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Throw errors on connection refused and on non-standard SSL ports 

We were "crashing" with tracebacks when we could not connect to a host,
(e.g. because no service was on the port) and we were getting mysterious
SSL tracebacks when someone tried to connect via SSL to a non-ssl port.

In these cases, we will now throw an nice error message. On python<2.6
where no ssl module exists, we simply won't throw those errors.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
This commit is contained in:
Sebastian Spaeth 2011-06-06 11:04:55 +02:00 committed by Nicolas Sebrecht
parent a5a4cb214b
commit 3dc9fc519a
1 changed files with 33 additions and 5 deletions
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38
offlineimap/imapserver.py
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@ -24,9 +24,14 @@ import offlineimap.accounts
import hmac
import socket
import base64
import errno
from socket import gaierror
try:
from ssl import SSLError
except ImportError:
# Protect against python<2.6, use dummy and won't get SSL errors.
SSLError = None
try:
# do we have a recent pykerberos?
have_gss = False
@ -280,14 +285,37 @@ class IMAPServer:
if(self.connectionlock.locked()):
self.connectionlock.release()
if type(e) == gaierror:
# now, check for known errors and throw OfflineImapErrors
severity = OfflineImapError.ERROR.REPO
if isinstance(e, gaierror):
#DNS related errors. Abort Repo sync
severity = OfflineImapError.ERROR.REPO
#TODO: special error msg for e.errno == 2 "Name or service not known"?
reason = "Could not resolve name '%s' for repository "\
"'%s'. Make sure you have configured the ser"\
"ver name correctly and that you are online."\
% (self.hostname, self.reposname)
"ver name correctly and that you are online."%\
(self.hostname, self.reposname)
raise OfflineImapError(reason, severity)
elif isinstance(e, SSLError) and e.errno == 1:
# SSL unknown protocol error
# happens e.g. when connecting via SSL to a non-SSL service
if self.port != 443:
reason = "Could not connect via SSL to host '%s' and non-s"\
"tandard ssl port %d configured. Make sure you connect"\
" to the correct port." % (self.hostname, self.port)
else:
reason = "Unknown SSL protocol connecting to host '%s' for"\
"repository '%s'. OpenSSL responded:\n%s"\
% (self.hostname, self.reposname, e)
raise OfflineImapError(reason, severity)
elif isinstance(e, socket.error) and e.args[0] == errno.ECONNREFUSED:
# "Connection refused", can be a non-existing port, or an unauthorized
# webproxy (open WLAN?)
reason = "Connection to host '%s:%d' for repository '%s' was "\
"refused. Make sure you have the right host and port "\
"configured and that you are actually able to access the "\
"network." % (self.hostname, self.port, self.reposname)
raise OfflineImapError(reason, severity)
# Could not acquire connection to the remote;
# socket.error(last_error) raised