tftpd(8)tftpd(8)NAMEtftpd - The DARPA Trivial File Transfer Protocol (TFTP) server
SYNOPSIS
/usr/sbin/tftpd [-b] [-d] [-r pathname] [-t interval] [directory...]
OPTIONS
Instructs tftpd to not respond to broadcast requests. Specifies that
the name of the file and other debug information is sent to syslogd.
Specifies the relative pathname a user can specify to transfer a file
that has no path associated with it. For example, -r /tmp/tftp causes
/tmp/tftp to be prefixed to a file that has no path and the file is
copied to and from the directory /tmp/tftp. Only one directory path
can be specified with this option. Specifies the amount of time, in
seconds, that tftpd waits before it recognizes a connection timeout.
The default interval is 25 seconds.
DESCRIPTION
The tftpd daemon is a server that supports the DARPA (Defense Advanced
Research Projects Agency) Trivial File Transfer Protocol and complies
with RFC-1350, RFC-1782, and RFC-1783. The TFTP server operates at the
port indicated in the tftp service description; see services(4) for
more information. The server is normally started by inetd.
Using the tftp command does not require an account or password on the
remote system. Due to the lack of authentication information, the tftpd
daemon will allow only publicly readable files to be accessed. Files
containing the string /../ or starting with are not allowed. Files can
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 appro‐
priate on all systems, and its implication should be considered before
enabling tftp service. The server should have the user ID with the low‐
est possible privilege.
Access to files may be restricted by invoking the tftpd daemon with a
list of directories and including pathnames as server program arguments
in the /etc/inetd.conf file. In this case, access is restricted to
files whose names are prefixed by the one of the given directories.
The tftpd daemon validates the files that it has to transfer against
the /etc/tftptab file. If you are transferring files that are not pub‐
licly readable or not in the directories listed on the command line,
you must make certain that those files are listed in the /etc/tftptab
file.
The tftpd daemon also supports the TFTP blocksize option and option
extension that enables it to transfer files using blocksizes greater
than 512 bytes (maximum is 65464 bytes).
RESTRICTIONS
The maximum number of directories allowed in the directory list are 62.
The maximum number of files allowed in /etc/tftptab file is 256.
FILES
Specifies the command path.
SEE ALSO
Commands: tftp(1)
Daemons: inetd(8)
RFC 1782, TFTP Option Extension; G. Malkin, A. Harkin; March 1995.
RFC 1783, TFTP Blocksize Option; G. Malkin, A. Harkin; March 1995
tftpd(8)
