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- Newsgroups: comp.protocols.tcp-ip
- Path: sparky!uunet!noc.near.net!vaxeline.ftp.com!cream.ftp.com!jbvb
- From: jbvb@vax.ftp.com (James B. VanBokkelen)
- Subject: Re: FTP: RFC interpretation
- Message-ID: <920831124429@cream.ftp.com>
- Nntp-Software: PC/TCP NNTP
- Keywords: Host Requirements FTP RFC-959
- Lines: 31
- Sender: root@vaxeline.ftp.com (vaxeline.ftp.com root account)
- Nntp-Posting-Host: whipped-cream.ftp.com
- Reply-To: jbvb@ftp.com
- Organization: FTP Software, Inc., Wakefield, MA
- References: <1992Aug20.030954.4831@cssc-woll.tansu.com.au>
- Date: Mon, 31 Aug 1992 12:44:29
-
- In article <1992Aug20.030954.4831@cssc-woll.tansu.com.au> brian@cssc-woll.tansu.com.au (byrnes brian) writes:
-
- Section 5.4 of the RFC has "each command listed with its possible
- replies". As I read it, this section would immediately brand
- responses 1 and 2 as protocol violations, because the server's
- replies are not on the list of "possible replies".
-
- IBM's representative defended the server's actions in the following
- words:
- "I'm not sure that the intent of section 5.4 is to list each and every
- possible reply code from the server. However, section 4.2 and 4.2.1
- further define the reply codes and how they can be used to determine
- the state of the machine. Please have the customer read those sections."
-
- In RFC 1123 (Host Requirements Upper Layers), the subject is discussed
- in section 4.1.2.11. "A Server-FTP SHOULD use the reply-codes defined
- in RFC-959 whever they apply. However, a server-FTP MAY use a
- different reply code when needed, as long as the general rules of
- section 4.2 are followed." "A user-FTP SHOULD gnerally use only the
- highest-order digit of a 3-digit reply code for making a procedural
- decision...".
-
- As I recall the discussion, the issue arose when an HR WG member proposed
- that we require a fixed list of reply codes. However, with further
- discussion we decided that the list in RFC 959 wasn't good enough for
- all the situations we could imagine, and we had to open the list.
- Nevertheless, an implementor should have good reasons (which I'd hope
- they could explain to you) for any divergence from RFC 959.
-
- James B. VanBokkelen 26 Princess St., Wakefield, MA 01880
- FTP Software Inc. voice: (617) 246-0900 fax: (617) 246-0901
-
-