NAME

       Paranoid::Network::IPv4 - IPv4-related functions

VERSION

       $Id: IPv4.pm,v 0.2 2012/09/24 22:47:01 acorliss Exp $

SYNOPSIS

           use Paranoid::Network::IPv4;

           @net = ipv4NetConvert($netAddr);
           $rv = ipv4NetIntersect($net1, $net2);

       or

           use Paranoid::Network::IPv4 qw(:all);

           print "Valid IP address\n" if $netAddr =~ /^@{[ IPV4REGEX ]}$/;

           @net = ipv4NetConvert($netAddr);
           $broadcast = $net[IPV4BRDCST];

           use Paranoid::Network::IPv4 qw(:ipv4Sort);

           @nets = sort ipv4StrSort    @nets;
           @nets = sort ipv4PackedSort @nets;
           @nets = sort ipv4NumSort    @nets;

DESCRIPTION

       This module contains a few convenience functions for working with IPv4 addresses.

       By default only ipv4NetConvert and ipv4NetIntersect are imported.  Other symbol sets are:

           Name        Description
           ---------------------------------------------
           all         all functions/constants
           base        default exported functions
           constants   constants
           ipv4Sort    sort functions

SUBROUTINES/METHODS

   ipv4NetConvert
           @net = ipv4NetConvert($netAddr);

       This function takes an IPv4 network address in string format and converts it into an array
       containing the base network address, the broadcast address, and the netmask, in integer
       format.  The network address can have the netmask in either CIDR format or dotted quads.

       In the case of a single IP address, the array with only have one element, that of the IP
       in integer format.

       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.

   ipv4NetIntersect
           $rv = ipv4NetIntersect($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 ipv4NetConvert, but will allow you to test
       single IPs in integer format as well.

   ipv4StrSort
           @sorted = sort ipv4StrSort @nets;

       This function allows IPv4 addresses and networks to be passed in string format.  Networks
       can be in CIDR format.  Sorts in ascending order.

   ipv4PackedSort
           @sorted = sort ipv4PackedSort @nets;

       This function sorts IPv4 addresses as returned by inet_aton.  Sorts in ascending order.

   ipv4NumSort
           @sorted = sort ipv4NumSort @nets;

       This function is rather pointless, but is included merely for completeness.  Addresses are
       in unpacked, native integer format, such as one gets from:

           $ip = unpack 'N', inet_aton($ipAddr);

       Sorts in ascending order.

CONSTANTS

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

   MAXIPV4CIDR
       Simply put: 32.  This is the largest CIDR notation supported in IPv4.

   IPV4REGEX
       Regular expression: qr/(?:\d{1,3}\.){3}\d{1,3}/sm

       You can use this for validating IP addresses as such:

           $ip =~ m#^@{[ IPV4REGEX ]}$#;

       or to extract potential IPs from  extraneous text:

           (@ips) = ( $string =~ m#(@{[ IPV4REGEX ]})#gsm);

   IPV4CIDRRGX
       Regular expression:

           qr#(@{[ IPV4REGEX ]})(?:/(\d+|@{[ IPV4REGEX ]}))?#sm

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

           ($net, $mask) = ( $ip =~ m#^@{[ IPV4CIDRRGX ]}$# );

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

   IPV4BASE
       This is the ordinal index of the base network address as returned by ipv4NetConvert.

   IPV4BRDCST
       This is the ordinal index of the broadcast address as returned by ipv4NetConvert.

   IPV4MASK
       This is the ordinal index of the network mask as returned by ipv4NetConvert.

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)