DARPA trivial file transfer protocol daemon
tftpd [directory...]
The tftpd daemon is a server that supports the DARPA Trivial File Transfer Protocol. The daemon is normally started by inetd and operates at the port indicated by the tftp entry in the services file.
Because tftp doesn't require an account or password on the remote system, tftpd will allow only publicly readable files to be accessed. Files may be written only if they already exist and are publicly writable. Note that this extends the concept of “public” to include all users on all hosts that can be reached through the network — this may not be appropriate on all systems, and its implications should be considered before enabling the tftp service. The daemon should have the user ID with the lowest possible privilege.
You can restrict access to files by including directory pathnames as arguments to tftpd in the /etc/inetd.conf file. Access will be restricted to files whose names are prefixed by one of the given directories.