Andrew Senyshyn wrote:
> Hi all,
>
> I need to get local user IP, but server with apache and php is in
> another subnetwork.
> So from server environment I can get only router's IP.
> The only solution that I see - is getting with some magic algorithm
> local IP from brouser and sending it to server.
> My application is for intranet, so I don't see any reason to make users
> authorization.
> Any ideas for this?
you can't always get the real users IP because of proxies, anonimizers,
firewalls/gateways
[on the user end] (and don't bother using an IP as an absolute indicator when
validating a
session - you can use it as one of a number of metrics - for instance AOL users
have their
IP addresses changed roughly every 300 milliseconds).
nonetheless here are a couple of funcs that might help you (at least to
understand
what is possible it terms of trying to determine a users IP):
/* Determine if an ip is in a net.
* E.G. 120.120.120.120 in 120.120.0.0/16
*/
function isIPInSubnet($ip, $net, $mask)
{
$firstpart = substr(str_pad(decbin(ip2long($net)), 32, "0", STR_PAD_LEFT)
,0 , $mask);
$firstip = substr(str_pad(decbin(ip2long($ip)), 32, "0", STR_PAD_LEFT),
0, $mask);
return (strcmp($firstpart, $firstip) == 0);
}
/* This function check if a ip is in an array of nets (ip and mask) */
function isPrivateIP($theip)
{
foreach (array("10.0.0.0/8",
"172.16.0.0/12",
"192.168.0.0/16") as $subnet)
{
list($net, $mask) = explode('/', $subnet);
if(isIPInSubnet($theip,$net,$mask)) {
return true;
}
}
return false;
}
/* Building the ip array with the HTTP_X_FORWARDED_FOR and REMOTE_ADDR HTTP
vars.
* With this function we get an array where first are the ip's listed in
* HTTP_X_FORWARDED_FOR and the last ip is the REMOTE_ADDR
*/
function getRequestIPs()
{
$ipList = array();
foreach (array('HTTP_X_FORWARDED_FOR', 'HTTP_FORWARDED_FOR', 'REMOTE_ADDR')
as $key) {
if (isset($_SERVER[$key]) && $_SERVER[$key]) {
$ipList = array_merge($ipList, explode(',', $_SERVER[$key]));
break;
}
}
return $ipList;
}
/* try hard to determine whAt the users/clients public IP address is */
function getRequestIP($allowPrivIPs = false)
{
foreach (getRequestIPs() as $ip) {
if($ip && ($allowPrivIPs === true || !isPrivateIP($ip))) {
return $ip;
}
}
return 'unknown';
}
> thanks beforehand
>
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