NetAddr::IP::Util -- IPv4/6 and 128 bit number utilities
use NetAddr::IP::Util qw(
inet_aton
inet_ntoa
ipv6_aton
ipv6_ntoa
ipv6_n2x
ipv6_n2d
inet_any2n
hasbits
isIPv4
isNewIPv4
isAnyIPv4
inet_n2dx
inet_n2ad
inet_pton
inet_ntop
inet_4map6
ipv4to6
mask4to6
ipanyto6
maskanyto6
ipv6to4
packzeros
shiftleft
addconst
add128
sub128
notcontiguous
bin2bcd
bcd2bin
mode
AF_INET
AF_INET6
naip_gethostbyname
);
use NetAddr::IP::Util qw(:all :inet :ipv4 :ipv6 :math)
:inet => inet_aton, inet_ntoa, ipv6_aton
ipv6_ntoa, ipv6_n2x, ipv6_n2d,
inet_any2n, inet_n2dx, inet_n2ad,
inet_pton, inet_ntop, inet_4map6,
ipv4to6, mask4to6, ipanyto6, packzeros
maskanyto6, ipv6to4, naip_gethostbyname
:ipv4 => inet_aton, inet_ntoa
:ipv6 => ipv6_aton, ipv6_ntoa, ipv6_n2x,
ipv6_n2d, inet_any2n, inet_n2dx,
inet_n2ad, inet_pton, inet_ntop,
inet_4map6, ipv4to6, mask4to6,
ipanyto6, maskanyto6, ipv6to4,
packzeros, naip_gethostbyname
:math => hasbits, isIPv4, isNewIPv4, isAnyIPv4,
addconst, add128, sub128, notcontiguous,
bin2bcd, bcd2bin, shiftleft
$dotquad = inet_ntoa($netaddr);
$netaddr = inet_aton($dotquad);
$ipv6naddr = ipv6_aton($ipv6_text);
$ipv6_text = ipvt_ntoa($ipv6naddr);
$hex_text = ipv6_n2x($ipv6naddr);
$dec_text = ipv6_n2d($ipv6naddr);
$hex_text = packzeros($hex_text);
$ipv6naddr = inet_any2n($dotquad or $ipv6_text);
$ipv6naddr = inet_4map6($netaddr or $ipv6naddr);
$rv = hasbits($bits128);
$rv = isIPv4($bits128);
$rv = isNewIPv4($bits128);
$rv = isAnyIPv4($bits128);
$dotquad or $hex_text = inet_n2dx($ipv6naddr);
$dotquad or $dec_text = inet_n2ad($ipv6naddr);
$netaddr = inet_pton($AF_family,$hex_text);
$hex_text = inet_ntop($AF_family,$netaddr);
$ipv6naddr = ipv4to6($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);
$modetext = mode;
($name,$aliases,$addrtype,$length,@addrs)=naip_gethostbyname(NAME);
$trueif = havegethostbyname2();
NetAddr::IP::Util::lower();
NetAddr::IP::Util::upper();
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 ^
~ compliment
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...
- $dotquad = inet_ntoa($netaddr);
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
- $netaddr = inet_aton($dotquad);
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
- $ipv6addr = ipv6_aton($ipv6_text);
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
- $ipv6_text = ipv6_ntoa($ipv6naddr);
Convert a 128 bit binary IPv6 address to compressed rfc 1884
text representation.
input: 128 bit RDATA string
returns: ipv6 text
- $hex_text = ipv6_n2x($ipv6addr);
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
- $dec_text = ipv6_n2d($ipv6addr);
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
- $ipv6naddr = inet_any2n($dotquad or $ipv6_text);
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
- $rv = hasbits($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
- $ipv6naddr = inet_4map6($netaddr or $ipv6naddr
This function returns an ipV6 network address with the first 80 bits
set to zero and the next 16 bits set to one, while the last 32 bits
are filled with the ipV4 address.
input: ipV4 netaddr
or ipV6 netaddr
returns: ipV6 netaddr
returns: undef on error
An ipV6 network address must be in one of the two compatible ipV4
mapped address spaces. i.e.
::ffff::d.d.d.d or ::d.d.d.d
- $rv = isIPv4($bits128);
This function returns true if there are no on bits present in the IPv6
portion of the 128 bit string and false otherwise.
i.e. the address must be of the form - ::d.d.d.d
Note: this is an old and deprecated ipV4 compatible ipV6 address
=item * $rv = isNewIPv4($bits128);
This function return true if the IPv6 128 bit string is of the form
::ffff::d.d.d.d
- $rv = isAnyIPv4($bits128);
This function return true if the IPv6 bit string is of the form
::d.d.d.d or ::ffff::d.d.d.d
- $dotquad or $hex_text = inet_n2dx($ipv6naddr);
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
- $dotquad or $dec_text = inet_n2ad($ipv6naddr);
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
- $netaddr = inet_pton($AF_family,$hex_text);
This function takes an IP address in IPv4 or IPv6 text format and converts it into
binary format. The type of IP address conversion is controlled by the FAMILY
argument.
