.\" $NetBSD: tftp.1,v 1.18 2003/08/07 11:16:14 agc Exp $ .\" .\" Copyright (c) 1990, 1993, 1994 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)tftp.1 8.2 (Berkeley) 4/18/94 .\" $FreeBSD: src/usr.bin/tftp/tftp.1,v 1.20 2007/11/07 07:56:57 ru Exp $ .\" .Dd June 11, 2003 .Dt TFTP 1 .Os .Sh NAME .Nm tftp .Nd "trivial file transfer program" .Sh SYNOPSIS .Nm .Op Fl e .Op Ar host .Op Ar port .Sh DESCRIPTION The .Nm utility is the user interface to the Internet .Tn TFTP (Trivial File Transfer Protocol), which allows users to transfer files to and from a remote machine. The remote .Ar host (and optional .Ar port ) may be specified on the command line, in which case .Nm uses .Ar host (and .Ar port ) as the default for future transfers (see the .Cm connect command below). .Pp The optional .Fl e argument sets a binary transfer mode as well as setting the extended options as if .Cm tout , .Cm tsize , and .Cm blksize 65464 , had been given. .Sh COMMANDS Once .Nm is running, it issues the prompt .Ql tftp\*[Gt] and recognizes the following commands: .Pp .Bl -tag -width verbose -compact .It Cm \&? Ar command-name ... Print help information. .Pp .It Cm ascii Shorthand for .Ic mode Cm ascii . .Pp .It Cm binary Shorthand for .Ic mode Cm binary . .Pp .It Cm blksize Ar blk-size Set the tftp blksize option to .Ar blk-size octets (8-bit bytes). Since the number of blocks in a tftp .Cm get or .Cm put is 65535, the default block size of 512 bytes only allows a maximum of just under 32 megabytes to be transferred. The value given for .Ar blk-size must be between 8 and 65464, inclusive. Note that many servers will not respect this option. .Pp .It Cm connect Ar host-name Op Ar port Set the .Ar host (and optionally .Ar port ) for transfers. Note that the .Tn TFTP protocol, unlike the .Tn FTP protocol, does not maintain connections between transfers; thus, the .Cm connect command does not actually create a connection, but merely remembers what host is to be used for transfers. You do not have to use the .Cm connect command; the remote host can be specified as part of the .Cm get or .Cm put commands. .Pp .It Cm get Ar filename .It Cm get Ar remotename localname .It Cm get Ar file1 file2 ... fileN Get one or more files from the remote host. When using the .Ar host argument, the .Ar host will be used as default host for future transfers. If .Ar localname is specified, the file is stored locally as .Ar localname , otherwise the original filename is used. Note that it is not possible to download two files at a time, only one, three, or more than three files, at a time. .Pp To specify an IPv6 numeric address for a host, wrap it using square brackets like .Dq Li [3ffe:2900:e00c:ffee::1234] : Ns Ar file to disambiguate the colons used in the IPv6 address from the colon separating the host and the filename. .Pp .It Cm mode Ar transfer-mode Set the mode for transfers; .Ar transfer-mode may be one of .Cm ascii or .Cm binary . The default is .Cm ascii . .Pp .It Cm put Ar file .It Cm put Ar localfile remotefile .It Cm put Ar file1 file2 ... fileN remote-directory Put a file or set of files to the specified remote file or directory. The destination can be in one of two forms: a filename on the remote host, if the host has already been specified, or a string of the form .Ar hosts:filename to specify both a host and filename at the same time. If the latter form is used, the hostname specified becomes the default for future transfers. When .Ar remotename is specified, the file is stored remotely as .Ar remotename , otherwise the original filename is used. If the .Ar remote-directory argument is used, the remote host is assumed to be a .Ux machine. To specify an IPv6 numeric address for a .Ar host , see the example under the .Cm get command. .Pp .It Cm quit Exit .Nm . An end of file also exits. .Pp .It Cm rexmt Ar retransmission-timeout Set the per-packet retransmission timeout, in seconds. .Pp .It Cm status Show current status. .Pp .It Cm timeout Ar total-transmission-timeout Set the total transmission timeout, in seconds. .Pp .It Cm tout Toggle the tftp "timeout" option. If enabled, the client will pass its .Ar retransmission-timeout to the server. Note that many servers will not respect this option. .Pp .It Cm trace Toggle packet tracing. .Pp .It Cm tsize Toggle the tftp "tsize" option. If enabled, the client will pass and request the filesize of a file at the beginning of a file transfer. Note that many servers will not respect this option. .Pp .It Cm verbose Toggle verbose mode. .El .Sh HISTORY The .Nm command appeared in .Bx 4.3 . IPv6 support was implemented by WIDE/KAME project in 1999. TFTP options were implemented by Wasabi Systems, Inc., in 2003, and first appeared in .Nx 2.0 . .Sh SECURITY CONSIDERATIONS Because there is no user-login or validation within the .Tn TFTP protocol, the remote site will probably have some sort of file-access restrictions in place. The exact methods are specific to each site and therefore difficult to document here. .Pp Files larger than 33488896 octets (65535 blocks) cannot be transferred without client and server supporting blocksize negotiation (RFC1783).