allowing access to php page by IP

From: Adam Williams (awilliam_at_mdah.state.ms.us)
Date: 10/07/03 

Date: Tue, 7 Oct 2003 09:23:16 -0500 (CDT)
To: php-general@lists.php.net

Hello,

I want to allow access to a php page but am not sure how I should verify
the IP once I get it. I want to allow 10.8.4.* and 10.8.5.* to access a
certain webpage and keep everyone else out. I have written code to figure
out what someone's IP is, but am not sure about how I should verify
whether the IP is in the range of 10.8.4.* or 10.8.5.*. Any suggestions?
I was thinking of either using a regex (but I dunno regex so I'd have to
learn it) to stip off the .* octect and then compare the rest of the IP
and see if its either 10.8.4 or 10.8.5, or create a for loop and loop
through 1-254 and cat it to the end of 10.8.4. and 10.8.5. and compare it
to the IP they are coming from. Any suggestions on how I should do it?

Here is the code I have to get the IP:

if (getenv("HTTP_CLIENT_IP"))
{
$ip = getenv("HTTP_CLIENT_IP");
}
elseif (getenv("HTTP_X_FORWARDED_FOR"))
{
$ip = getenv("HTTP_X_FORWARDED_FOR");
}
elseif (getenv("REMOTE_ADDR"))
{
$ip = getenv("REMOTE_ADDR");
}
else $ip = "UNKNOWN";

                        Thanks,
                        Adam

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