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ipcalc
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ipcalc
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#!/usr/bin/perl -w
# IPv4 Calculator
# Copyright (C) Krischan Jodies 2000 - 2004
# krischan()jodies.de, http://jodies.de/ipcalc
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as 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., 675 Mass Ave, Cambridge, MA 02139, USA.
use strict;
my $version = '0.41';
my @class = qw (0 8 16 24 4 5 5);
my $quads_color = "\033[34m"; # dotted quads, blue
my $norml_color = "\033[m"; # normal, black
#my $binry_color = "\033[1m\033[46m\033[37m"; # binary, yellow
my $binry_color = "\033[33m"; # binary, yellow
my $mask_color = "\033[31m"; # netmask, red
my $class_color = "\033[35m"; # classbits, magenta
my $subnt_color = "\033[0m\033[32m"; # subnet bits, green
my $error_color = "\033[31m";
my $sfont = "";
my $break ="\n";
my $color_old = "";
my $color_actual = "";
my $opt_text = 1;
my $opt_html = 0;
my $opt_color = 0;
my $opt_print_bits = 1;
my $opt_print_only_class = 0;
my $opt_split = 0;
my $opt_deaggregate = 0;
my $opt_version = 0;
my $opt_help = 0;
my @opt_split_sizes;
my @arguments;
my $error = "";
my $thirtytwobits = 4294967295; # for masking bitwise not on 64 bit arch
main();
exit;
sub main
{
my $address = -1;
my $address2 = -1;
my $network = -1;
my $mask1 = -1;
my $mask2 = -1;
if (! defined ($ARGV[0])) {
usage();
exit();
}
@ARGV = getopts();
if ($opt_help) {
help();
exit;
}
if ($opt_version) {
print "$version\n";
exit;
}
#print "opt_html $opt_html\n";
#print "opt_color $opt_color\n";
#print "opt_print_bits $opt_print_bits\n";
#print "opt_print_only_class $opt_print_only_class\n";
#print "opt_deaggregate $opt_deaggregate\n";
if (! $opt_color) {
$quads_color = '';
$norml_color = '';
$binry_color = '';
$mask_color = '';
$class_color = '';
$subnt_color = '';
$sfont = '';
}
if ($opt_html) {
$quads_color = '<font color="#0000ff">' ;
$norml_color = '<font color="#000000">';
$binry_color = '<font color="#909090">';
$mask_color = '<font color="#ff0000">';
$class_color = '<font color="#009900">';
$subnt_color = '<font color="#663366">';
$sfont = '</font>';
$break = "<br>";
#$private = "(<a href=\"http://www.ietf.org/rfc/rfc1918.txt\">Private Internet</a>)";
# print "<pre>\n";
print << 'EOF';
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta HTTP-EQUIV="content-type" CONTENT="text/html; charset=UTF-8">
<title>Bla</title>
</head>
<body>
EOF
print "<!-- Version $version -->\n";
}
# foreach (@arguments) {
# print "arguments: $_\n";
# }
# foreach (@ARGV) {
# print "ARGV: $_\n";
# }
# get base address
if (defined $ARGV[0]) {
$address = argton($ARGV[0],0);
}
if ($address == -1) {
$error .= "INVALID ADDRESS: $ARGV[0]\n";
$address = argton("192.168.1.1");
}
if ($opt_print_only_class) {
print getclass($address,1);
exit;
}
# if deaggregate get last address
if ($opt_deaggregate) {
if (defined $ARGV[1]) {
$address2 = argton($ARGV[1],0);
}
if ($address2 == -1) {
$error .= "INVALID ADDRESS2: $ARGV[1]\n";
$address2 = argton("192.168.1.1");
}
}
if ($opt_deaggregate) {
if ($error) {
print "$error\n";
}
print "deaggregate ".ntoa($address) . " - " . ntoa($address2)."\n";
deaggregate($address,$address2);
exit;
}
# get netmasks
if (defined $ARGV[1]) {
$mask1 = argton($ARGV[1],1);
} else {
#get natural mask ***
$mask1 = argton(24);
}
if ($mask1 == -1) {
$error .= "INVALID MASK1: $ARGV[1]\n";
$mask1 = argton(24);
}
if (defined $ARGV[2]) {
$mask2 = argton($ARGV[2],1);
} else {
$mask2 = $mask1;
