TFTPD(8) OpenBSD System Manager's Manual TFTPD(8)
tftpd - DARPA Trivial File Transfer Protocol server
tftpd [directory ...]
tftpd [-cs] [directory]
tftpd is a server which supports the DARPA Trivial File Transfer Proto-
col. The TFTP server operates at the port indicated in the `tftp' ser-
vice description; see services(5). The server is normally started by
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 may be written only
if they already exist and are publicly writable, unless the -c flag is
specified (see below). Note that this extends the concept of ``public''
to include all users on all hosts that can be reached through the net-
work; 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,
unless the -s flag is specified (see below), in which case it must be
started with user ID 0.
Access to files may be restricted by invoking tftpd with a list of direc-
tories by including pathnames as server program arguments in
/etc/inetd.conf. In this case access is restricted to files whose names
are prefixed by one of the given directories.
The options are as follows:
-c If the -c flag is used, tftpd will allow new files to be created;
otherwise uploaded files must already exist. Files are created
with default permissions allowing anyone to read or write to
-s When using the -s flag with a directory name, tftpd will
chroot(2) on startup; therefore the remote host is not expected
to pass the directory as part of the file name to transfer. This
option is intended primarily for compatibility with SunOS boot
ROMs which do not include a directory name.
tftp(1), inetd(8), pxeboot(8)
The tftpd command appeared in 4.2BSD.
The -s flag appeared in NetBSD 0.9a.
The -c flag was added in OpenBSD 2.1.
This implementation of tftpd does not support blocksize negotiation (RFC
1783), so files larger than 33488896 octets (65535 blocks) cannot be
Many TFTP clients will not transfer files over 16744448 octets (32767
OpenBSD 3.6 June 11, 1997 1