nfsniff is a simple proof-of-concept of a kernel-based FTP password sniffer. A captured Username and Password pair are sent to a remote host when that host sends a specially formatted ICMP packet. This software was originally developed by bioforge in 2003
and was then migrated from Linux 2.4 to 2.6 by me in 2007 for a class of my Computer Sciences and Engineering Bachelor.
Download source-code: nfsniff-dec2007.tar.bz2