}
if ($mask2 == -1) {
$error .= "INVALID MASK2: $ARGV[2]\n";
$mask2 = argton(24);
}
if ($error) {
if ($opt_color) {
print set_color($error_color);
}
print "$error\n";
}
# print "Address: ".ntoa($address)."\n";
# print "mask1: ($mask1) ".ntoa($mask1)."\n";
# print "mask2: ($mask2) ".ntoa($mask2)."\n";
html('<table border="0" cellspacing="0" cellpadding="0">');
html("\n");
printline ("Address", $address ,$mask1,$mask1,1);
printline ("Netmask", $mask1 ,$mask1,$mask1);
printline ("Wildcard", ~$mask1 ,$mask1,$mask1);
html("<tr>\n");
html('<td colspan="3"><tt>');
print "=>";
html("</tt></td>\n");
html("</tr>\n");
print "\n";
$network = $address & $mask1;
printnet($network,$mask1,$mask1);
html("</table>\n");
if ($opt_deaggregate) {
deaggregate();
}
if ($opt_split) {
split_network($network,$mask1,$mask2,@opt_split_sizes);
exit;
}
if ($mask1 < $mask2) {
print "Subnets after transition from /" . ntobitcountmask($mask1);
print " to /". ntobitcountmask($mask2) . "\n\n";
subnets($network,$mask1,$mask2);
}
if ($mask1 > $mask2) {
print "Supernet\n\n";
supernet($network,$mask1,$mask2);
}
if ($opt_html) {
print << 'EOF';
<p>
<a href="http://validator.w3.org/check/referer"><img border="0"
src="http://www.w3.org/Icons/valid-html401"
alt="Valid HTML 4.01!" height="31" width="88"></a>
</p>
EOF
}
exit;
}
# ---------------------------------------------------------------------
sub end {
if ($opt_html) {
# print "\n</pre>\n";
print "<html>\n";
}
exit;
}
sub supernet {
my ($network,$mask1,$mask2) = @_;
$network = $network & $mask2;
printline ("Netmask", $mask2 ,$mask2,$mask1,1);
printline ("Wildcard", ~$mask2 ,$mask2,$mask1);
print "\n";
printnet($network,$mask2,$mask1);
}
sub subnets
{
my ($network,$mask1,$mask2) = @_;
my $subnet=0;
my $bitcountmask1 = ntobitcountmask($mask1);
my $bitcountmask2 = ntobitcountmask($mask2);
html('<table border="0" cellspacing="0" cellpadding="0">');
html("\n");
printline ("Netmask", $mask2 ,$mask2,$mask1,1);
printline ("Wildcard", ~$mask2 ,$mask2,$mask1);
html("</table>\n");
print "\n";
for ($subnet=0; $subnet < (1 << ($bitcountmask2-$bitcountmask1)); $subnet++)
{
my $net = $network | ($subnet << (32-$bitcountmask2));
print " ". ($subnet+1) .".\n";
html('<table border="0" cellspacing="0" cellpadding="0">');
html("\n");
printnet($net,$mask2,$mask1);
html("</table>\n");
if ($subnet >= 1000) {
print "... stopped at 1000 subnets ...$break";
last;
}
}
$subnet = (1 << ($bitcountmask2-$bitcountmask1));
my $hostn = ($network | ((~$mask2) & $thirtytwobits)) - $network - 1;
if ($hostn > -1) {
print "\nSubnets: $quads_color$subnet";
html('</font>');
print "$norml_color$break";
html('</font>');
}
if ($hostn < 1 ) {
$hostn = 1;
}
print "Hosts: $quads_color" . ($hostn * $subnet);
html('</font>');
print "$norml_color$break";
html('</font>');
}
sub getclass {
my $network = shift;
my $numeric = shift;
my $class = 1;
# print "n $network bit ". (1 << (32-$class)) . " & " .
while (($network & (1 << (32-$class))) == (1 << (32-$class)) ) {
$class++;
if ($class > 5) {
return "invalid";
}
}
if ($numeric) {
return $class[$class];
} else {
return chr($class+64);
}
}
sub printnet {
my ($network,$mask1,$mask2) = @_;
my $hmin;
my $hmax;
my $hostn;
my $mask;
my $broadcast = $network | ((~$mask1) & $thirtytwobits);
$hmin = $network + 1;
$hmax = $broadcast - 1;
$hostn = $hmax - $hmin + 1;
$mask = ntobitcountmask($mask1);
if ($mask == 31) {
$hmax = $broadcast;
$hmin = $network;
$hostn = 2;
}
if ($mask == 32) {
$hostn = 1;
}
#if ($hmax < $hmin) {
# $hmax = $hmin;
# $hostn = 1;
#}
#private...