- $hex_text = inet_ntop($AF_family,$netaddr);
This function takes and IP address in binary format and converts it into
text format. The type of IP address conversion is controlled by the FAMILY
argument.
NOTE: inet_ntop ALWAYS returns lowercase characters.
- $hex_text = packzeros($hex_text);
This function optimizes and rfc 1884 IPv6 hex address to reduce the number of
long strings of zero bits as specified in rfc 1884, 2.2 (2) by substituting
:: for the first occurence of the longest string of zeros in the address.
- $ipv6naddr = ipv4to6($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 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
- $ipv6naddr = ipanyto6($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
- $bitsXn = shiftleft($bits128,$n);
input: 128 bit string variable,
number of shifts [optional]
returns: bits X n shifts
NOTE: a single shift is performed
if $n is not specified
- addconst($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 number
- $bcdtext = bin2bcd($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
- $modetext = mode;
Returns the operating mode of this module.
input: none
returns: "Pure Perl"
or "CC XS"
- ($name,$aliases,$addrtype,$length,@addrs)=naip_gethostbyname(NAME);
Replacement for Perl's gethostbyname if Socket6 is available
In ARRAY context, returns a list of five elements, the hostname or NAME,
a space separated list of C_NAMES, AF family, length of the address
structure, and an array of one or more netaddr's
In SCALAR context, returns the first netaddr.
This function ALWAYS returns an IPv6 address, even on IPv4 only systems.
IPv4 addresses are mapped into IPv6 space in the form:
::FFFF:FFFF:d.d.d.d
This is NOT the expected result from Perl's gethostbyname2. It is instead equivalent to:
On an IPv4 only system:
$ipv6naddr = ipv4to6 scalar ( gethostbyname( name ));
On a system with Socket6 and a working gethostbyname2:
$ipv6naddr = gethostbyname2( name, AF_INET6 );
and if that fails, the IPv4 conversion above.
For a gethostbyname2 emulator that behave like Socket6, see:
the Net::DNS::Dig manpage
- $trueif = havegethostbyname2();
This function returns TRUE if Socket6 has a functioning gethostbyname2,
otherwise it returns FALSE. See the comments above about the behavior of
naip_gethostbyname.
- NetAddr::IP::Util::lower();
Return IPv6 strings in lowercase.
- NetAddr::IP::Util::upper();
Return IPv6 strings in uppercase. This is the default.
# convert any textual IP address into a 128 bit vector
#
sub text2vec {
my($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;
}
# truely hard way to do $ip++
# add a constant, wrapping at netblock boundaries
# to subtract the constant, negate it before calling
# 'addwrap' since 'addconst' will extend the sign bits
#
sub addwrap {
my($nip,$const) = @_;
my $addr = $nip->{addr};
my $mask = $nip->{mask};
my $bits = $nip->{bits};
my $notmask = ~ $mask;
my $hibits = $addr & $mask;
$addr = addconst($addr,$const);
my $wraponly = $addr & $notmask;
my $newip = {
addr => $hibits | $wraponly,
mask => $mask,
bits => $bits,
};
# bless $newip as appropriate
return $newip;
}
# something more useful
# increment a /24 net to the NEXT net at the boundry
my $nextnet = 256; # for /24
LOOP:
while (...continuing) {
your code....
...
my $lastip = $ip-copy();
$ip++;
if ($ip < $lastip) { # host part wrapped?
# discard carry
(undef, $ip->{addr} = addconst($ip->{addr}, $nextnet);
}
next LOOP;
}
inet_aton
inet_ntoa
ipv6_aton
ipv6_ntoa
ipv6_n2x
ipv6_n2d
inet_any2n
hasbits
isIPv4
isNewIPv4
isAnyIPv4
inet_n2dx
inet_n2ad
inet_pton
inet_ntop
inet_4map6
ipv4to6
mask4to6
ipanyto6
maskanyto6
ipv6to4
packzeros
shiftleft
addconst
add128
sub128
notcontiguous
bin2bcd
bcd2bin
mode
naip_gethostbyname
havegethostbyname2
Michael Robinton <michael@bizsystems.com>
Copyright 2003 - 2014, 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.
Michael Robinton <michael@bizsystems.com>
NetAddr::IP(3), NetAddr::IP::Lite(3), NetAddr::IP::InetBase(3)
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