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Manual Reference Pages  -  PARANOID::NETWORK::IPV4 (3)

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NAME

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

CONTENTS

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 <B>ipv4NetConvertB> and <B>ipv4NetIntersectB> 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 <B>ipv4NetConvertB>, 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 <B>:allB> tag.

    MAXIPV4CIDR

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

    IPV4REGEX

Regular expression: <B>qr/(?:\d{1,3}\.){3}\d{1,3}/smB>

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 <B>B>$mask<B>B> will be undefined.

    IPV4BASE

This is the ordinal index of the base network address as returned by <B>ipv4NetConvertB>.

    IPV4BRDCST

This is the ordinal index of the broadcast address as returned by <B>ipv4NetConvertB>.

    IPV4MASK

This is the ordinal index of the network mask as returned by <B>ipv4NetConvertB>.

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)

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