mirror of
https://github.com/WhatCD/Gazelle.git
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52 lines
1.3 KiB
PHP
52 lines
1.3 KiB
PHP
<?
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if (isset($_SERVER['http_if_modified_since'])) {
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header('Status: 304 Not Modified');
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die();
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}
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header('Expires: '.date('D, d-M-Y H:i:s \U\T\C', time() + 3600 * 24 * 120)); //120 days
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header('Last-Modified: '.date('D, d-M-Y H:i:s \U\T\C', time()));
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if (!check_perms('users_view_ips')) {
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die('Access denied.');
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}
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$Octets = explode('.', $_GET['ip']);
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if (
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empty($_GET['ip']) ||
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!preg_match('/'.IP_REGEX.'/', $_GET['ip']) ||
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$Octets[0] < 0 ||
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$Octets[0] > 255 ||
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$Octets[1] < 0 ||
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$Octets[1] > 255 ||
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$Octets[2] < 0 ||
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$Octets[2] > 255 ||
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$Octets[3] < 0 ||
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$Octets[3] > 255 ||
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/*
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* Per RFC 1918, the following CIDR blocks should never be found on the public Internet.
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* 10.0.0.0/8
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* 172.16.0.0/12
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* 192.168.0.0/16
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*
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* Per RFC 3330, the block 127.0.0.0/8 should never appear on any network.
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*
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*/
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$Octets[0] == 127 ||
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$Octets[0] == 10 ||
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($Octets[0] == 172 && ((16 <= $Octets[1]) && ($Octets[1] <= 31))) ||
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($Octets[0] == 192 && $Octets[1] == 168)
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) {
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die('Invalid IPv4 address.');
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}
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$Host = Tools::lookup_ip($_GET['ip']);
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if ($Host === '') {
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trigger_error('Tools::get_host_by_ajax() command failed with no output, ensure that the host command exists on your system and accepts the argument -W');
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} elseif ($Host === false) {
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print 'Could not retrieve host.';
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} else {
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print $Host;
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}
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