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# Copyright (C) 2001-2015 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman 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.
#
# GNU Mailman 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
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Creation/deletion hooks for the Postfix MTA."""
__all__ = [
'LMTP',
]
import os
import logging
from flufl.lock import Lock
from mailman.config import config
from mailman.config.config import external_configuration
from mailman.interfaces.listmanager import IListManager
from mailman.interfaces.mta import (
IMailTransportAgentAliases, IMailTransportAgentLifecycle)
from mailman.utilities.datetime import now
from operator import attrgetter
from zope.component import getUtility
from zope.interface import implementer
log = logging.getLogger('mailman.error')
ALIASTMPL = '{0:{2}}lmtp:[{1.mta.lmtp_host}]:{1.mta.lmtp_port}'
NL = '\n'
class _FakeList:
"""Duck-typed list for the `IMailTransportAgentAliases` interface."""
def __init__(self, list_name, mail_host):
self.list_name = list_name
self.mail_host = mail_host
self.posting_address = '{0}@{1}'.format(list_name, mail_host)
@implementer(IMailTransportAgentLifecycle)
class LMTP:
"""Connect Mailman to Postfix via LMTP."""
def __init__(self):
# Locate and read the Postfix specific configuration file.
mta_config = external_configuration(config.mta.configuration)
self.postmap_command = mta_config.get('postfix', 'postmap_command')
def create(self, mlist):
"""See `IMailTransportAgentLifecycle`."""
# We can ignore the mlist argument because for LMTP delivery, we just
# generate the entire file every time.
self.regenerate()
delete = create
def regenerate(self, directory=None):
"""See `IMailTransportAgentLifecycle`."""
# Acquire a lock file to prevent other processes from racing us here.
if directory is None:
directory = config.DATA_DIR
lock_file = os.path.join(config.LOCK_DIR, 'mta')
with Lock(lock_file):
lmtp_path = os.path.join(directory, 'postfix_lmtp')
lmtp_path_new = lmtp_path + '.new'
with open(lmtp_path_new, 'w') as fp:
self._generate_lmtp_file(fp)
# Atomically rename to the intended path.
os.rename(lmtp_path_new, lmtp_path)
domains_path = os.path.join(directory, 'postfix_domains')
domains_path_new = domains_path + '.new'
with open(domains_path_new, 'w') as fp:
self._generate_domains_file(fp)
# Atomically rename to the intended path.
os.rename(domains_path_new, domains_path)
# Now, run the postmap command on both newly generated files. If
# one files, still try the other one.
errors = []
for path in (lmtp_path, domains_path):
command = self.postmap_command + ' ' + path
status = (os.system(command) >> 8) & 0xff
if status:
msg = 'command failure: %s, %s, %s'
errstr = os.strerror(status)
log.error(msg, command, status, errstr)
errors.append(msg % (command, status, errstr))
if errors:
raise RuntimeError(NL.join(errors))
def _generate_lmtp_file(self, fp):
# The format for Postfix's LMTP transport map is defined here:
# http://www.postfix.org/transport.5.html
#
# Sort all existing mailing list names first by domain, then by
# local part. For Postfix we need a dummy entry for the domain.
list_manager = getUtility(IListManager)
utility = getUtility(IMailTransportAgentAliases)
by_domain = {}
sort_key = attrgetter('list_name')
for list_name, mail_host in list_manager.name_components:
mlist = _FakeList(list_name, mail_host)
by_domain.setdefault(mlist.mail_host, []).append(mlist)
print("""\
# AUTOMATICALLY GENERATED BY MAILMAN ON {0}
#
# This file is generated by Mailman, and is kept in sync with the binary hash
# file. YOU SHOULD NOT MANUALLY EDIT THIS FILE unless you know what you're
# doing, and can keep the two files properly in sync. If you screw it up,
# you're on your own.
""".format(now().replace(microsecond=0)), file=fp)
for domain in sorted(by_domain):
print("""\
# Aliases which are visible only in the @{0} domain.""".format(domain),
file=fp)
for mlist in sorted(by_domain[domain], key=sort_key):
aliases = list(utility.aliases(mlist))
width = max(len(alias) for alias in aliases) + 3
print(ALIASTMPL.format(aliases.pop(0), config, width), file=fp)
for alias in aliases:
print(ALIASTMPL.format(alias, config, width), file=fp)
print(file=fp)
def _generate_domains_file(self, fp):
# Uniquify the domains, then sort them alphabetically.
domains = set()
for list_name, mail_host in getUtility(IListManager).name_components:
domains.add(mail_host)
print("""\
# AUTOMATICALLY GENERATED BY MAILMAN ON {0}
#
# This file is generated by Mailman, and is kept in sync with the binary hash
# file. YOU SHOULD NOT MANUALLY EDIT THIS FILE unless you know what you're
# doing, and can keep the two files properly in sync. If you screw it up,
# you're on your own.
""".format(now().replace(microsecond=0)), file=fp)
for domain in sorted(domains):
print('{0} {0}'.format(domain), file=fp)
print(file=fp)
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