How to get user ip from user session?

[Viper]

I'm trying the next code:
$config = JFactory::getConfig();
$ip = JSession::getInstance($config->get('session_handler'), array('name'=>'__default'))->get('session.client.address');

But variable is empty. Any ideas how to get ip?

[Fedor Vlasenko]

function getIP() {
    if (getenv("HTTP_CLIENT_IP")) return getenv("HTTP_CLIENT_IP");
    if (getenv("HTTP_X_FORWARDED_FOR")) return getenv("HTTP_X_FORWARDED_FOR");
    if (getenv("REMOTE_ADDR")) return getenv("REMOTE_ADDR");
    return "UNKNOWN";
}

[Nicolay Ramm]

One comment:

Both HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR can be set to any value either by intermediate proxy servers or by the originating client itself. Only REMOTE_ADDR is set by the webserver itself, and is always the actual IP address where the request originated. This is in fact the only IP address you can know for sure in any case. I mention this because if you for example want to restrict access to a page based on IP address, REMOTE_ADDR is the only value you can rely on.

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