NetAddr::IP::UtilPP (3)

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Standard preamble:
========================================================================

(The comments found at the beginning of the groff file "man3/NetAddr::IP::UtilPP.3pm".)

NAME

NetAddr::IP::UtilPP -- pure Perl functions for NetAddr::IP::Util

SYNOPSIS

  use NetAddr::IP::UtilPP qw(
        hasbits
        shiftleft
        addconst
        add128
        sub128
        notcontiguous
        ipv4to6
        mask4to6
        ipanyto6
        maskanyto6
        ipv6to4
        bin2bcd
        bcd2bin
  );

  use NetAddr::IP::UtilPP qw(:all)

  $rv = hasbits($bits128);
  $bitsX2 = shiftleft($bits128,$n);
  $carry = addconst($ipv6naddr,$signed_32con);
  ($carry,$ipv6naddr)=addconst($ipv6naddr,$signed_32con);
  $carry = add128($ipv6naddr1,$ipv6naddr2);
  ($carry,$ipv6naddr)=add128($ipv6naddr1,$ipv6naddr2);
  $carry = sub128($ipv6naddr1,$ipv6naddr2);
  ($spurious,$cidr) = notcontiguous($mask128);
  ($carry,$ipv6naddr)=sub128($ipv6naddr1,$ipv6naddr2);
  $ipv6naddr = ipv4to6($netaddr);
  $ipv6naddr = mask4to6($netaddr);
  $ipv6naddr = ipanyto6($netaddr);
  $ipv6naddr = maskanyto6($netaddr);
  $netaddr = ipv6to4($pv6naddr);
  $bcdtext = bin2bcd($bits128);
  $bits128 = bcd2bin($bcdtxt);

DESCRIPTION

NetAddr::IP::UtilPP provides pure Perl functions for NetAddr::IP::Util

*

$rv = hasbits($bits128);

This function returns true if there are one's present in the 128 bit string and false if all the bits are zero.

  i.e.  if (hasbits($bits128)) {
          &do_something;
        }

  or    if (hasbits($bits128 & $mask128) {
          &do_something;
        }

This allows the implementation of logical functions of the form of:

        if ($bits128 & $mask128) {
            ...

  input:        128 bit IPv6 string
  returns:      true if any bits are present

*

$bitsXn = shiftleft($bits128,$n);

  input:        128 bit string variable,
                number of shifts [optional]
  returns:      bits X n shifts

  NOTE: input bits are returned
        if $n is not specified

*

addconst($ipv6naddr,$signed_32con);

Add a signed constant to a 128 bit string variable.

  input:        128 bit IPv6 string,
                signed 32 bit integer
  returns:  scalar      carry
            array       (carry, result)

*

add128($ipv6naddr1,$ipv6naddr2);

Add two 128 bit string variables.

  input:        128 bit string var1,
                128 bit string var2
  returns:  scalar      carry
            array       (carry, result)

*

sub128($ipv6naddr1,$ipv6naddr2);

Subtract two 128 bit string variables.

  input:        128 bit string var1,
                128 bit string var2
  returns:  scalar      carry
            array       (carry, result)

Note: The carry from this operation is the result of adding the one's complement of

ARG2 +1

to the

ARG1.

It is logically

NOT

borrow.

        i.e.    if ARG1 >= ARG2 then carry = 1
        or      if ARG1  < ARG2 then carry = 0

*

($spurious,$cidr) = notcontiguous($mask128);

This function counts the bit positions remaining in the mask when the rightmost '0's are removed.

        input:  128 bit netmask
        returns true if there are spurious
                    zero bits remaining in the
                    mask, false if the mask is
                    contiguous one's,
                128 bit cidr

*

$ipv6naddr = ipv4to6($netaddr);

Convert an ipv4 network address into an ipv6 network address.

  input:        32 bit network address
  returns:      128 bit network address

*

$ipv6naddr = mask4to6($netaddr);

Convert an ipv4 netowrk address into an ipv6 network mask.

  input:        32 bit network/mask address
  returns:      128 bit network/mask address

NOTE:

returns the high 96 bits as one's

*

$ipv6naddr = ipanyto6($netaddr);

Similar to ipv4to6 except that this function takes either an IPv4 or IPv6 input and always returns a 128 bit IPv6 network address.

  input:        32 or 128 bit network address
  returns:      128 bit network address

*

$ipv6naddr = maskanyto6($netaddr);

Similar to mask4to6 except that this function takes either an IPv4 or IPv6 netmask and always returns a 128 bit IPv6 netmask.

  input:        32 or 128 bit network mask
  returns:      128 bit network mask

*

$netaddr = ipv6to4($pv6naddr);

Truncate the upper 96 bits of a 128 bit address and return the lower 32 bits. Returns an IPv4 address as returned by inet_aton.

  input:        128 bit network address
  returns:      32 bit inet_aton network address

*

$bcdtext = bin2bcd($bits128);

Convert a 128 bit binary string into binary coded decimal text digits.

  input:        128 bit string variable
  returns:      string of bcd text digits

*

$bits128 = bcd2bin($bcdtxt);

Convert a bcd text string to 128 bit string variable

  input:        string of bcd text digits
  returns:      128 bit string variable

EXPORT_OK

        hasbits
        shiftleft
        addconst
        add128
        sub128
        notcontiguous
        ipv4to6
        mask4to6
        ipanyto6
        maskanyto6
        ipv6to4
        bin2bcd
        bcd2bin
        comp128
        bin2bcdn
        bcdn2txt
        bcdn2bin
        simple_pack
        threads

AUTHOR

Michael Robinton <michael@bizsystems.com>

COPYRIGHT

Copyright 2003 - 2012, Michael Robinton <michael@bizsystems.com>

All rights reserved.

This program is free software; you can redistribute it and/or modify it under the terms of either:

  a) the GNU General Public License as published by the Free
  Software Foundation; either version 2, or (at your option) any
  later version, or

  b) the "Artistic License" which comes with this distribution.

This program is distributed in the hope that it will be useful, but

; without even the implied warranty of or See either the General Public License or the Artistic License for more details.

You should have received a copy of the Artistic License with this distribution, in the file named ``Artistic''. If not, I'll be glad to provide one.

You should also have received a copy of the

General Public License along with this program in the file named ``Copying''. If not, write to the

        Free Software Foundation, Inc.,
        51 Franklin Street, Fifth Floor
        Boston, MA 02110-1301 USA

or visit their web page on the internet at:

        www.gnu.org/copyleft/gpl.html

AUTHOR

Michael Robinton <michael@bizsystems.com>