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NetAddr::IP::UtilPP.3pm

NAME

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

SYNOPSIS

  use NetAddr::IP::UtilPP qw(

        hasbits

        isIPv4

        shiftleft

        addconst

        add128

        sub128

        notcontiguous

        ipv4to6

        mask4to6

        ipanyto6

        maskanyto6

        ipv6to4

        bin2bcd

        bcd2bin

  );

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

  $rv = hasbits($bits128);

  $rv = isIPv4($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

* $rv = isIPv4($bits128);

This function returns true if there are no on bits present in the IPv6 portion of the 128 bit string and false otherwise.

* $bitsXn = shiftleft($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

* ($cidr,$spurious) = 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

        isIPv4

        shiftleft

        addconst

        add128

        sub128

        notcontiguous

        ipv4to6

        mask4to6

        ipanyto6

        maskanyto6

        ipv6to4

        bin2bcd

        bcd2bin

        comp128

        bin2bcdn

        bcdn2txt

        bcdn2bin

        simple_pack

AUTHOR

Michael Robinton <michael@bizsystems.com>

COPYRIGHT

Copyright 2006, Michael Robinton <michael@bizsystems.com>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (except as noted otherwise in individuals sub modules) published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

AUTHOR

Michael Robinton <michael@bizsystems.com>