#$p = 0;
#for ($i=0; $i<3; $i++) {
# if ( (&bintoint($hmax) <= $privmax[$i]) &&
# (&bintoint($hmin) >= $privmin[$i]) ) {
# $p = $i +1;
# last;
# }
#}
#if ($p) {
# $p = $private;
#} else {
# $p = '';
#}
if ($mask == 32) {
printline ("Hostroute", $network ,$mask1,$mask2,1);
} else {
printline ("Network", $network ,$mask1,$mask2,1);
printline ("HostMin", $hmin ,$mask1,$mask2);
printline ("HostMax", $hmax ,$mask1,$mask2);
printline ("Broadcast", $broadcast,$mask1,$mask2) if $mask < 31;
}
# html("</table>\n");
# html('<table border="0" cellspacing="0" cellpadding="0">');
# html("\n");
html("<tr>\n");
html('<td valign="top"><tt>'); #label
print set_color($norml_color);
print "Hosts/Net: " ;
html("</font></tt></td>\n");
html('<td valign="top"><tt>');
# printf $norml_color . "Hosts/Net: </tt>$quads_color%-22s",$hostn;
# html("<td><tt>");
print set_color($quads_color);
printf "%-22s",$hostn;
# printf "%-22s", (ntoa($address).$additional_info);
html("</font></tt></td>\n");
html("<td>"); #label
if ($opt_html) {
#warn "HTML\n";
print wrap_html(30,get_description($network,$mask1));
} else {
print get_description($network,$mask1);
}
html("</font></td>\n");
html("</tr>\n");
html("\n");
text("\n");
text("\n");
##printf "Class %s, ",getclass($network);
##printf "%s",netblock($network,$mask1);
# my ($label,$address,$mask1,$mask2,$classbitcolor_on,$is_netmask) = @_;
# print $sfont . $norml_color;
# print "$break\n";
# exit;
return $hostn;
}
sub get_description
{
my $network = shift;
my $mask = shift;
my @description;
my $field;
# class
if ($opt_color || $opt_html) {
$field = set_color($class_color) . "Class " . getclass($network);
if ($opt_html) {
$field .= '</font>';
}
$field .= set_color($norml_color);
push @description, $field
# push @description, set_color($class_color) . "Class " .
# getclass($network) . set_color($norml_color);
} else {
push @description, "Class " . getclass($network);
}
# netblock
my ($netblock_txt,$netblock_url) = split ",",netblock($network,$mask);
if (defined $netblock_txt) {
if ($opt_html) {
$netblock_txt = '<a href="' . $netblock_url . '">' .
$netblock_txt . '</a>';
}
#warn "DESC: '$netblock_txt'";
push @description,$netblock_txt;
}
# /31
if (ntobitcountmask($mask) == 31) {
if ($opt_html) {
push @description,"<a href=\"http://www.ietf.org/rfc/rfc3021.txt\">PtP Link</a>";
} else {
push @description,"PtP Link RFC 3021";
}
}
#$rfc3021 = "<a href=\"http://www.ietf.org/rfc/rfc3021.txt\">Point-to-Point
#Link</a>";
return join ", ",@description;
}
sub printline
{
my ($label,$address,$mask1,$mask2,$html_fillup) = @_;
$mask1 = ntobitcountmask($mask1);
$mask2 = ntobitcountmask($mask2);
my $line = "";
my $bit;
my $newbitcolor_on = 0;
my $toggle_newbitcolor = 0;
my $bit_color;
my $additional_info = '';
my $classbitcolor_on;
my $second_field;
if ($label eq 'Netmask') {
$additional_info = " = $mask1";
}
if ($label eq 'Network') {
$classbitcolor_on = 1;
$additional_info = "/$mask1";
}
if ($label eq 'Hostroute' && $mask1 == 32) {
$classbitcolor_on = 1;
}
html("<tr>\n");
html("<td><tt>");
#label
print set_color($norml_color);
if ($opt_html && $html_fillup) {
print "$label:";
print " " x (11 - length($label));
} else {
printf "%-11s","$label:";
}
html("</font></tt></td>\n");
#address
html("<td><tt>");
print set_color($quads_color);
