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# -*- coding: utf-8 -*-
# __init__.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
SMTP relay helper function.
"""
import logging
from twisted.internet import reactor
from twisted.internet.error import CannotListenError
logger = logging.getLogger(__name__)
from leap.common.events import proto, signal
from leap.mail.smtp.smtprelay import SMTPFactory
def setup_smtp_relay(port, keymanager, smtp_host, smtp_port,
smtp_cert, smtp_key, encrypted_only):
"""
Setup SMTP relay to run with Twisted.
This function sets up the SMTP relay configuration and the Twisted
reactor.
:param port: The port in which to run the server.
:type port: int
:param keymanager: A Key Manager from where to get recipients' public
keys.
:type keymanager: leap.common.keymanager.KeyManager
:param smtp_host: The hostname of the remote SMTP server.
:type smtp_host: str
:param smtp_port: The port of the remote SMTP server.
:type smtp_port: int
:param smtp_cert: The client certificate for authentication.
:type smtp_cert: str
:param smtp_key: The client key for authentication.
:type smtp_key: str
:param encrypted_only: Whether the SMTP relay should send unencrypted mail
or not.
:type encrypted_only: bool
:returns: tuple of SMTPFactory, twisted.internet.tcp.Port
"""
# The configuration for the SMTP relay is a dict with the following
# format:
#
# {
# 'host': '<host>',
# 'port': <int>,
# 'cert': '<cert path>',
# 'key': '<key path>',
# 'encrypted_only': <True/False>
# }
config = {
'host': smtp_host,
'port': smtp_port,
'cert': smtp_cert,
'key': smtp_key,
'encrypted_only': encrypted_only
}
# configure the use of this service with twistd
factory = SMTPFactory(keymanager, config)
try:
tport = reactor.listenTCP(port, factory,
interface="localhost")
signal(proto.SMTP_SERVICE_STARTED, str(smtp_port))
return factory, tport
except CannotListenError:
logger.error("STMP Service failed to start: "
"cannot listen in port %s" % (
smtp_port,))
signal(proto.SMTP_SERVICE_FAILED_TO_START, str(smtp_port))
except Exception as exc:
logger.error("Unhandled error while launching smtp relay service")
logger.exception(exc)
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