C Program to monitor traffic

I need someone to extended my C program to monitor broadcast traffic on a network. The program currently sits runs on a linux machine and captures the traffic using libpcap. It processes it and filters only the packets we want and currently prints out the MAC addresses and IPs for the broadcast packets (when there is an IP) The extension of this C application will be to add SNMP reporting to it. I want to be able to report these statistics via SNMP. Code will need to be with comments too so i can understand whats going. The second part of the project is to code up a script of your choice to display these stats using some graphing tool (probably RRDTools or something)