NAME
Net::DNS::SEC::Validator - interface to libval(3) and related constants, structures and functions.SYNOPSIS
use Net::DNS::SEC::Validator;
use Net::DNS::Packet;
use Net::hostent;
use Net::addrinfo;
use Socket qw(:all);
my $validator = new Net::DNS::SEC::Validator(policy => ":");
my (@r) = $validator->getaddrinfo("good-A.test.dnssec-tools.org");
my $r = $validator->res_query("marzot.net", "IN", "MX");
my $h = $validator->gethostbyname("good-AAAA.test.dnssec-tools.org",
AF_INET6);DESCRIPTION
This Perl module is designed to implement and export functionality provided by the validating DNS resolver library, libval(3). The functions are provided through an easy-to-use object oriented interface. The interface is designed for the higher level user, hiding some of the complexity of validating resolvers. Nevertheless, application interface behavior can be customized through configuration files provided by libval(3) and extensive error codes returned.
Details of DNSSEC and associated resolver behavior may be found in the core DNSSEC RFCs (4033-4035).
INTERFACE:
A description of the API follows:
Contructor:
To create a validator object use the Net::DNS::SEC::Validator->new() method. This method optionally takes a policy label (policy => 'label'), or default to using the default label in the libval(3) dnsval.conf file.
Data Fields:
$validator->{error} =>The latest method error code
$validator->{errorStr} => the latest method error string
$validator->{valStatus} => the val_status of last call (if single)
$validator->{valStatusStr} => the val_status string of last callMethods:
$validator->getaddrinfo(<name>[,<service>[,<hints>]])
where:
<name> => is the node name or numeric address being queried
<service> => is the name or number represting the service
(note: <name> or <service> may be undef, but not both)
<hint> => a Net::addrinfo object specying flags, family, etc.returns:
An array of Net::addrinfo objects (augmented with a 'val_status'
field). On error, returns an empty array. in scalar context
returns first Net::addrinfo object, or undef on error.
$validator->gethostbyname(<name>[,<family>])
where:
<name> => is the node name or numeric address being queried
<family> => the address family of returned entry (default: AF_INET)returns:
A Net::hostent object. Validator valStatus/valStatusStr fields
will be updated. On error, undef is returned and validator object
error/errorStr fields are updated.
$validator->res_query(<name>[,<class>[,<type>]])
where:
<name> => is the node name or numeric address being queried
<class> => is the DNS class of the record being queried (default: IN)
<type> => is the DNS record type being queried (defailt A)returns:
A packed DNS query result is returned on success. This object is
suitable to be passed to the Net::DNS::Packet(\$result)
interface for parsing. Validator valStatus/valStatusStr fields
will be updated. On error, undef is returned and validator
object error/errorStr fields are updated.$validator->policy([<label>])
where:
<label> => the policy label to use (old context is destroyed)
(default: ":" dnsval.conf default policy)returns:
the policy label currently (after change) being used.
$validator->istrusted([<val_status>])
where:
<val_status> => numeric vaildator status code
(default: $validator->{valStatus})returns:
A boolean positive value if <val_status> is a trusted result.
$validator->valStatusStr([<val_status>])
where:
<val_status> => numeric vaildator status code
(default: $validator->{valStatus})returns:
A string representation of the given <val_status>.
EXAMPLES
use Net::DNS::SEC::Validator;
use Net::DNS::Packet;
use Net::hostent;
use Net::addrinfo;
use Socket qw(:all);
# construct object
my $validator = new Net::DNS::SEC::Validator(policy => ":");
# change validation policy
$validator->policy("validate_tools:");
# fetch array of Net::addrinfo objects
my (@r) = $validator->getaddrinfo("good-A.test.dnssec-tools.org");
foreach $a (@r) {
print $a->stringify, " is trusted\n"
if $validator->istrusted($a->val_status));
}
# query an MX record
my $r = $validator->res_query("marzot.net", "IN", "MX");
my ($pkt, $err) = new Net::DNS::Packet(\$r);
print ($validator->istrusted ?
"result is trusted\n" :
"result is NOT trusted\n");
my $h = $validator->gethostbyname("good-A.test.dnssec-tools.org");
if ( @{$h->addr_list}) {
my $i;
for $addr ( @{$h->addr_list} ) {
printf "\taddr #%d is [%s]\n", $i++, inet_ntoa($addr);
}
}COPYRIGHT
Copyright (c) 2006 G. S. Marzot. All rights reserved. This program
is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
Copyright (c) 2006-2008 SPARTA, Inc. All Rights Reserved. This program
is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.AUTHOR
G. S. Marzot (marz@users.sourceforge.net)