1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)tftpd.8 8.1 (Berkeley) 6/4/93 33.\" 34.Dd June 4, 1993 35.Dt TFTPD 8 36.Os BSD 4.2 37.Sh NAME 38.Nm tftpd 39.Nd 40Internet Trivial File Transfer Protocol server 41.Sh SYNOPSIS 42.Nm /usr/libexec/tftpd 43.Op Fl l 44.Op Fl n 45.Op Fl s Ar directory 46.Op Ar directory ... 47.Sh DESCRIPTION 48.Nm Tftpd 49is a server which supports the 50Internet Trivial File Transfer 51Protocol (\c 52.Tn RFC 783). 53The 54.Tn TFTP 55server operates 56at the port indicated in the 57.Ql tftp 58service description; 59see 60.Xr services 5 . 61The server is normally started by 62.Xr inetd 8 . 63.Pp 64The use of 65.Xr tftp 1 66does not require an account or password on the remote system. 67Due to the lack of authentication information, 68.Nm 69will allow only publicly readable files to be 70accessed. 71Files containing the string ``/\|\fB.\|.\fP\|/'' or starting with 72``\|\fB.\|.\fP\|/'' are not allowed. 73Files may be written only if they already exist and are publicly writable. 74Note that this extends the concept of 75.Dq public 76to include 77all users on all hosts that can be reached through the network; 78this may not be appropriate on all systems, and its implications 79should be considered before enabling tftp service. 80The server should have the user ID with the lowest possible privilege. 81.Pp 82Access to files may be restricted by invoking 83.Nm 84with a list of directories by including up to 20 pathnames 85as server program arguments in 86.Pa /etc/inetd.conf . 87In this case access is restricted to files whose 88names are prefixed by the one of the given directories. 89The given directories are also treated as a search path for 90relative filename requests. 91.Pp 92The chroot option provides additional security by restricting access 93of 94.Nm 95to only a chroot'd file system. This is useful when moving 96from an OS that supported 97.Fl s 98as a boot server. Because chroot is restricted to root, you must run 99.Nm 100as root. However, if you chroot, then 101.Nm 102will set its user id to nobody. 103.Pp 104The options are: 105.Bl -tag -width Ds 106.It Fl l 107Log all requests using 108.Xr syslog 3 109with the facility of LOG_FTP. Note: Logging of LOG_FTP messages 110will also need to be enabled in the syslog configuration file 111.Xr syslog.conf 5 . 112.It Fl n 113Suppress negative acknowledgement of requests for nonexistent 114relative filenames. 115.It Fl s Ar directory 116Cause 117.Nm 118to chroot to 119.Pa directory 120before accepting commands. In addition, the user id is set to 121nobody. 122.Pp 123If you are not running 124.Fl s , 125no user id change will be 126attempted. You should not run 127.Nm 128as root unless you are using 129.Fl s . 130.El 131.Sh SEE ALSO 132.Xr tftp 1 , 133.Xr inetd 8 , 134.Xr syslogd 8 135.Sh HISTORY 136The 137.Nm 138command appeared in 139.Bx 4.2 . 140