Cyrus IMAP 2.1.12 and LSUB command

[Bernd Nies]

Hi,

We're using Cyrus IMAP 2.1.12 together with SquirrelMail 1.4.0 and other 
IMAP clients (Mozilla/Netscape). It seems that there is a little bug 
with listing the subscribed folders using LSUB and various mailbox 
wildcard patterns combined with the way I configured the IMAP server 
(altnamespace and unixhierarchysep).

The "%" matches all mailboxes without hierarchy delimiter. The output 
below is correct.

. LSUB "" %
* LSUB (\Noinferiors) "/" "INBOX"
* LSUB () "/" "Drafts"
* LSUB () "/" "Junk"
* LSUB () "/" "Sent"
* LSUB () "/" "Trash"
* LSUB () "/" "sysadm"
* LSUB (\Noselect \HasChildren) "/" "Other Users"
* LSUB (\Noselect \HasChildren) "/" "Shared Folders"
. OK Completed (0.000 secs 9 calls)

The "*" matches all mailboxes including hierarchy delimiter. The output 
below is also correct.

. LSUB "" *
* LSUB (\Noinferiors) "/" "INBOX"
* LSUB () "/" "Drafts"
* LSUB () "/" "Junk"
* LSUB () "/" "Sent"
* LSUB () "/" "Trash"
* LSUB () "/" "sysadm"
* LSUB () "/" "Other Users/kauf/Trash"
* LSUB () "/" "Shared Folders/jokes"
* LSUB () "/" "Shared Folders/mailinglists/cert-advisory at cert.org"
* LSUB () "/" "Shared Folders/mailinglists/ietf-mta-filters at imc.org"
* LSUB () "/" "Shared Folders/mailinglists/info-cyrus at andrew.cmu.edu"
* LSUB () "/" "Shared Folders/mailinglists/postfix-users at postfix.org"
* LSUB () "/" "Shared 
Folders/mailinglists/squirrelmail-users at lists.sourceforge.net"
* LSUB () "/" "Shared Folders/tasteless"
. OK Completed (0.010 secs 15 calls)

But SquirrelMail 1.4.0 uses the pattern "*%" which should match both. 
But the toplevel "Shared Folders" is missing.

. LSUB "" *%
* LSUB (\Noinferiors) "/" "INBOX"
* LSUB () "/" "Drafts"
* LSUB () "/" "Junk"
* LSUB () "/" "Sent"
* LSUB () "/" "Trash"
* LSUB () "/" "sysadm"
* LSUB (\Noselect \HasChildren) "/" "Other Users"
* LSUB (\Noselect \HasChildren) "/" "Other Users/kauf"
* LSUB () "/" "Other Users/kauf/Trash"
 >>> * LSUB (\Noselect \HasChildren) "/" "Shared Folders" <<< Missing!
* LSUB () "/" "Shared Folders/jokes"
* LSUB (\NonExistent \Noselect \HasChildren) "/" "Shared 
Folders/mailinglists"
* LSUB () "/" "Shared Folders/mailinglists/cert-advisory at cert.org"
* LSUB () "/" "Shared Folders/mailinglists/ietf-mta-filters at imc.org"
* LSUB () "/" "Shared Folders/mailinglists/info-cyrus at andrew.cmu.edu"
* LSUB () "/" "Shared Folders/mailinglists/postfix-users at postfix.org"
* LSUB () "/" "Shared 
Folders/mailinglists/squirrelmail-users at lists.sourceforge.net"
* LSUB () "/" "Shared Folders/tasteless"
. OK Completed (0.010 secs 22 calls)


This looks like a Cyrus IMAP bug to me because "Other Users" is listed 
separately but "Shared Folders" not. RFC 3501 says:

       The character "*" is a wildcard, and matches zero or more
       characters at this position.  The character "%" is similar to "*",
       but it does not match a hierarchy delimiter.  If the "%" wildcard
       is the last character of a mailbox name argument, matching levels
       of hierarchy are also returned.  If these levels of hierarchy are
       not also selectable mailboxes, they are returned with the
       \Noselect mailbox name attribute (see the description of the LIST

So this pattern should be correct.

My Cyrus imapd.conf is:

	configdirectory: /var/cyrus
	sievedir: /opt/sieve
	lmtpsocket: /var/cyrus/socket/lmtp

	defaultpartition: default
	partition-default: /data/mail1
	partition-share: /data/mail2

	servername: imap.domain.tld
	admins: cyrus root
	unixhierarchysep: yes
	altnamespace: yes
	sendmail: /opt/postfix/bin/sendmail
	logtimestamps: yes
	defaultacl: anyone lrsp

	allowplaintext: yes
	sasl_pwcheck_method: saslauthd
	sasl_mech_list: PLAIN

The other IMAP clients display the folders correctly but they use 
another method of getting the list of subscribed mailboxes.

Thanks in advance for help and fixing bugs.

Regards,
Bernd Nies