150 lines
3.9 KiB
PHP
Executable File
150 lines
3.9 KiB
PHP
Executable File
#!/usr/bin/php
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<?php
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/*
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Copyright (C) 2014 Jack-Benny Persson <jack-benny@cyberinfo.se>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Netcalc is a simple PHP CLI script to calculate the size of a network
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from a given netmask in slash notation */
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$version="0.1";
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function print_usage()
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{
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print "netcalc.php $GLOBALS[version]\n";
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print "Jack-Benny Persson <jack-benny@cyberinfo.se>\n";
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print "\n";
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print "Usage: php netcalc.php <netmask>\n";
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print "Example: php netcalc.php 24\n";
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}
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function print_netmask($number)
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{
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$number = $number-1;
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$mask = $number+1;
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$ones = 1;
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$zeros = 0;
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$num_zeros = 32-$number-2;
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// Itterate the binary ones, adding one 1 for every run
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for ($i = 0; $i < $number; $i++)
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{
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$ones .= 1;
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}
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unset($i);
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// Itterate the binary zeros, adding one 0 for every run
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for ($i = 0; $i < $num_zeros; $i++)
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{
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$zeros .= 0;
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}
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unset($i);
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// Special cases when netmask is 0 or 32
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if ($mask == 0)
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{
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// If the network mask is 0, then just put 32 zeros in the string
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$binary = "00000000000000000000000000000000";
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}
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elseif ($mask == 32)
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{
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// If the network mask is 32, then just put 32 ones in the string
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$binary = "11111111111111111111111111111111";
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}
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else
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{
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// Else put the ones and zeros together in a binary string
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$binary = "$ones$zeros";
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}
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// Make it dotted binary format
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$dotted_binary = substr_replace($binary, ".", 8, 0);
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$dotted_binary = substr_replace($dotted_binary, ".", 17, 0);
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$dotted_binary = substr_replace($dotted_binary, ".", 26, 0);
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// Make it dotted decimal format
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$firstOctet = base_convert(substr($binary, 0, 8), 2, 10);
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$secondOctet = base_convert(substr($binary, 8, 8), 2, 10);
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$thirdOctet = base_convert(substr($binary, 16, 8), 2, 10);
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$forthOctet = base_convert(substr($binary, 24, 8),2, 10);
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// Print it in different formats
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print "Netmask\n" ;
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print "-------\n";
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print "In slash notation: $mask\n";
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print "In dotted decimal: $firstOctet.$secondOctet.$thirdOctet.$forthOctet\n";
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print "In dotted binary: $dotted_binary";
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print "\n\n";
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}
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function print_values($value)
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{
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// Calculate the network size and usable addresses
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$base=32-$value;
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$netsize=pow(2, $base);
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$hosts=$netsize-2;
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// We don't want negative values
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if ($hosts < 0)
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{
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$hosts = 0;
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}
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// Print the network size and usable addresses
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print "Network size\n";
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print "------------\n";
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print "Total number of addresses: $netsize\n";
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print "Number of usable addresses for hosts: $hosts\n";
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}
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// MAIN
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// Check if first argument is set and and if not, print usage
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if (!isset($argv[1]))
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{
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print_usage();
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exit(1);
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}
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$input=$argv[1];
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// Check if our argument was a numeric value or not
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if (!is_numeric($input))
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{
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print "Please enter numbers only (between 0 and 32)\n";
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exit(1);
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}
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// Check if the value is between 0 and 32
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if ($input < 0 || $input > 32)
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{
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print "Please enter an integer between 0 and 32 only\n";
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exit(1);
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}
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// Print the netmask first
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print_netmask($input);
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// And now, finally, print the network size and usable addresses
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print_values($input);
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exit(0);
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?>
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