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jxmot/ip_isvalid.php

Last active February 19, 2022 22:25
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IP Address Validator - PHP & JSON
Raw
ip_isvalid.php
<?php
/*
ip_isvalid() - Checks an IP address against a list of
valid IP addresses.
Params:
$_ip - can be `null` or an IP address. If `null`
then `REMADDR` will be checked.
Returns: An object, where `r` is either `true` (the
IP was found) or `false`. And `n` will contain
the associated name found in the `ipvalid.json`
file.
NOTE: This is only a simple security method, it
should not be used where security is crucial.
And it may not be suitable for use with a high
volume of IP traffic.
USAGE:
// this would typically be one of the first
// things executed in a PHP end point.
require_once './ip_isvalid.php';
$ret = ip_isvalid();
if($ret->r === false) {
header('HTTP/1.0 403 Not Allowed');
exit;
} else {
echo $ret->n . " is here!\n\n";
// valid IP, continue....
}
*/
define('REMADDR', ((isset($_SERVER['REMOTE_ADDR']) === true) ? $_SERVER['REMOTE_ADDR'] : 'none'));
$valid = json_decode(file_get_contents('./ipvalid.json'));
function ip_isvalid($_ip = null) {
global $valid;
$ip = '';
$ret = new stdClass();
$ret->r = false;
$ret->n = '';
if(($ip = ($_ip === null ? REMADDR : $_ip)) !== 'none') {
foreach($valid->list as $vip) {
if($ip === $vip[0]) {
$ret->r = true;
$ret->n = $vip[1];
break;
}
}
}
return $ret;
}
?>
Raw
ipvalid.json
{
"_comment":"Add entries to list[] as needed. Keep the total quantity within reason!",
"list": [
["0.0.0.0","example"],
["a.b.c.d","this is the identifying name for the ip owner"]
]
}
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