Varnish developer wanted for firewall application

i would like varnish to receive real time input of a list of ip address and time .e.g. format as [ip address] [timestamp] [login to view URL] 1366416439 [login to view URL] 1366416439 [login to view URL] 1366416439 [login to view URL] 1366416439 as block list ips to be blocked, and until the duration time to release blocking. i would like varnish to show captcha message (c or c++ prefered. we can consider php or perl as well) for human verification we already have the list that generates ips for blocking real time. we would like varnish to accept this list real time. u have to suggest ways in which varnish can do so. experience with varnish 2.1.5 is required to be considered for this.