TFTPD(8) TFTPD(8)
28 January 1997
NAME
tftpd - Internet Trivial File Transfer Protocol server
SYNOPSIS
tftpd [ -dn ] [ -b bootptab ] directory ...
DESCRIPTION
Tftpd is a server which supports the Internet Trivial File Transfer
Protocol (RFC 783). The TFTP server operates at the port indicated in
the `tftp' service description; see services(5). The server is
normally started at bootup time. The use of tftp(1) does not require
an account or password on the remote system. Due to the lack of
authentication information, tftpd will allow only publicly readable
files to be accessed. Files containing the string ``/../'' are not
allowed. 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 tftp service. The
server should have the user ID with the lowest possible privilege.
Access to files may be restricted by invoking tftpd with a list of
directories by including up to 20 pathnames as arguments. In this
case access is restricted to files whose names are prefixed by the one
of the given directories. The given directories are also treated as a
search path for relative filename requests. Only clients listed in
the bootptab are allowed access. The options are:
-d Raise the debugging level. This also keeps tftpd from forking
and generates some extra syslog(3) messages.
-n Suppresses negative acknowledgement of requests for nonexistent
relative filenames.
-b bootptab
Specifies an alternate bootptab file. The default is
/etc/bootptab.
SEE ALSO
tftp(1)
HISTORY
The tftpd command appeared in 4.2BSD. This version is based on the
4.4BSD version which does read-ahead. It has been modified to handle
client requests in a single process. For security reasons, it does
not allow clients to write or otherwise modify data on the server.
- 1 - Formatted: December 14, 2025
