<?php
// File name:	geoip.inc.php
// Description:	PHP subroutine to query GeoIP
// Date:	2004-11-21
// Author:	imacat <imacat@pristine.com.tw>
// Copyright:	Copyright (C) 2004-2007 Pristine Communications

// Set the include path
if (!defined("INCPATH_SET")) {
    require_once dirname(__FILE__) . "/incpath.inc.php";
}
// Referenced subroutines
require_once "GeoIP/geoip.inc";
require_once "monica/cgiemu.inc.php";
require_once "monica/ipv4addr.inc.php";

// Settings
define("GEOIP_DAT", "/usr/share/GeoIP/GeoIP.dat");
define("GEOIP_CT_PRIVATE_NETWORK", "AA");

// geoiplookup: Query GeoIP for an IP
function geoiplookup($ip = null)
{
    // Default to the client address
    if (is_null($ip)) {
        $ip = $_SERVER["REMOTE_ADDR"];
    }
    // Cache the handler
    static $gi;
    if (!isset($gi)) {
        $gi = geoip_open(GEOIP_DAT, GEOIP_STANDARD);
    }
    // Look up in the GeoIP database
    $ct = geoip_country_code_by_addr($gi, $ip);
    if ($ct != "") {
        return $ct;
    }
    // Check if it is in a private network
    if (    ipv4_in_network("127.0.0.1/8", $ip)
            || ipv4_in_network("10.0.0.0/8", $ip)
            || ipv4_in_network("172.16.0.0/12", $ip)
            || ipv4_in_network("192.168.0.0/16", $ip)) {
        return GEOIP_CT_PRIVATE_NETWORK;
    }
    // Not found at all
    return null;
}

?>