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freebsd/usr.bin/tftp/tftp.1
Warner Losh 752fa69402 Go ahead and merge the work edwin@ on tftpd into the tree. It is a 
lot better than what's in the tree now.  Edwin tested it at a prior
employer, but can't test it today.  I've found that it works a lot
better with the various uboot versions that I've used in my embedded
work.  Here's the pkg-descr from the port that describes the changes:

It all started when we got some new routers, which told me the
following when trying to upload configuration or download images
from it: The TFTP server doesn't support the blocksize option.

My curiousity was triggered, it took me some reading of RFCs and
other documentation to find out what was possible and what could
be done. Was plain TFTP very simple in its handshake, TFTP with
options was kind of messy because of its backwards capability: The
first packet returned could either be an acknowledgement of options,
or the first data packet.

Going through the source code of src/libexec/tftpd and going through
the code of src/usr.bin/tftp showed that there was a lot of duplicate
code, and the addition of options would only increase the amount
of duplicate code. After all, both the client and the server can
act as a sender and receiver.

At the end, it ended up with a nearly complete rewrite of the tftp
client and server. It has been tested against the following TFTP
clients and servers:

- Itself (yay!)
- The standard FreeBSD tftp client and server
- The Fedora Core 6 tftp client and server
- Cisco router tftp client
- Extreme Networks tftp client

It supports the following RFCs:

RFC1350 - THE TFTP PROTOCOL (REVISION 2)
RFC2347 - TFTP Option Extension
RFC2348 - TFTP Blocksize Option
RFC2349 - TFTP Timeout Interval and Transfer Size Options
RFC3617 - Uniform Resource Identifier (URI) Scheme and Applicability
          Statement for the Trivial File Transfer Protocol (TFTP)

It supports the following unofficial TFTP Options as described at
http://www.compuphase.com/tftp.htm:

blksize2 - Block size restricted to powers of 2, excluding protocol headers
rollover - Block counter roll-over (roll back to zero or to one)

From the tftp program point of view the following things are changed:

- New commands: "blocksize", "blocksize2", "rollover" and "options"
- Development features: "debug" and "packetdrop"

If you try this tftp/tftpd implementation, please let me know if
it works (or doesn't work) and against which implementaion so I can
get a list of confirmed working systems.

Author: Edwin Groothuis <edwin@FreeBSD.org>
2010-05-04 06:13:17 +00:00

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.\" Copyright (c) 1990, 1993, 1994
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.\" without specific prior written permission.
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.\" SUCH DAMAGE.
.\"
.\" @(#)tftp.1 8.2 (Berkeley) 4/18/94
.\" $FreeBSD$
.\"
.Dd October 1, 2003
.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:
.Pp
.Bl -tag -width verbose -compact
.It Cm \&? Ar command-name ...
Print help information.
.Pp
.It Cm ascii
Shorthand for "mode ascii"
.Pp
.It Cm binary
Shorthand for "mode binary"
.Pp
.It 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.
.Pp
.It Cm get Oo Ar host : Oc Ns Ar file Op Ar localname
.It 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.
.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
.Em ascii
or
.Em binary .
The default is
.Em ascii .
.Pp
.It Cm put Ar file Op Oo Ar host : Oc Ns Ar remotename
.It 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
.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 trace
Toggle packet tracing.
.Pp
.It Cm verbose
Toggle verbose mode.
.El
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.3 .
.Sh BUGS
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).
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