DHCP script for zcip package

Below is a script I've created to link the DHCP client and zcip
together, so that if no DHCP server is available the machine still ends
up with a usable IP address. I was trying to bring about the use case
where two wireless laptop users get together and want to exchange files.

I'm using the script on Ubuntu 5.04, so I've named it  
/etc/dhcp3/dhclient-exit-hooks.d/zeroconf
I'm not sure it's the best way to do things, and it currently works
badly if you have more than one interface, but it does work. (Comments
and feedback most welcome!)

Reading the drafts on auto-configuration I see that one suggestion is to
have an auto-configured address along with a dhcp-supplied address, but
I don't know enough about linux device configuration to create aliases
yet!

Has all this been done before and I just haven't found the right
packages to install, or is standalone networking just something which
linux users haven't had the need for yet? Personally I can't wait for
the day my linux laptop can join an ad-hoc network and offer up
websites, file-transfer and chat.

-Kevin

#!/bin/sh
# Script to allocate ourselves an IP address if no DHCP server available
# Written June 2005 by Kevin Steen ([email protected])
#
# Requires zcip to be installed
# 
# ToDo:
# + Once zcip supports it, get zcip to write its pid to a file so we can
#   kill the correct instance.

allocate_address() {
	if [ "$reason" == BOUND ]; then
	   killall zcip ;
	elif [ "$reason" == FAIL ]; then
	   killall zcip
	   zcip -i $interface &
	fi
}
allocate_address
# end of script


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