#printf "%s-22s",(ntoa($address).$additional_info);
#printf "%s%-11s$sfont%s",set_color($norml_color),"$label:",set_color($quads_color);
$second_field = ntoa($address).$additional_info;
if ($opt_html && $html_fillup) {
print $second_field;
print " " x (21 - length($second_field));
} else {
printf "%-21s", (ntoa($address).$additional_info);
}
html("</font></tt></td>\n");
if ($opt_print_bits)
{
html("<td><tt>");
$bit_color = set_color($binry_color);
if ($label eq 'Netmask') {
$bit_color = set_color($mask_color);
}
if ($classbitcolor_on) {
$line .= set_color($class_color);
} else {
$line .= set_color($bit_color);
}
for (my $i=1;$i<33;$i++)
{
$bit = 0;
if (($address & (1 << 32-$i)) == (1 << 32-$i)) {
$bit = 1;
}
$line .= $bit;
if ($classbitcolor_on && $bit == 0) {
$classbitcolor_on = 0;
if ($newbitcolor_on) {
$line .= set_color($subnt_color);
} else {
$line .= set_color($bit_color);
}
}
# print "$mask1 $i % 8 == " . (($i) % 8) . "\n";
if ($i % 8 == 0 && $i < 32) {
$line .= set_color($norml_color) . '.';
$line .= set_color('oldcolor');
}
if ($i == $mask1) {
$line .= " ";
}
if (($i == $mask1 || $i == $mask2) && $mask1 != $mask2) {
if ($newbitcolor_on) {
$newbitcolor_on = 0;
$line .= set_color($bit_color) if ! $classbitcolor_on;
} else {
$newbitcolor_on = 1;
$line .= set_color($subnt_color) if ! $classbitcolor_on;
}
}
}
$line .= set_color($norml_color);
print "$line";
html("</tt></font></td>\n");
}
html("</tr>\n");
html("\n");
text("\n");
#print $sfont . $break;
}
sub text
{
my $str = shift;
if ($opt_text) {
print "$str";
}
}
sub html
{
my $str = shift;
if ($opt_html) {
print "$str";
}
}
sub set_color
{
my $new_color = shift;
my $return;
if ($new_color eq $color_old) {
# print "SETCOLOR saved one dupe\n";
# $return = 'x';
$return = '';
}
if ($new_color eq 'oldcolor') {
$new_color = $color_old;
}
$color_old = $color_actual;
#$return .= "$color_actual" . "old";
$color_actual = $new_color;
#return $new_color;
$return .= $new_color;
return $return;
}
sub split_network
{
my $network = shift;
my $mask1 = shift;
my $mask2 = shift;
my @sizes = @_;
my $first_address = $network;
my $broadcast = $network | ((~$mask1) & $thirtytwobits);
my @network;
my $i=0;
my @net;
my @mask;
my $needed_addresses = 0;
my $needed_size;
foreach (@sizes) {
$needed_size = round2powerof2($_+2);
# printf "%3d -> %3d -> %3d\n",$_,$_+2,$needed_size;
push @network , $needed_size .":".$i++;
$needed_addresses += $needed_size;
}
@network = sort { ($b =~ /(.+):/)[0] <=> ($a =~ /(.+):/)[0] } @network;
foreach (@network) {
my ($size,$nr) = split ":",$_;
$net[$nr]= $network;
$mask[$nr]= (32-log($size)/log(2));
$network += $size;
}
$i = -1;
while ($i++ < $#sizes) {
printf "%d. Requested size: %d hosts\n", $i+1,$sizes[$i];
###$mask = $mask[$i];
#$mark_newbits = 1;
###print_netmask(bitcountmasktobin($mask[$i]),$mask);
printline("Netmask",bitcountmaskton($mask[$i]),bitcountmaskton($mask[$i]),$mask2);
printnet($net[$i],bitcountmaskton($mask[$i]),$mask2);
}
my $used_mask = 32-log(round2powerof2($needed_addresses))/log(2);
if ($used_mask < ntobitcountmask($mask1)) {
print "Network is too small\n";
}
print "Needed size: ". $needed_addresses . " addresses.\n";
print "Used network: ". ntoa($first_address) ."/$used_mask\n";
print "Unused:\n";
deaggregate($network,$broadcast);
}
sub round2powerof2 {
my $i=0;
while ($_[0] > ( 1 << $i)) {
