tftpd

TFTPD(8)                OpenBSD System Manager's Manual               TFTPD(8)

NAME

     tftpd - DARPA Trivial File Transfer Protocol server

SYNOPSIS

     tftpd [-cl] [directory ...]
     tftpd [-cl] -s directory

DESCRIPTION

     tftpd is a server which supports the DARPA Trivial File Transfer
     Protocol.  The TFTP server operates at the port indicated in the `tftp'
     service description; see services(5).  The server is normally started by
     inetd(8).

     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
     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,
     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
     directories 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      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 them.

     -l      Log the client IP, type of request, and filename using syslog(3)
             with a level of LOG_INFO.

     -s directory
             chroot(2) to directory on startup; 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.

SEE ALSO

     tftp(1), inetd(8), pxeboot(8), syslogd(8), tftp-proxy(8)

HISTORY

     The tftpd command appeared in 4.2BSD.

     The -s flag appeared in NetBSD 0.9a.

     The -c flag was added in OpenBSD 2.1.

     The -l flag was added in OpenBSD 4.3.

BUGS

     Many TFTP clients will not transfer files over 16744448 octets (32767
     blocks).

OpenBSD 5.1                    November 14, 2008                   OpenBSD 5.1