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3 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Problem with fetc...| From | Sent On | Attachments |
|---|---|---|
| xiuleifeidohk08 xiuleifeidohk08 | Jul 17, 2001 12:52 am | |
| Daniel Biddle | Jul 17, 2001 3:22 am | |
| Sam Varshavchik | Jul 17, 2001 4:49 am |
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| Subject: | Re: [courier-users] Problem with fetch command | Actions... |
|---|---|---|
| From: | Daniel Biddle (del...@osian.net) | |
| Date: | Jul 17, 2001 3:22:40 am | |
| List: | net.sourceforge.lists.courier-users | |
On Tue, Jul 17, 2001 at 03:52:29PM +0800, xiuleifeidohk08 xiuleifeidohk08 wrote:
We're using Easy Mail object 5.0 to parse mail from Courier IMAP. There is problem with subject with double quot(") in it e.g Subject:The "hill" is very steep. What happen is that the object crash when doing a "fetch envelope" to get the subject.
The object *crashes*? If so, there's something wrong with it: it shouldn't crash no matter what input it's given.
However, the object works fine with other IMAP servers. So I believe the problem lies with the way Courier IMAP handle the double quote(") symbol in its fetch envelope implementation.
This is the result of "fetch envelope" using Courier IMAP:
* 4 FETCH (ENVELOPE ("Tue, 17 Jul 2001 14:49:17 +0800" "The \"hill\" is very steep" (("postm" NIL "postm" "2bit.com")) (("postm" NIL "postm" "2bit.com")) (("postm" NIL "postm" "2bit.com")) (("yw...@2bit.com" NIL "yws" "2bit.com")) NIL NIL NIL "<5.0.2.1.0.20010717144733.01b0c990@167.216.239.108>"))
This is the result of "fetch envelope" using the IMAP that has no problem.
* 139 FETCH (ENVELOPE ("Tue, 17 Jul 2001 14:49:39 +0800" {24}The "hill" is very steep (("shm" NIL "yws" "2bit.com")) (("shm" NIL "yws" "2bit.com")) (("shm" NIL "yws" "2bit.com")) (("yws" NIL "yws" "maxis.net.my")) NIL NIL NIL "<5.0.2.1.0.20010717144919.01b0f8c0@167.216.239.108>"))
I presume there was a CRLF after } in the result you actually got, since it's required by the protocol.
See the difference? Courier IMAP escape the " symbol with a \ while other IMAP use a byte count {24} at the front..so there's no problem with " being in the subject.
See <http://www.isi.edu/in-notes/rfc2060.txt>, in particular these productions:
# env_subject ::= nstring # # nstring ::= string / nil # # string ::= quoted / literal # # quoted ::= <"> *QUOTED_CHAR <"> # # QUOTED_CHAR ::= <any TEXT_CHAR except quoted_specials> / # "\" quoted_specials # # quoted_specials ::= <"> / "\" # # literal ::= "{" number "}" CRLF *CHAR8 # ;; Number represents the number of CHAR8 octets
Note that it allows any string to be either quoted or literal (length prefixed). An ENVELOPE subject is such a string:
response > response_data > message_data > msg_att > envelope envelope > env_subject > nstring > string string > quoted > QUOTED_CHAR > quoted_specials string > literal
This seems like a flaw in Courier-IMAP.
It's not - Courier-IMAP is working perfectly reasonably, and within the letter of the specification. If the EasyMail IMAP4 Object assumes that env_subject is always a literal, it has the flaw, not Courier-IMAP.
Any idea how do I solve this and will this problem be rectified?
Ask Quiksoft if this has been fixed yet (I couldn't find a change log on the Web site). You may have to upgrade to version 6.
-- Daniel Biddle <del...@osian.net>