NAME

IPv6::Address - IPv6 Address Manipulation Library

VERSION

version 0.208

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SYNOPSIS

use IPv6::Address;

my $ipv6 = IPv6::Address->new('2001:648:2000::/48');

$ipv6->contains('2001:648:2000::/64'); #true

say $ipv6->to_string;
say $ipv6->string; # Same as previous
say $ipv6; # Same as previous

say $ipv6->string(nocompress=>1); # do not compress using the :: notation
say $ipv6->string(ipv4=>1); #print the last 32 bits as an IPv4 address

$ipv6->addr_string; # Returns '2001:648:2000::'

$ipv6->split(4); # Split the prefix into 2^4 smaller prefixes. Returns a list.  

$ipv6->apply_mask; # Apply the mask to the address. All bits beyond the mask length become 0.

$ipv6->first_address;

$ipv6->last_address;

$a->enumerate_with_offset( 5 , 64 ); #returns 2001:648:2000:4::/64 

DESCRIPTION

A pure Perl IPv6 address manipulation library. Emphasis on manipulation of prefixes and addresses. Very easy to understand and modify. The internal representation of an IPv6::Address is a blessed hash with two keys, a prefix length (0-128 obviously) and a 128-bit string. A multitude of methods to do various tasks is provided.

Methods

• new( ipv6_string )

  Takes a string representation of an IPv6 address and creates a corresponding IPv6::Address object.

• raw_new( bitstr, length )

  Creates a new IPv6::Address out of a bitstring and a prefix length. The bitstring must be binary, please do not use a '0' or '1' character string.

• get_bitstr

  Returns the bitstr of the object.

• get_prefixlen

  Returns the prefix length of the address.

• get_mask_bitstr(length)

  Returns a 128-bit string with the first prefix-length bits equal to 1, rest equal to 0. Essentially takes the prefix length of the object and returns a corresponding bit mask.

• get_masked_address_bitstr

  Returns the bitstring, after zeroing out all the bits after the prefix length. Essentially applies the prefix mask to the address.

• generate_bitstr( number )

  Not a method, returns 128-bit string, first n-items are 1, rest is 0.

• bitstr_and( bitstr1 , bitstr2 )

  Not a method, AND's two bitstrings, returns result.

• bitstr_or( bitstr1 , bitstr2)

  Not a method, OR's two bitstrings, returns result.

• bitstr_not( bitstr )

  Not a method, inverts a bitstring.

• from_str( string_bitstring )

  Not a method, takes a string of characters 0 or 1, returns corresponding binary bitstring. Please do not use more than 128 characters, rest will be ignored.

• to_str( bitstring )

  Not a method, takes a binary bitstring, returns a string composed of 0's and 1's. Please supply bitstrings of max. 128 bits, rest of the bits will be ignored.

• contains( other_address )

  This method takes an argument which is either an IPv6::Address or a plain string that can be promoted to a valid IPv6::Address, and tests whether the object contains it. Obviously returns true or false.

• addr_string

  Returns the address part of the IPv6::Address. Using the option ipv4=>1 like

    $a->addr_string(ipv4=>1) 
  

  will make the last 32-bits appear as an IPv4 address. Also, using nocompress=>1 like

    $a->addr_string( nocompress => 1 ) 
  

  will prevent the string from containing a '::' part. So it will be 8 parts separated by ':' colons.

• string

  Returns the full IPv6 address, with the prefix in its end.

• to_string

  Used internally by the overload module.

• split( exponent , target_length )

  Splits the address to the order of two of the number given as first argument. Example: if argument is 3, 2^3=8, address is split into 8 parts. The final parts have prefix length equal to the target_length specified in the second argument.

• apply_mask

  Applies the prefix length mask to the address. Does not return anything. Works on $self. **WARNING:**This will alter the object.

• first_address

  Returns the first address of the prefix that is represented by the object. E.g. consider 2001:648:2000::1234/64. First address will be 2001:648:2000::/64.

• last_address

  Returns the last address of the prefix that is represented by the object. E.g. consider 2001:648:2000::1234/64. Last address will be 2001:648:2000::ffff:ffff:ffff:ffff/64.

• is_unspecified , is_loopback , is_multicast

  Returns true or false depending on whether the address falls into the corresponding category stated by the method name. E.g.

    IPv6::Address->new('::1')->is_loopback # returns true
  

• ipv4_to_binarray

  Not a method, takes an IPv4 address, returns a character string consisting of 32 characters that are 0 or 1. Used internally, not too useful for the end user.

• enumerate_with_IPv4( ipv4, mask )

  Takes an IPv4 address and uses a part of it to enumerate inside the Ipv6 prefix of the object. E.g.

    IPv6::Address->new('2001:648:2001::/48')->enumerate_with_IPv4('0.0.0.1',0x0000ffff) #will yield 2001:648::2001:0001::/64
  

  The return value will be a new IPv6::Address object, so the original object remains intact. The part that will be used as an offset is extracted from the ipv4 by using the mask.

• enumerate_with_offset( offset, desired_length )

  Takes a non-negative integer offset and returns a prefix whose relative position inside the object is defined by the offset. The prefix length of the result is defined by the second argument. E.g.

    IPv6::Address->new('2001:648:2000::/48')->enumerate_with_offset( 5 , 64 ) #2001:648:2000:4::/64
  

• increment( offset )

  Increments the IPv6::Address object by offset. Offsets larger than 2^32-1 are not acceptable. This method is probably not too useful, but is provided for completeness.

• nxx_parts(unpack_format)

  Takes the bitstring of the address and unpacks it using the first argument. Internal use mostly.

• n16_parts

  Splits the address into an 8-item array of unsigned short integers. Network byte order is implied, a short integer is 16-bits long.

• n16_parts

  Splits the address into an 4-item array of unsigned long integers. Network byte order is implied, a long integer is 32-bits long.

• n_cmp( a , b )

  Takes two 128-bit bitstr arguments, compares them and returns the result as -1, 0 or 1. The semantics are the same as that of the spaceship operator <=>.

  This method will overload the <=> operator for IPv6::Address objects, so comparing IPv6::Address objects like they were integers produces the correct results.

• n_sort( array )

  Sorts an array of bitstrs using the n_cmp function.

• radius_string

  Returns a string suitable to be returned as an IPv6 Radius AV-pair. See RFC 3162 for an explanation of the format.

AUTHOR

Athanasios Douitsis <aduitsis@cpan.org>

SUPPORT

Please open a ticket at https://github.com/aduitsis/IPv6-Address.

COPYRIGHT & LICENSE

Copyright 2008-2015 Athanasios Douitsis, all rights reserved.

This program is free software; you can use it under the terms of Artistic License 2.0 which can be found at http://www.perlfoundation.org/artistic\_license\_2\_0