Develop a login based DHCP access system for hotspot [closed]

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Say I have a wifi hotspot which allows users access to my net connection (similar to a public hotspot).

Now, when a user connects to said hotspot, he must be redirected to a login page and if credentials are correct, then he is assigned a DHCP address and can access the internet.

I want to learn how such systems are implemented at public hotspots such as Starbucks, McDonalds, etc.

Can such a page be made with PHP or Java?

Answer 1

Oh well, I found this. Got what I was looking for.

http://www.andybev.com/index.php/Using_iptables_and_PHP_to_create_a_captive_portal