[Dovecot] bug with rsh/ssh connections

5 Oct 2006

      (Using rc7 code)
There seems to be a bug in rsh/ssh-style connections.
For reference, on a normal imap connection (port 143, 993, etc.) things
are OK. The imap session ends (from a client-end command "a logout") thus:
a logout

BYE Logging out
a OK Logout completed.
Connection closed by foreign host.
unix-prompt%

But when the connection had been established using rsh or ssh to the
servers's "/etc/rimapd" which contains:
exec /usr/dovecot/sbin/dovecot --exec-mail imap
the session ends thus:
a logout

BYE Logging out
a OK Logout completed.
imap(<username>): Info: Disconnected: Logged out
unix-prompt%

Note that additional, protocol-breaking, "imap(...): Info ..." line.
This seems to be coming from "imap/cmd-logout.c" calling:
client_disconnect(client, "Logged out");
which in turn ("imap/client.c") does:
i_info("Disconnected: %s", reason);
On the imap connection, this "i_info(...)" output goes (correctly) to
syslog, but on the rsh/ssh connection this output seems to go to something
like stdout.
This strongly suggests a bug: an inconsistency between the two connection
types, possibly regarding the way that stdout, stderr, syslog etc. are
initialised, assigned, adjusted, etc.
--
:  David Lee                                I.T. Service          :
:  Senior Systems Programmer                Computer Centre       :
:                                           Durham University     :
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:                                           Durham DH1 3LE        :
:  Phone: +44 191 334 2752                  U.K.                  :

[Dovecot] bug with rsh/ssh connections

David Lee

For reference, on a normal imap connection (port 143, 993, etc.) things are OK. The imap session ends (from a client-end command "a logout") thus:

But when the connection had been established using rsh or ssh to the servers's "/etc/rimapd" which contains: exec /usr/dovecot/sbin/dovecot --exec-mail imap the session ends thus: