RFC949 - FTP unique-named store command

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　　Network Working Group Mike Padlipsky
Request for Comments: 949 Mitre
Semisupersedes RFC505 July 1985

FTP UNIQUE-NAMED STORE COMMAND

STATUS OF THIS MEMO

This RFCproposes an extension to the File Transfer Protocol for the
ARPA-Inte.net community, and requests discussion and suggestions for
improvements. Distribution of this memo is unlimited.

DISCUSSION

There are various contexts in which it would be desirable to have an
FTP command that had the effect of the present STOR but rather than
requiring the sender to specify a file name instead caused the
resultant file to have a unique name relative to the current
directory. This would be useful for all sorts of "pool" directories;
the directories that serve as queues for printer daemons come
immediately to mind (so do fax and even cardpunch daemons' queues),
although naturally the sort of printer queue that a local command has
to manage the interface to isn't what's meant by "pool" in this
context.

If we accept the need for such an FTP extension, and that it should
not be done with an "X" command because it needs to be relied on
"everywhere," the interesting question then becomes how to mechanize
it. Probably the most natural way to do it would be either to add a
"control argument" of -UNM to the syntax of STOR, now that there are
enough UNIXtm's around so that this good old Multics trick isn't
alien any more, or even to declare that STOR with no argument should
cause a directory-unique name to be generated. However, either of
these would necessitate "reopening" the STOR command code, which is a
distasteful sort of exercise. Since most FTP's presumably do a
dispatch sort of thing off a list of command names to begin with,
then, an additional command would seem to be the way to go.

Naming the command calls for a bit of thought. STore Uniquely Named
(-> STUN) is silly; UNIQue comes to close to free advertising or even
trademark infringement (and confuses fingers if you're typing); Store
Uniquely NaMed (-> SUNM) doesn't avoid free advertising either;
Uniquely Named STore (-> UNST) might look like a synonym for DELEte,
though it's not all that bad; SToRe Uniquely named (-> STRU) is
taken; and so it goes. The best bet seems to be STOU.

Of somewhat more practical import, there's also the question of
whether the sender needs to be apprised of what the unique name
turned out to be. Intuitively, sometimes this would be the case and
sometimes it wouldn't. Making it optional is almost certainly too

RFC949 July 1985
FTP Unique-Named Store Command

much like work, though--even if it does have the subtle virtue of
finally getting control arguments into FTP. Therefore, why not just
include it in a suitable response-code's free text field (unless, of
course, an avalanche of comments comes in urging it not be done at
all)?

Note, by the way, that the intent here is emphatically not to
sidestep whatever access control, authentication, and accounting
mechanisms Hosts might have in play before the user can do an old
STOR or a new STOU, but with suitable publicized ID's and passwords
it could be almost as good as the proposal made in RFC505.

RECOMMENDATION

Add a new command, STOU, to FTP, which behaves like STOR except that
the resultant file is to be created in the current directory under a
name unique to that directory. The 250 Transfer Started response
should include the name generated (unless the copy of FTP I have is
so old that 250 isn't the right number any more).

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