NetAddr::IP::Util -- IPv4/6 and 128 bit number utilities
use NetAddr::IP::Util qw( inet_aton inet_ntoa ipv6_aton ipv6_n2x ipv6_n2d inet_any2n hasbits isIPv4 inet_n2dx inet_n2ad ipv4to6 mask4to6 ipanyto6 maskanyto6 ipv6to4 shiftleft addconst add128 sub128 notcontiguous bin2bcd bcd2bin mode ); use NetAddr::IP::Util qw(:all :inet :ipv4 :ipv6 :math) :inet => inet_aton, inet_ntoa, ipv6_aton, ipv6_n2x, ipv6_n2d, inet_any2n, inet_n2dx, inet_n2ad, ipv4to6, mask4to6, ipanyto6, maskanyto6, ipv6to4 :ipv4 => inet_aton, inet_ntoa :ipv6 => ipv6_aton, ipv6_n2x, ipv6_n2d, inet_any2n, inet_n2dx, inet_n2ad ipv4to6, mask4to6, ipanyto6, maskanyto6, ipv6to4 :math => hasbits, isIPv4, addconst, add128, sub128, notcontiguous, bin2bcd, bcd2bin, shiftleft $dotquad = inet_ntoa($netaddr); $netaddr = inet_aton($dotquad); $ipv6naddr = ipv6_aton($ipv6_text); $hex_text = ipv6_n2x($ipv6naddr); $dec_text = ipv6_n2d($ipv6naddr); $ipv6naddr = inet_any2n($dotquad or $ipv6_text); $rv = hasbits($bits128); $rv = isIPv4($bits128); $dotquad or $hex_text = inet_n2dx($ipv6naddr); $dotquad or $dec_text = inet_n2ad($ipv6naddr); $ipv6naddr = ipv4to6($netaddr); $ipv6naddr = mask4to6($netaddr); $ipv6naddr = ipanyto6($netaddr); $ipv6naddr = maskanyto6($netaddr); $netaddr = ipv6to4($pv6naddr); $bitsX2 = shiftleft($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,$ipv6naddr2); ($carry,$ipv6naddr)=sub128($ipv6naddr1,$ipv6naddr2); ($spurious,$cidr) = notcontiguous($mask128); $bcdtext = bin2bcd($bits128); $bits128 = bcd2bin($bcdtxt); $modetext = mode;
Un-tar the distribution in an appropriate directory and type:
perl Makefile.PL make make test make install
NetAddr::IP::Util installs by default with its primary functions compiled using Perl's XS extensions to build a 'C' library. If you do not have a 'C' complier available or would like the slower Pure Perl version for some other reason, then type:
perl Makefile.PL -noxs make make test make install
NetAddr::IP::Util provides a suite of tools for manipulating and converting IPv4 and IPv6 addresses into 128 bit string context and back to text. The strings can be manipulated with Perl's logical operators:
and & or | xor ^
in the same manner as 'vec' strings.
The IPv6 functions support all rfc1884 formats.
i.e. x:x:x:x:x:x:x:x:x x:x:x:x:x:x:x:d.d.d.d ::x:x:x ::x:d.d.d.d and so on...
Convert a packed IPv4 network address to a dot-quad IP address.
input: packed network address returns: IP address i.e. 10.4.12.123
Convert a dot-quad IP address into an IPv4 packed network address.
input: IP address i.e. 192.5.16.32 returns: packed network address
Takes an IPv6 address of the form described in rfc1884 and returns a 128 bit binary RDATA string.
input: ipv6 text returns: 128 bit RDATA string
Takes an IPv6 RDATA string and returns an 8 segment IPv6 hex address
input: 128 bit RDATA string returns: x:x:x:x:x:x:x:x
Takes an IPv6 RDATA string and returns a mixed hex - decimal IPv6 address with the 6 uppermost chunks in hex and the lower 32 bits in dot-quad representation.
input: 128 bit RDATA string returns: x:x:x:x:x:x:d.d.d.d
This function converts a text IPv4 or IPv6 address in text format in any standard notation into a 128 bit IPv6 string address. It prefixes any dot-quad address (if found) with '::' and passes it to ipv6_aton.
input: dot-quad or rfc1844 address returns: 128 bit IPv6 string
This function returns true if there are one's present in the 128 bit string and false if all the bits are zero.
i.e. if (hasbits($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
This function does the right thing and returns the text for either a dot-quad IPv4 or a hex notation IPv6 address.
input: 128 bit IPv6 string returns: ddd.ddd.ddd.ddd or x:x:x:x:x:x:x:x
This function does the right thing and returns the text for either a dot-quad IPv4 or a hex::decimal notation IPv6 address.
input: 128 bit IPv6 string returns: ddd.ddd.ddd.ddd or x:x:x:x:x:x:ddd.ddd.ddd.dd
Convert an ipv4 network address into an ipv6 network address.
