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.
4. 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: releng/10.2/usr.bin/tftp/tftp.1 235211 2012-05-10 02:07:00Z gjb $
.Dd June 22, 2011 .Dt TFTP 1 .Os .Sh NAME .Nm tftp .Nd trivial file transfer program .Sh SYNOPSIS .Nm .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 may be specified on the command line, in which case .Nm uses .Ar host as the default host for future transfers (see the .Cm connect command below). .Sh COMMANDS Once .Nm is running, it issues the prompt .Dq Li tftp> and recognizes the following commands:
p l -tag -width verbose -compact t Cm ? Ar command-name ... Print help information.
p t Cm ascii Shorthand for "mode ascii"
p t Cm binary Shorthand for "mode binary"
p t Cm blocksize Ar [size] Sets the TFTP blksize option in TFTP Read Request or Write Request packets to .Ar [size] as specified in RFC 2348. Valid values are between 8 and 65464. If no blocksize is specified, then by default a blocksize of 512 bytes will be used.
p t Cm blocksize2 Ar [size] Sets the TFTP blksize2 option in TFTP Read Request or Write Request packets to .Ar [size] . Values are restricted to powers of 2 between 8 and 32768. This is a non-standard TFTP option.
p t Cm connect Ar host 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.
p t Cm debug Ar level Enable or disable debugging levels during verbose output. The value of .Ar level can be one of .Cm packet , simple , options , or .Cm access .
p t Cm get Oo Ar host : Oc Ns Ar file Op Ar localname t Cm get Xo .Oo Ar host1 : Oc Ns Ar file1 .Oo Ar host2 : Oc Ns Ar file2 ... .Oo Ar hostN : Oc Ns Ar fileN .Xc 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.
p 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.
p t Cm mode Ar transfer-mode Set the mode for transfers; .Ar transfer-mode may be one of .Em ascii or .Em binary . The default is .Em ascii .
p t Cm packetdrop [arg] Randomly drop .Ar arg out of 100 packets during a transfer. This is a debugging feature.
p t Cm put Ar file Op Oo Ar host : Oc Ns Ar remotename t Cm put Ar file1 file2 ... fileN Op Oo Ar host : Oc Ns Ar remote-directory Put a file or set of files to the remote host. 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 x machine. To specify an IPv6 numeric address for a .Ar host , see the example under the .Cm get command.
p t Cm options Ar [arg] Enable or disable support for TFTP options. The valid values of .Ar arg are .Cm on (enable RFC 2347 options), .Cm off (disable RFC 2347 options), and .Cm extra (toggle support for non-RFC defined options).
p t Cm quit Exit .Nm . An end of file also exits.
p t Cm rexmt Ar retransmission-timeout Set the per-packet retransmission timeout, in seconds.
p t Cm rollover [arg] Specify the rollover option in TFTP Read Request or Write Request packets. After 65535 packets have been transmitted, set the block counter to .Ar arg . Valid values of .Ar arg are 0 and 1. This is a non-standard TFTP option.
p t Cm status Show current status.
p t Cm timeout Ar total-transmission-timeout Set the total transmission timeout, in seconds.
p t Cm trace Toggle packet tracing.
p t Cm verbose Toggle verbose mode. .El .Sh SEE ALSO .Xr tftpd 8
p The following RFC's are supported: .Rs .%T RFC 1350: The TFTP Protocol (Revision 2) .Re .Rs .%T RFC 2347: TFTP Option Extension .Re .Rs .%T RFC 2348: TFTP Blocksize Option .Re .Rs .%T RFC 2349: TFTP Timeout Interval and Transfer Size Options .Re .Rs .%T RFC 3617: Uniform Resource Identifier (URI) Scheme and Applicability Statement for the Trivial File Transfer Protocol (TFTP) .Re
p The non-standard .Cm rollover and .Cm blksize2 TFTP options are mentioned here: .Rs .%T Extending TFTP .%U http://www.compuphase.com/tftp.htm .Re .Sh HISTORY The .Nm command appeared in x 4.3 .
p Edwin Groothuis <edwin@FreeBSD.org> performed a major rewrite of the .Xr tftpd 8 and .Nm code to support RFC2348. .Sh NOTES 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.
p Files larger than 33488896 octets (65535 blocks) cannot be transferred without client and server supporting the TFTP blocksize option (RFC2348), or the non-standard TFTP rollover option.