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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), tftp-proxy(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 3.9                      June 11, 1997                               1


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