input: 32 bit network address returns: 128 bit network address
Convert an ipv4 network address/mask 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
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
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
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
input: 128 bit string variable, number of shifts [optional] returns: bits X n shifts NOTE: a single shift is performed if $n is not specified
Add a signed constant to a 128 bit string variable.
input: 128 bit IPv6 string, signed 32 bit integer returns: scalar carry array (carry, result)
Add two 128 bit string variables.
input: 128 bit string var1, 128 bit string var2 returns: scalar carry array (carry, result)
Subtract two 128 bit string variables.
input: 128 bit string var1,
128 bit string var2
returns: scalar carry
array (carry, result)
Note: The carry from this operation is the result of adding the one's complement of ARG2 +1 to the ARG1. It is logically NOT borrow.
i.e. if ARG1 >= ARG2 then carry = 1 or if ARG1 < ARG2 then carry = 0
This function counts the bit positions remaining in the mask when the rightmost '0's are removed.
input: 128 bit netmask returns true if there are spurious zero bits remaining in the mask, false if the mask is contiguous one's, 128 bit cidr number
Convert a 128 bit binary string into binary coded decimal text digits.
input: 128 bit string variable returns: string of bcd text digits
Convert a bcd text string to 128 bit string variable
input: string of bcd text digits returns: 128 bit string variable
Returns the operating mode of this module.
input: none returns: "Pure Perl" or "CC XS"
# convert any textual IP address into a 128 bit vector
#
sub text2vec {
my($anyIP,$anyMask) = @_;
# not IPv4 bit mask
my $notiv4 = ipv6_aton('FFFF:FFFF:FFFF:FFFF:FFFF:FFFF::');
my $vecip = inet_any2n($anyIP);
my $mask = inet_any2n($anyMask);
# extend mask bits for IPv4
my $bits = 128; # default
unless (hasbits($mask & $notiv4)) {
$mask |= $notiv4;
$bits = 32;
}
return ($vecip, $mask, $bits);
}
... alternate implementation, a little faster
sub text2vec {
my($anyIP,$anyMask) = @_;
# not IPv4 bit mask
my $notiv4 = ipv6_aton('FFFF:FFFF:FFFF:FFFF:FFFF:FFFF::');
my $vecip = inet_any2n($anyIP);
my $mask = inet_any2n($anyMask);
# extend mask bits for IPv4
my $bits = 128; # default
if (isIPv4($mask)) {
$mask |= $notiv4;
$bits = 32;
}
return ($vecip, $mask, $bits);
}
... elsewhere
$nip = {
addr => $vecip,
mask => $mask,
bits => $bits,
};
# return network and broadcast addresses from IP and Mask
#
sub netbroad {
my($nip) = shift;
my $notmask = ~ $nip->{mask};
my $bcast = $nip->{addr} | $notmask;
my $network = $nip->{addr} & $nip->{mask};
return ($network, $broadcast);
}
# check if address is within a network
#
sub within {
my($nip,$net) = @_;
my $addr = $nip->{addr}
my($nw,$bc) = netbroad($net);
# arg1 >= arg2, sub128 returns true
return (sub128($addr,$nw) && sub128($bc,$addr))
? 1 : 0;
}
# add a constant, wrapping at netblock boundries
# to subtract the constant, negate it before calling
# 'addwrap' since 'addconst' will extend the sign bits
#
sub addwrap {
my($nip,$const) = @_;
my $mask = $nip->{addr};
my $bits = $nip->{bits};
my $notmask = ~ $mask;
my $hibits = $addr & $mask;
my $addr = addconst($addr,$const);
my $wraponly = $addr & $notmask;
my $newip = {
addr => $hibits | $wraponly,
mask => $mask,
bits => $bits,
};
# bless $newip as appropriate
return $newip;
}
inet_aton inet_ntoa ipv6_aton ipv6_n2x ipv6_n2d inet_any2n hasbits isIPv4 inet_n2dx inet_n2ad ipv4to6 mask4to6 ipanyto6 maskanyto6 ipv6to4 shiftleft addconst add128 sub128 notcontiguous bin2bcd bcd2bin mode
Michael Robinton <michael@bizsystems.com>
The following functions are used in whole or in part as include files to Util.xs. The copyright is include in the file.
file: function: miniSocket.inc inet_aton, inet_ntoa
inet_aton, inet_ntoa are from the perl-5.8.0 release by Larry Wall, copyright 1989-2002. inet_aton, inet_ntoa code is current through perl-5.9.3 release. Thank you Larry for making PERL possible for all of us.
Copyright 2003 - 2007, Michael Robinton <michael@bizsystems.com>
LICENSE AND WARRANTY
This software is (c) Michael Robinton. It can be used under the terms of the perl artistic license provided that proper credit for the work of the author is preserved in the form of this copyright notice and license for this module.
No warranty of any kind is expressed or implied, by using it you accept any and all the liability.
Michael Robinton <michael@bizsystems.com>