pdnsd and dial-up connections

[Ross Burton <ross.burton@mail.com>]

Hi, 

I want to set up pdnsd (the persistant caching DNS daemon) on my
machine, which is connected to the net via a dial-up connection.
However, the DNS servers are specified at connection time and I also use
several dial-up providers, so I would like to be able to pass the DNS
servers aquired from the PPP connection into pdnsd so that it uses the
correct servers. 

Has anyone figured out a way of cleanly telling pdnsd the address of the
new 
servers when a PPP connection starts? 

Thanks for any help, 
Ross