
From wmaton@ottix.net  Sat Aug  6 10:46:31 2011
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Date: Sat, 6 Aug 2011 13:46:42 -0400 (EDT)
From: "William F. Maton" <wmaton@ottix.net>
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Subject: Re: [ftpext] OPTS UTF8 needs work (...probably in FTPEXT2)
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On Thu, 14 Jul 2011, Mykyta Yevstifeyev wrote:

> I've recently found the draft of FTPEXT WG: 
> http://tools.ietf.org/id/draft-ietf-ftpext-utf-8-option-00.txt.  It specifies 
> the mechanism to negotiate the use of UTF-8 encoded pathnames in FTP.  To my 
> knowledge, this option is currently implemented by many applications, but 
> still remain undocumented.  In order to fill this gap, I'd like to propose 
> the FTPEXT2 WG to undertake the effort to reopen the work on the document. 
> Any thoughts?

All,
 	I have spoken privately with Gregory Lundberg regarding this draft 
and has no problem haviong it revived.  He'd say so himself were it not 
for him being preoccupied with other things of a personal nature.

wfms

From john-ietf@jck.com  Sat Aug  6 14:20:16 2011
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Date: Sat, 06 Aug 2011 17:20:27 -0400
From: John C Klensin <john-ietf@jck.com>
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Subject: Re: [ftpext] OPTS UTF8 needs work (...probably in FTPEXT2)
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--On Saturday, August 06, 2011 13:46 -0400 "William F. Maton"
<wmaton@ottix.net> wrote:

> On Thu, 14 Jul 2011, Mykyta Yevstifeyev wrote:
> 
>> I've recently found the draft of FTPEXT WG: 
>> http://tools.ietf.org/id/draft-ietf-ftpext-utf-8-option-00.tx
>> t.  It specifies  the mechanism to negotiate the use of UTF-8
>> encoded pathnames in FTP.  To my  knowledge, this option is
>> currently implemented by many applications, but  still remain
>> undocumented.  In order to fill this gap, I'd like to propose 
>> the FTPEXT2 WG to undertake the effort to reopen the work on
>> the document.  Any thoughts?
> 
> All,
>  	I have spoken privately with Gregory Lundberg regarding this
> draft and has no problem haviong it revived.  He'd say so
> himself were it not for him being preoccupied with other
> things of a personal nature.

Hmm.

I had glanced at RFC 2640 when I started to put the typeu spec
(now draft-ietf-ftpext2-typeu) together and assumed that it was
adequate.  This I-D makes a fairly persuasive argument that it
is not.  Despite that, I caught a significant error or two  in
this spec... but they are easily corrected.

If we want to be parsimonious about extensions, it might be
worthwhile to fold the protocol parts of this in together with
typeu, creating a single i18n extension or at least a single
i18n document.   That would probably make it useful to pull the
rationale for why 2640 is not adequate (IMO a nice piece of
work, fwiw) into a separate informational document.

That leads to two questions for the WG:

(1) Is there really justification for two separate extensions,
one to permit talking with file systems that use characters
outside the ASCII repertoire and one to permit canonical-form
transfer of UTF-8 text files?   Or can we get away with a single
UTF-8 extension.

(2) What is the actual implementation and deployment status of
either draft-ietf-ftpext-utf-8-option-00 and of unmodified RFC
2640 implementations?  In particular, would a single i18n
extension be a significant issue for the installed base?

     john



From cowan@ccil.org  Mon Aug  8 18:13:17 2011
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Subject: Re: [ftpext] FWD: I-D Action:	draft-yevstifeyev-ftp-uri-scheme-05.txt
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John C Klensin scripsit:

> It seems to me that there are two logical possibilities for an
> FTP URI:
> 
> (a) Do something absolutely minimal that satisfies a large
> number of cases.  This is probably anonymous login only, stream
> and image transfer only, probably PASV only these days, maybe
> even a restriction to an ASCII command stream.  If an email
> address is needed for login, a provision for picking that up
> from an environment variable rather than having it incorporated
> into the URI, would be important.
> 
> (b) Fully-reflect the protocol and all of its standardized
> options.  This would get fairly complex for a URI because one
> would not only want to supply a lot of information but might
> want to supply it conditionally.

The third possibility is to describe what actually works on the
browsers and other URI-basec clients that are actually in use,
which I believe is what is being done.

> Between those two points, there isn't a lot other than slippery
> slope.

A slippery slope is where people actually live.

