Paranoid::Network::IPv6(3)

NAME
Paranoid::Network::IPv6 - IPv6-related functions

VERSION
$Id: IPv6.pm,v 0.3 2012/09/24 23:20:22 acorliss Exp $

SYNOPSIS
    use Paranoid::Network::IPv6;

    @net = ipv6NetConvert($netAddr);
    $rv = ipv6NetIntersect($net1, $net2);

or

    use Paranoid::Network::IPv6 qw(:all);

    print "Valid IP address\n" if $netAddr =~ /^@{[ IPV6REGEX ]}$/;

    @net = ipv6NetConvert($netAddr);
    $broadcast = $net[IPV6BRDCST];

    use Paranoid::Network::IPv6 qw(:ipv6Sort);

    @nets = sort ipv6StrSort    @nets;
    @nets = sort ipv6PackedSort @nets;
    @nets = sort ipv6NumSort    @nets;

DESCRIPTION
This module contains a few convenience functions for working with IPv6 addresses.

By default only ipv6NetConvert, ipv6NetPacked, and ipv4NetIntersect are imported. Other symbol sets are:

    Name        Description
    ---------------------------------------------
    all         all functions/constants
    base        default exported functions
    constants   constants
    ipv6Sort    sort functions

SUBROUTINES/METHODS

  ipv6NetConvert
    @net = ipv6NetConvert($netAddr);

This function takes an IPv4 network address in string format and converts it into and array of arrays. The arrays will contain the base network address, the broadcast address, and the netmask, each split into native 32bit integer format chunks. Each sub array is essentially what you would get from:

    @chunks = unpack 'NNNN', inet_pton(AF_INET6, '::1');

using '::1' as the sample IPv6 address.

The network address must have the netmask in CIDR format. In the case of a single IP address, the array with only have one subarray, that of the IP itself, split into 32bit integers.

Passing any argument to this function that is not a string representation of an IP address (including undef values) will cause this function to return an empty array.

  ipv6NetPacked
    @net = ipv6NetPacked('fe80::/64');

This function is a wrapper for ipv6NetConvert, but instead of subarrays each element is the packed (opaque) string as returned by inet_pton.

  ipv6NetIntersect
    $rv = ipv6NetIntersect($net1, $net2);

This function tests whether an IP or subnet intersects with another IP or subnet. The return value is essentially boolean, but the true value can vary to indicate which is a subset of the other:

    -1: destination range encompasses target range
     0: both ranges do not intersect at all
     1: target range encompasses destination range

The function handles the same string formats as ipv6NetConvert, but will allow you to test single IPs in integer format as well.

  ipv6StrSort
    @sorted = sort ipv6StrSort @nets;

This function allows IPv6 addresses and networks to be passed in string format. Networks can be in CIDR format. Sorts in ascending order. :w

  ipv6PackedSort
    @sorted = sort ipv6PackedSort @nets;

This function sorts addresses that are in packed format, such as returned by inet_pton. Sorts in ascending order.

  ipv6NumSort
    @sorted = sort ipv6NumSort @nets;

This function sorts addresses that are in unpacked, native integer format, such as one gets from:

    @ip = unpack 'NNNN', inet_pton(AF_INET6, $ipAddr);

Sorts in ascending order. List of addresses should be a list of lists.

CONSTANTS
These are only imported if explicity requested or with the :all tag.

  MAXIPV6CIDR
Simply put: 128. This is the largest CIDR notation supported in IPv6.

  IPV6REGEX
Regular expression:

                            qr/
                            :(?::[abcdef\d]{1,4}){1,7}                 |
                            [abcdef\d]{1,4}(?:::?[abcdef\d]{1,4}){1,7} |
                            (?:[abcdef\d]{1,4}:){1,7}:
                            /smix;

You can use this for validating IP addresses as such:

    $ip =~ m#^@{[ IPV6REGEX ]}$#;

or to extract potential IPs from extraneous text:

    (@ips) = ( $string =~ m#(@{[ IPV6REGEX ]})#g);

  IPV6CIDRRGX
Regular expression:

    qr#(@{[ IPV6REGEX ]})(?:/(\d+))?#sm

By default this will extract an IP or CIDR notation network address:

    ($net, $mask) = ( $ip =~ m#^@{[ IPV6CIDRRGX ]}$# );

In the case of a simple IP address $mask will be undefined.

  IPV6BASE
This is the ordinal index of the base network address as returned by ipv6NetConvert.

  IPV6BRDCST
This is the ordinal index of the broadcast address as returned by ipv6NetConvert.

  IPV6MASK
This is the ordinal index of the network mask as returned by ipv6NetConvert.

DEPENDENCIES

o   Paranoid

o   Paranoid::Network::Socket

BUGS AND LIMITATIONS

AUTHOR
Arthur Corliss (corliss@digitalmages.com)

LICENSE AND COPYRIGHT
This software is licensed under the same terms as Perl, itself. Please see http://dev.perl.org/licenses/ for more information.

(c) 2012, Arthur Corliss (corliss@digitalmages.com)