Re: nnimap versus tls

[Gaute B Strokkenes <gs234@cam.ac.uk>]

On 4 jul 2003, kai.grossjohann@gmx.net wrote:
> Gaute B Strokkenes <gs234@cam.ac.uk> writes:
>
>> --8<-- Debugger entered--Lisp error: (error "Selecting deleted
>> buffer") imap-arrival-filter(#<process imap<1>> "* BYE
>> kern.srcf.societies.cam.ac.uk IMAP4rev1 server terminating
>> connection^M\n6 OK LOGOUT completed^M\n*** Received corrupted
>> data(-9) - server has terminated the connection abnormally\n")
>> delete-process(#<process imap<2>>)
>
> It seems that Gnus isn't expecting the server to close the
> connection, err, unexpectedly.
>
> Or am I misinterpreting this?

I wouldn't know.

This is a cut-and-past of the relevant portions of *imap-log*.  I
haven't changed anything, other than to replace my password with
something else.

Connecting to '131.111.179.82:993'...
Resolving 'imap.srcf.ucam.org'...
- Certificate type: X.509
 - Certificate info:
 # Certificate is valid since: Wed Aug 14 14:17:00 BST 2002
 # Certificate expires: Thu Aug 14 14:17:00 BST 2003
 # Certificate fingerprint: 0e 51 8a 6b c3 e0 c3 bf d1 54 1e 1b af ab ac cf 
 # Certificate serial number: 00 
 # Certificate version: #3
 # Certificate public key algorithm: RSA
 #   Modulus: 1024 bits
 # CN=imap.srcf.ucam.org,E=sysadmins@srcf.ucam.org,OU=Student-Run Computing Facility,O=University of Cambridge,L=Cambridge,ST=Cambridgeshire,C=UK
 # Certificate Issuer's info:
 # CN=imap.srcf.ucam.org,E=sysadmins@srcf.ucam.org,OU=Student-Run Computing Facility,O=University of Cambridge,L=Cambridge,ST=Cambridgeshire,C=UK

- Peer's certificate is NOT trusted
- Version: TLS 1.0
- Key Exchange: RSA
- Cipher: ARCFOUR 128
- MAC: SHA
- Compression: NULL
- Handshake was completed

- Simple Client Mode:

* OK [CAPABILITY IMAP4REV1 X-NETSCAPE LOGIN-REFERRALS STARTTLS AUTH=LOGIN] localhost IMAP4rev1 2001.315 at Sat, 5 Jul 2003 09:22:10 +0100 (BST)
1 CAPABILITY
* CAPABILITY IMAP4REV1 X-NETSCAPE NAMESPACE MAILBOX-REFERRALS SCAN SORT THREAD=REFERENCES THREAD=ORDEREDSUBJECT MULTIAPPEND LOGIN-REFERRALS STARTTLS AUTH=LOGIN
1 OK CAPABILITY completed
2 LOGIN "gs234" "I'm not telling you..."
2 OK [CAPABILITY IMAP4REV1 X-NETSCAPE NAMESPACE MAILBOX-REFERRALS SCAN SORT THREAD=REFERENCES THREAD=ORDEREDSUBJECT MULTIAPPEND] User gs234 authenticated
3 SELECT "INBOX"
* 3 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1056494962] UID validity status
* OK [UIDNEXT 43763] Predicted next UID
* FLAGS (\Answered \Flagged \Deleted \Draft \Seen)
* OK [PERMANENTFLAGS (\* \Answered \Flagged \Deleted \Draft \Seen)] Permanent flags
3 OK [READ-WRITE] SELECT completed
4 UID SEARCH UNSEEN UNDELETED
* SEARCH
4 OK UID SEARCH completed
5 CLOSE
5 OK CLOSE completed
6 LOGOUT

And this is what I get by setting debug-on-error to t:

Debugger entered--Lisp error: (error "Selecting deleted buffer")
  imap-arrival-filter(#<process imap<1>> "* BYE kern.srcf.societies.cam.ac.uk IMAP4rev1 server terminating connection\r\n6 OK LOGOUT completed\r\n*** Received corrupted data(-9) - server has terminated the connection abnormally\n")

By comparision, this is what I get in *imap-log* on one of those
occasions when the error does not occur:

[snip]
5 OK UID FETCH completed
6 UID STORE 43765 +FLAGS (\Deleted)
* 4 FETCH (FLAGS (\Recent \Deleted) UID 43765)
6 OK UID STORE completed
7 CLOSE
7 OK CLOSE completed
8 LOGOUT
* BYE kern.srcf.societies.cam.ac.uk IMAP4rev1 server terminating connection
8 OK LOGOUT completed
*** Received corrupted data(-9) - server has terminated the connection abnormally

Note the similarities here.  It seems that the "*** Received corrupted
data"... etc. is just gnutls complaining about the other end hanging
up--but that is what it is supposed to do, given that we've gone
through the normal IMAP logout sequence.

So, the problem is that imap-arrival-filter and "Selecting deleted
buffer", whatever that means.  I do not at all know how this stuff
works, but I see that imap-arrival-filter does a 

  (with-current-buffer (process-buffer proc)
    ...

So it seems that the process buffer dies unexpectedly.  But my elisp
skills are insufficiently 1337 to handle this.

-- 
Big Gaute                               http://www.srcf.ucam.org/~gs234/
I want EARS!  I want two ROUND BLACK EARS to make me feel warm 'n secure!!