorant.org/.

Results and return values are the same as "->check()".

HISTORY

  $Log: RBL.pm,v $
  Revision 1.10  2007/04/25 04:22:04  lem
  Finished adding support for the custom resolver code - Implementation
  was incomplete
  Revision 1.9  2006/12/08 00:01:14  lem
  Get version straight from the CVS revision.
  Revision 1.8  2006/12/07 23:58:07  lem
  Allow the user to provide a Net::DNS::Resolver object to perform DNS
  resolution - This allows finer control over how the queries are
  performed. Suggested by Eric Langheinrich.

1.00

Original version.

1.01

Minor bug fixes. Cleaned up MS-DOS line endings. Changed test cases (more and better tests). Now requires Test::More. More useful return values. Improved docs. First crypto-signed distribution of this module.

AUTHOR

Luis E. Munoz <luismunoz@cpan.org>

SEE ALSO

Net::DNS::Resolver(3), perl(1).