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

Michael Robinton <michael@bizsystems.com> perl v5.40.0 2024-10-20 NetAddr::IP::UtilPP(3pm)

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 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See either the GNU 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 GNU 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: http://www.gnu.org/copyleft/gpl.html.

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,$ipv6naddr2); Subtract two 128 bit string variables. input: 128 bit string var1, 128 bit string var2 returns: scalar carry array (carry, result) Note: The carry from this operation is the result of adding the one's complement of ARG2 +1 to the ARG1. It is logically NOTborrow. i.e. if ARG1 >= ARG2 then carry = 1 or if ARG1 < ARG2 then carry = 0 • ($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

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

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

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);