Vbulletin Extension to handle each request comes to Vbulletin site.

[npadbidri]

Hi,

I want to make vbulletin extension which will work like a proxy for vbulletin site.
Each request which comes to vbulletin site like request for 'Home page' should first comes to my extension and
then depending on the logic I will redirect to 'Home page'.

I want this extension because I need to authenticate the user first and then if user is valid, it will get redirected to 'Home page'
otherwise redirect to log in page.

Please let me know it is possible or not.
If possible then how we can do this?

If there is another way to do this then please let me know that as well.
So any help would be greatly appreciated.
Thanks!!!