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How To Retrieve Client Ip Address

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  #1  
Old June 3rd, 2003, 10:44 AM
paulsiew2 paulsiew2 is offline
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How To Retrieve Client Ip Address
Hi,

Anyone know how to retrieve Client's IP Address, my php webserver was behind the proxy (firewall)?
When i use --> $REMOTE_ADDR , show my proxy's IP address..
$HTTP_X_FORWARDED_FOR , show nothing

Javascript below only works for Netscape, return nothing in IE,

<script language="JavaScript"><!--
if (navigator.appName=='Netscape' && navigator.javaEnabled()) {
hn = java.net.InetAddress.getLocalHost().getHostName();
ha = java.net.InetAddress.getLocalHost().getHostAddress();
document.write('HostName: '+ hn + '<br>' + 'HostAddress: '+ ha );
}
//--></script>


Thanks in Advance!


PauL
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  #2  
Old June 3rd, 2003, 11:15 AM
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You cannot depend upon any method to get the IP address. Some proxies just will not send it at all.

Shouldn't this be in the PHP or Javascript forum? What kind of solution (client or server side) do you want?

---John Holmes...
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  #3  
Old June 4th, 2003, 09:04 PM
paulsiew2 paulsiew2 is offline
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Sorry..Wrong forum!
As stated above, i need to get client's ip address, any method...pls
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  #4  
Old June 4th, 2003, 09:43 PM
Chameleon Chameleon is offline
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Well there isn't a 100% reliable way to do it due to proxy servers, etc...
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  #5  
Old June 4th, 2003, 09:53 PM
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Why do you think you need to get the IP address?
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Old June 5th, 2003, 12:45 PM
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Hi,

Usually proxies send the real client IP via a HTTP proxy header (usually HTTP_CLIENT_IP or HTTP_X_FORWARDED_FOR).

So you should always attempt to extract the real client IP and use it instead of the proxy IP. Remember - sometimes it's impossible (anonymous proxies) - and no matter what you do - you'll always get the IP of the proxy.

Try using this function to get the client IP, instead of REMOTE_ADDR or anything similar.

PHP Code:
<?
function get_client_ip ()
{
    // Get REMOTE_ADDR as the Client IP.
    $client_ip = ( !empty($_SERVER['REMOTE_ADDR']) ) ? $_SERVER['REMOTE_ADDR'] : ( ( !empty($_ENV['REMOTE_ADDR']) ) ? $_ENV['REMOTE_ADDR'] : $REMOTE_ADDR );

    // Check for headers used by proxy servers to send the Client IP. We should look for HTTP_CLIENT_IP before HTTP_X_FORWARDED_FOR.
    if ($_SERVER["HTTP_CLIENT_IP"])
        $proxy_ip = $_SERVER["HTTP_CLIENT_IP"];
    elseif ($_SERVER["HTTP_X_FORWARDED_FOR"])
        $proxy_ip = $_SERVER["HTTP_X_FORWARDED_FOR"];

    // Proxy is used, see if the specified Client IP is valid. Sometimes it's 10.x.x.x or 127.x.x.x... Just making sure.
    if ($proxy_ip)
    {
        if ( preg_match("/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/", $proxy_ip, $ip_list) )
        {
            $private_ip = array('/^0\./', '/^127\.0\.0\.1/', '/^192\.168\..*/', '/^172\.16\..*/', '/^10.\.*/', '/^224.\.*/', '/^240.\.*/');
            $client_ip = preg_replace($private_ip, $client_ip, $ip_list[1]);
        }
    }

    // Return the Client IP.
    return $client_ip;
}
?>


Aviv Shaham
Think Offshore, Inc.
http://www.think-offshore.com
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  #7  
Old June 5th, 2003, 12:57 PM
ngahleng ngahleng is offline
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try echo phpinfo(); see what u can get.
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  #8  
Old June 5th, 2003, 09:36 PM
paulsiew2 paulsiew2 is offline
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Unhappy
it still showing the proxy ip address
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  #9  
Old June 5th, 2003, 09:50 PM
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Listen to Sepo

Quote:
You cannot depend upon any method to get the IP address. Some proxies just will not send it at all.
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Old June 5th, 2003, 09:59 PM
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Old June 5th, 2003, 10:12 PM
paulsiew2 paulsiew2 is offline
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Quote:
Originally posted by SepodatiCreations
You cannot depend upon any method to get the IP address. Some proxies just will not send it at all.

Shouldn't this be in the PHP or Javascript forum? What kind of solution (client or server side) do you want?

---John Holmes...



yup..it might not work at server site, that's y i'm looking for client site scripts like Javascript or VBScript, those script post the ip back as a parameter to my php..but no luck
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Old June 5th, 2003, 10:26 PM
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Old June 5th, 2003, 10:46 PM
paulsiew2 paulsiew2 is offline
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tried the script..not working..
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