-- 
One Word to write them all,             John Cowan <cowan@ccil.org>
  One Access to find them,              http://www.ccil.org/~cowan
One Excel to count them all,
  And thus to Windows bind them.                --Mike Champion

From barryleiba.mailing.lists@gmail.com  Tue Aug  9 11:51:39 2011
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Subject: Re: [ftpext] [apps-discuss] FWD: I-D Action: draft-yevstifeyev-ftp-uri-scheme-05.txt
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It's been a week and a half since the original message was posted, but
I had to discuss this with the other appsawg chairs, the ftpext2
chairs, and the Applications ADs.

On Sun, Jul 31, 2011 at 12:39 AM, Mykyta Yevstifeyev
<evnikita2@gmail.com> wrote:
> Sorry for cross-posting to 6 addresses :-); please send all your comments=
 to
> apps-discuss@ietf.org.

No, please do not.  This document is NOT to be discussed on apps-discuss.
1. It will not be processed in the appsawg.
2. The ftpext2 chairs have told me that it will not be processed in
ftpext2.  It is not in their charter, and the WG is not interested in
rechartering to add it.
3. The Apps ADs have told me that they will not sponsor it as an
individual submission.

In other words, as an IETF document, this is dead.  There is
insufficient energy and interest in the IETF to hash this document
out.  Please do not continue work on this document.  In any case,
please do not discuss it on the apps-discuss mailing list.

Barry Leiba, appsawg chair

>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>>
>> =A0 =A0 =A0 =A0Title =A0 =A0 =A0 =A0 =A0 : The&#39;ftp&#39; URI Scheme
>> =A0 =A0 =A0 =A0Author(s) =A0 =A0 =A0 : Mykyta Yevstifeyev
>> =A0 =A0 =A0 =A0Filename =A0 =A0 =A0 =A0: draft-yevstifeyev-ftp-uri-schem=
e-05.txt
>> =A0 =A0 =A0 =A0Pages =A0 =A0 =A0 =A0 =A0 : 29
>> =A0 =A0 =A0 =A0Date =A0 =A0 =A0 =A0 =A0 =A0: 2011-07-24
>>
>> =A0 =A0This document specifies the&#39;ftp&#39; Uniform Resource Identif=
ier
>> (URI)
>> =A0 =A0scheme, which is used to refer to resources accessible via File
>> =A0 =A0Transfer Protocol (FTP). =A0It updates RFC 959 and RFC 1738.
>>
>> A URL for this Internet-Draft is:
>> http://www.ietf.org/internet-drafts/draft-yevstifeyev-ftp-uri-scheme-05.=
txt

From hmdmhdfmhdjmzdtjmzdtzktdkztdjz@gmail.com  Wed Aug 10 04:26:01 2011
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Subject: [ftpext] ftpext2-typeu-02
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Hi, I've read the "hash" and "typeu" drafts.  The former only looking for
any new MD5 examples for a test suite; no luck, no problem.  Some of the
links did not work for me, but maybe that was in a section to be removed.

For the "typeu" draft I hope that section 1.3 will NOT be removed.  If it
could be a distraction for implementors maybe move this to an appendix,
but please keep it, same idea as for the appendices in RFC 5198.

I'm surprised that TYPE became "less used" by the late 1980s, because all
troubles I ever had with FTP were caused by a missing "binary" or similar
command, when the default TYPE A turned out to be unsuited for binaries,
and from my POV unnecessary for text files -- my favourite text editor is
an XEDIT-clone and can handle any input line end or tab style.  Of course
I recall only miserable "missing TYPE I" failures, and not any cases were
it worked automatically (as mentioned in section 1.3).

In section 2.1 TYPE L was news for me:  So the "typecode" in FTP URIs
does not only add a somewhat obscure D, it also removes an obscure L.
RFC 959 says it stands for "LOCAL TYPE", and the draft says "logical",
is that as it should be?

The next surprise was that my recipe "always use binary" could fail for
servers, which MAY reject any TYPE excluding A.  Checking RFC 959 that's
the case, but RFC 959 also "recommends" (lower case in old RFC) to offer
TYPE I in 3.1.1.3.  It would be clearer if the draft translates this to
the current style of "mustard" (SHOULD or RECOMMENDED).

There is no logical difference between "MAY reject" and "SHOULD support,
and MAY reject", but for readers the latter is hopefully clearer -- and
I think the "recommended" in RFC 959 would back it.

The next interesting point for me was the RFC 5198 profile in section 3,
I didn't know (back when RFC 5198 was a draft) that there would be any
"profiles", I considered it as the final word of the IETF wrt UTF-8 in
Internet protocols.  Now it turns out to be not as simple as I thought.

And I'm not sure that I understand it correctly:  Some characters are
discouraged in RFC 5198, but now permitted for FTP in the draft.  That
(mostly) affects most control codes in RFC 5198 section 2 clause 3, and
"SHOULD be avoided" matches "discouraged".  The exception for SPace was
fixed in an erratum, leaving CR or LF or FF as exceptions in RFC 5198.

