This is frox, a transparent ftp proxy by James Hollingshead.
Current features include:
o rfc959 compliant transparent proxying of ftp connections.
o active –> passive mode conversion for data connections.
o Optional caching support either locally or through an external
o Optional virus scanning
o Optional non-transparent proxy support by logging in with
o Options to bind to a specific interface, chroot, and drop
priveleges for security.