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140 lines
4.3 KiB
Groff
140 lines
4.3 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)tftpd.8 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt TFTPD 8
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.Os BSD 4.2
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.Sh NAME
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.Nm tftpd
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.Nd
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Internet Trivial File Transfer Protocol server
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.Sh SYNOPSIS
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.Nm /usr/libexec/tftpd
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.Op Fl l
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.Op Fl n
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.Op Fl s Ar directory
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.Op Ar directory ...
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.Sh DESCRIPTION
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.Nm Tftpd
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is a server which supports the
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Internet Trivial File Transfer
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Protocol (\c
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.Tn RFC 783).
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The
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.Tn TFTP
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server operates
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at the port indicated in the
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.Ql tftp
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service description;
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see
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.Xr services 5 .
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The server is normally started by
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.Xr inetd 8 .
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.Pp
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The use of
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.Xr tftp 1
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does not require an account or password on the remote system.
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Due to the lack of authentication information,
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.Nm
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will allow only publicly readable files to be
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accessed.
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Files containing the string ``/\|\fB.\|.\fP\|/'' or starting with
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``\|\fB.\|.\fP\|/'' are not allowed.
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Files may be written only if they already exist and are publicly writable.
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Note that this extends the concept of
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.Dq public
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to include
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all users on all hosts that can be reached through the network;
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this may not be appropriate on all systems, and its implications
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should be considered before enabling tftp service.
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The server should have the user ID with the lowest possible privilege.
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.Pp
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Access to files may be restricted by invoking
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.Nm
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with a list of directories by including up to 20 pathnames
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as server program arguments in
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.Pa /etc/inetd.conf .
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In this case access is restricted to files whose
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names are prefixed by the one of the given directories.
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The given directories are also treated as a search path for
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relative filename requests.
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.Pp
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The chroot option provides additional security by restricting access
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of
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.Nm
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to only a chroot'd file system. This is useful when moving
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from an OS that supported
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.Fl s
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as a boot server. Because chroot is restricted to root, you must run
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.Nm
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as root. However, if you chroot, then
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.Nm
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will set its user id to nobody.
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.Pp
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The options are:
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.Bl -tag -width Ds
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.It Fl l
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Log all requests using
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.Xr syslog 3
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with the facility of LOG_FTP. Note: Logging of LOG_FTP messages
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will also need to be enabled in the syslog configuration file
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.Xr syslog.conf 5 .
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.It Fl n
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Suppress negative acknowledgement of requests for nonexistent
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relative filenames.
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.It Fl s Ar directory
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Cause
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.Nm
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to chroot to
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.Pa directory
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before accepting commands. In addition, the user id is set to
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nobody.
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.Pp
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If you are not running
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.Fl s ,
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no user id change will be
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attempted. You should not run
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.Nm
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as root unless you are using
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.Fl s .
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.El
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.Sh SEE ALSO
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.Xr tftp 1 ,
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.Xr inetd 8 ,
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.Xr syslogd 8
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.2 .
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