Appendix B explains the discouraged BEL, BS, HT, VT, and FF (again).
The "bare LF" barely escapes the "SHOULD be avoided" in RFC 5198, and
I guess that 0x00..0x0C + 0x0E..0x1F + 0x7F are now on the "permitted"
side wrt the "typeu" draft.  If I got this wrong it might be only me,
or an issue in section 3 of the draft.

Apparently 0x0D (CR) is still only permitted in CRLF and still MUST NOT
occur outside of CRLF or CR+NUL, because the draft does not say that it
overrules a "MUST NOT" in RFC 5198.

That leaves 0x80..0x9F, first listed as "SHOULD be avoided" like other
control codes in RFC 5198.  Two statements later and still in section 2
clause 3 0x80..0x9F are caught by a "MUST NOT appear".  That's not only
discouraged, that's verboten:  Does the "typeu" draft stick to RFC 5198
wrt C1 controls, or are they now permitted?

I'm not sure if it helps, but IIRC C1 conrols have 7bit representations
ESC+d2c(c2d(x)-128+64), e.g., CSI (0x9B) can be given as ESC+'[' (0x5B)
in some 7bit encodings -- but that's of course ancient ISO 2022 history
and not the topic of "typeu".  Maybe permit C1 controls explicitly in
the draft, if there is no good reason to treat NEL and CSI completely
different from BEL and ESC.

RFC 5198 discusses the telnet IAC character.  The only case where I met
this beast is in FTP, getting rid of an (erroneous) file or directory
with 0xFF in its name required to send 0xFF twice.  I had to hardcode
this oddity in <http://purl.net/xyzzy/src/ftpsynch.rex> (and the very
similar classic REXX ftpsynch.cmd), but can't tell when I last needed
this -- years ago, both REXX FTP scripts would never create such names.

If that is as it should be (= not only bad luck with an odd FTP server)
please mention it somewhere in the draft.  RFC 1123 lists it in section
3.2.6 (with a reference to RFC 854 page 13), and maybe RFC 1123 should
belong to the normative references in the draft.

-Frank

From evnikita2@gmail.com  Thu Aug 11 20:35:21 2011
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Date: Fri, 12 Aug 2011 06:36:31 +0300
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Subject: Re: [ftpext] [Uri-review] [apps-discuss] FWD: I-D Action: draft-yevstifeyev-ftp-uri-scheme-05.txt
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09.08.2011 21:52, Barry Leiba wrote:
> It's been a week and a half since the original message was posted, but
> I had to discuss this with the other appsawg chairs, the ftpext2
> chairs, and the Applications ADs.
>
> On Sun, Jul 31, 2011 at 12:39 AM, Mykyta Yevstifeyev
> <evnikita2@gmail.com>  wrote:
>> Sorry for cross-posting to 6 addresses :-); please send all your comments to
>> apps-discuss@ietf.org.
> No, please do not.  This document is NOT to be discussed on apps-discuss.
> 1. It will not be processed in the appsawg.
> 2. The ftpext2 chairs have told me that it will not be processed in
> ftpext2.  It is not in their charter, and the WG is not interested in
> rechartering to add it.
> 3. The Apps ADs have told me that they will not sponsor it as an
> individual submission.
>
> In other words, as an IETF document, this is dead.  There is
> insufficient energy and interest in the IETF to hash this document
> out.  Please do not continue work on this document.  In any case,
> please do not discuss it on the apps-discuss mailing list.

Barry,

I'm very unlikely to stop working on the document.  Anyway, nothing in 
your message disallows me to wait for better times, when the situation 
changes.

Mykyta

>
> Barry Leiba, appsawg chair
>
>>> A New Internet-Draft is available from the on-line Internet-Drafts
>>> directories.
>>>
>>>         Title           : The&#39;ftp&#39; URI Scheme
>>>         Author(s)       : Mykyta Yevstifeyev
>>>         Filename        : draft-yevstifeyev-ftp-uri-scheme-05.txt
>>>         Pages           : 29
>>>         Date            : 2011-07-24
>>>
>>>     This document specifies the&#39;ftp&#39; Uniform Resource Identifier
>>> (URI)
>>>     scheme, which is used to refer to resources accessible via File
>>>     Transfer Protocol (FTP).  It updates RFC 959 and RFC 1738.
>>>
>>> A URL for this Internet-Draft is:
>>> http://www.ietf.org/internet-drafts/draft-yevstifeyev-ftp-uri-scheme-05.txt
> _______________________________________________
> Uri-review mailing list
> Uri-review@ietf.org
> https://www.ietf.org/mailman/listinfo/uri-review
>