$i++;
}
return 1 << $i;
}
# Deaggregate address range
# expects: range: (dotted quads)start (dotted quads)end
sub deaggregate
{
my $start = shift;
my $end = shift;
my $base = $start;
my $step;
while ($base <= $end)
{
$step = 0;
while (($base | (1 << $step)) != $base) {
if (($base | (((~0) & $thirtytwobits) >> (31-$step))) > $end) {
last;
}
$step++;
}
print ntoa($base)."/" .(32-$step);
print "\n";
$base += 1 << $step;
}
}
sub getopts
# expects nothing
# returns @ARGV without options
# sets global opt variables
# -h --html
# -h without further opts -> help
# (workaround: can't change meaning of -h since this would
# break old cgi_wrapper scripts)
# --help
# -n --nocolor
# -v --version
# -c --class print natural class
# -s --split
# -b --nobinary
# -d --deaggregate
{
my @arguments;
my $arg;
my $prefix;
my $nr_opts = 0;
my @tmp;
# opt_color defaults to 1 when connected to a terminal
if (-t STDOUT) {
$opt_color = 1;
}
while (has_opts()) {
$arg = shift @ARGV;
if ($arg =~ /^--(.+)/) {
$nr_opts += read_opt('--',$1);
}
elsif ($arg =~ /^-(.+)/) {
$nr_opts += read_opt('-',split //,$1);
}
else {
push @tmp, $arg;
}
}
# foreach (@arguments) {
# print "arg: $_\n";
# }
foreach (@ARGV) {
push @tmp,$_;
}
# extract base address and netmasks and ranges
foreach (@tmp) {
if (/^(.+?)\/(.+)$/) {
push @arguments,$1;
push @arguments,$2;
}
elsif (/^(.+)\/$/) {
push @arguments,$1;
}
elsif (/^(.+)\-(.+)$/) {
push @arguments,$1;
push @arguments,$2;
$opt_deaggregate = 1;
}
elsif (/^\-$/) {
$opt_deaggregate = 1;
}
else {
push @arguments, $_;
}
}
if ($#arguments == 2 && $arguments[1] eq '-') {
@arguments = ($arguments[0],$arguments[2]);
$opt_deaggregate = 1;
}
# workaround for -h
if ($opt_html && $nr_opts == 1 && $#arguments == -1) {
$opt_help = 1;
}
if ($error) {
print "$error";
exit;
}
return @arguments;
sub read_opt {
my $prefix = shift;
my $opts_read = 0;
foreach my $opt (@_)
{
++$opts_read;
if ($opt eq 'h' || $opt eq 'html') {
$opt_html = 1;
$opt_text = 0;
}
elsif ($opt eq 'help') {
$opt_help = 1;
}
elsif ($opt eq 'n' || $opt eq 'nocolor') {
$opt_color = 0;
}
elsif ($opt eq 'v' || $opt eq 'version') {
$opt_version = 1;
}
elsif ($opt eq 'b' || $opt eq 'nobinary') {
$opt_print_bits = 0;
}
elsif ($opt eq 'c' || $opt eq 'class') {
$opt_print_only_class = 1;
}
elsif ($opt eq 'r' || $opt eq 'range') {
$opt_deaggregate = 1;
}
elsif ($opt eq 's' || $opt eq 'split') {
$opt_split = 1;
while (defined $ARGV[0] && $ARGV[0] =~ /^\d+$/) {
push @opt_split_sizes, shift @ARGV;
}
if ($#opt_split_sizes < 0) {
$error .= "Argument for ". $prefix . $opt . " is missing or invalid \n";
}
}
else {
$error .= "Unknown option: " . $prefix . $opt . "\n";
--$opts_read;
}
}
return $opts_read;
}
sub has_opts {
foreach (@ARGV) {
return 1 if /^-/;
}
return 0;
}
}
# expects int width
# string
# returns wrapped string
sub wrap_html
{
my $width = shift;
my $str = shift;
#warn "WRAP: '$str'\n";
my @str = split //,$str;
my $result;
my $current_pos = 0;
my $start = 0;
my $last_pos = 0;
my $line;
while ($current_pos < $#str)
{
#warn "$current_pos\n";
#warn "$current_pos: $str[$current_pos]\n";
# find next blank
while ($current_pos < $#str && $str[$current_pos] ne ' ') {
# ignore tags
if ($str[$current_pos] eq '<') {
$current_pos++;
while ($str[$current_pos] ne '>') {
$current_pos++;
}
}
$current_pos++;
