52 lines
1021 B
PHP
52 lines
1021 B
PHP
<?php
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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 $GLOBALS[version]\n";
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print "Jack-Benny Persson <jack-benny@cyberinfo.se>\n";
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print "\n";
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print "Usage: php netcalc.php <netmask>\n";
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print "Example: php netcalc.php 24\n";
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}
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// Check if first argument is set and and if not, print usage
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if (!isset($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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$value=$argv[1];
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// Check if our argument was a numeric value or not
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if (!is_numeric($value))
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{
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print "Please enter numbers only (between 0 and 32)\n";
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exit(1);
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}
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// Check if the value is between 0 and 32
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if ($value < 0 || $value > 32)
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{
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print "Please enter an integer between 0 and 32 only\n";
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exit(1);
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}
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// Calculate the diffrent values
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$base=32-$value;
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$netsize=pow(2, $base);
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$hosts=$netsize-2;
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if ($hosts < 0)
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{
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$hosts = 0;
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}
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// And now, finally, print the values
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print "Netmask: $value\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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exit(0);
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?>
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