}
# fits in one line?...
$line = substr($str,$start,$current_pos-$start);
$line =~ s/<.+?>//g;
if ( length($line) <= $width) {
# ... yes. keep position in mind and try next
$last_pos = $current_pos;
$current_pos++;
next;
} else {
# ...no. wrap at last position (if there was one,
# otherwise wrap here)
if ($last_pos ne $start) {
$current_pos = $last_pos;
}
$line = substr($str,$start,$current_pos-$start);
$current_pos++;
$start = $current_pos;
$last_pos = $start;
# no output if end of string is reached because
# rest of string is treated after this block
if ($current_pos < $#str) {
#warn "RESULT+ '$line'\n";
$result .= "$line<br>";
}
}
}
$line = substr($str,$start,$current_pos-$start);
$result .= "$line";
#warn "'return RESULT $result'\n";
return $result;
}
# gets network address as dq
# returns string description,string url
sub netblock
{
my ($mynetwork_start,$mymask) = @_;
my $mynetwork_end = $mynetwork_start | ((~$mymask) & $thirtytwobits);
my %netblocks = ( "192.168.0.0/16" => "Private Internet,http://www.ietf.org/rfc/rfc1918.txt",
"172.16.0.0/12" => "Private Internet,http://www.ietf.org/rfc/rfc1918.txt",
"10.0.0.0/8" => "Private Internet,http://www.ietf.org/rfc/rfc1918.txt",
"169.254.0.0/16" => "APIPA,http://www.ietf.org/rfc/rfc3330.txt",
"127.0.0.0/8" => "Loopback,http://www.ietf.org/rfc/rfc1700.txt",
"224.0.0.0/4" => "Multicast,http://www.ietf.org/rfc/rfc3171.txt"
);
my $match = 0;
#
foreach (keys %netblocks) {
my ($network,$mask) = split "/",$_;
my $start = argton($network);
my $end = $start + (1 << (32-$mask)) -1;
# mynetwork starts within block
if ($mynetwork_start >= $start && $mynetwork_start <= $end) {
$match++;
}
# mynetwork ends within block
if ($mynetwork_end >= $start && $mynetwork_end <= $end) {
$match++;
}
# block is part of mynetwork
if ($start > $mynetwork_start && $end < $mynetwork_end) {
$match = 1;
}
if ($match == 1) {
return "In Part ".$netblocks{$_};
}
if ($match == 2) {
return $netblocks{$_};
}
}
return "";
}
# ------- converter ---------------------------------------------
sub bitcountmaskton
{
my $bitcountmask = shift;
my $n;
for (my $i=0;$i<$bitcountmask;$i++) {
$n |= 1 << (31-$i);
}
return $n;
}
sub argton
# expects 1. an address as dotted decimals, bit-count-mask, or hex
# 2. netmask flag. if set -> check netmask and negate wildcard
# masks
# returns integer or -1 if invalid
{
my $arg = shift;
my $netmask_flag = shift;
my $i = 24;
my $n = 0;
# dotted decimals
if ($arg =~ /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/) {
my @decimals = ($1,$2,$3,$4);
foreach (@decimals) {
if ($_ > 255 || $_ < 0) {
return -1;
}
$n += $_ << $i;
$i -= 8;
}
if ($netmask_flag) {
return validate_netmask($n);
}
return $n;
}
# bit-count-mask (24 or /24)
$arg =~ s/^\/(\d+)$/$1/;
if ($arg =~ /^\d{1,2}$/) {
if ($arg < 1 || $arg > 32) {
return -1;
}
for ($i=0;$i<$arg;$i++) {
$n |= 1 << (31-$i);
}
return $n;
}
# hex
if ($arg =~ /^[0-9A-Fa-f]{8}$/ ||
$arg =~ /^0x[0-9A-Fa-f]{8}$/ ) {
if ($netmask_flag) {
return validate_netmask(hex($arg));
}
return hex($arg);
}
# invalid
return -1;
sub validate_netmask
{
my $mask = shift;
my $saw_zero = 0;
# negate wildcard
if (($mask & (1 << 31)) == 0) {
print "WILDCARD\n";
$mask = ~$mask;