ezmlm-web-modules/crypto-ezmlm/trunk/python/lispet/interfaces/ezmlm.py

162 lines
5.1 KiB
Python
Executable file

#!/usr/bin/env python2.4
#
# This file is part of lispet - an encryption filter for different
# mailing list manager.
#
# Copyright 02007-02008 Sense.Lab e.V. <info@senselab.org>
#
#
# lispet 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 2 of the License, or
# (at your option) any later version.
#
# lispet 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 the CryptoBox; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import sys
import os
import re
# the following modules are imported later
#import subprocess
# check if the subprocess module is available (python >= 2.4)
try:
import subprocess
except ImportError:
sys.stderr.write("Failed to import the python module 'subprocess'! "
. "It requires python2.4 or higher.\n")
sys.exit(1)
############### some default settings ##################
## we will finally deliver via the original qmail-queue
if os.environ.has_key("QMAILQUEUE"):
QMAILQUEUE_BIN = os.environ["QMAILQUEUE"]
else:
QMAILQUEUE_BIN = '/var/qmail/bin/qmail-queue'
def write_to_qmailqueue:
## use tmpfile as input for qmail-queue
## we have to complicate things a little bit, as qmail-queue expects input
## at file handle 1 - this is usually stdout
# TODO: use something like StringIO instead
tmpfile = os.tmpfile()
tmpfile.write('F%s\0T%s\0\0' % (sender, recipient))
tmpfile.seek(0)
## execute the original qmail-queue
proc = subprocess.Popen(
shell = False,
stdin = subprocess.PIPE,
stdout = tmpfile.fileno(),
env = os.environ,
args = [ QMAILQUEUE_BIN ] )
proc.stdin.write(mail.as_string())
## tmpfile is deleted automatically after closing
tmpfile.close()
proc.stdin.close()
proc.wait()
## exit immediately, if qmail-queue failed once
if proc.returncode != 0:
sys.exit(proc.returncode)
#################### input/output stuff ###################
def internal_error(message=None, exitcode=81):
if message:
sys.stderr.write(message + "\n")
sys.exit(exitcode)
def process_input_and_output(handler):
"""Read mail content and the envelopement information from fd1 and fd2
see 'main qmail-queue' for details
"""
in_mail = os.fdopen(0, "r")
in_envelope = os.fdopen(1, "rb")
## try to read mail and
try:
mail_text = in_mail.read()
envelope = in_envelope.read()
except IOError:
## report "Unable to read the message or envelope." (see 'man qmail-queue')
sys.exit(54)
## see 'man qmail-queue' for details of the envelope format
envelope_addresses = re.match(u'F(.+?)\0((?:T[^\0]+?\0)+)\0$', envelope)
if not envelope_addresses or (len(envelope_addresses.groups()) != 2):
## report "Envelope format error." (see 'man qmail-queue')
sys.exit(91)
## the first match is the sender address
envelope_sender = envelope_addresses.groups()[0]
## the second match is the list of all recipients
## each preceded by "T" and followed by "\0"
envelope_recipients = envelope_addresses.groups()[1].split("\0")
## remove leading "T" and skip empty values
envelope_recipients = [ e[1:] for e in envelope_recipients if e ]
for recipient in envelope_recipients:
handler.process_mail(envelope_sender, recipient, mail_text)
def check_for_errors():
errors = False
## check the original qmail-queue binary
if not os.access(QMAILQUEUE_BIN, os.X_OK):
sys.stderr.write("Could not find executable qmail-queue: %s\n" % QMAILQUEUE_BIN)
errors = True
## check the existence of the pyme module
try:
import pyme
except ImportError:
sys.stderr.write("Failed to import python-pyme!\n")
errors = True
## check if the subprocess module is available (python >= 2.4)
try:
import subprocess
except ImportError:
sys.stderr.write("Failed to import the python module 'subprocess'! It requires python2.4.\n")
errors = True
return errors == False
if __name__ == '__main__':
# reduce priority
os.nice(5)
if not check_for_errors():
internal_error()
if len(sys.argv) == 1:
## we were only supposed to run the self-tests - exiting successfully
sys.exit(0)
## we expect exactly one parameter - the mailinglist directory
if len(sys.argv) != 2:
internal_error("More than one parameter (the mailinglist directory) given!")
## print some help if it was requested
if sys.argv[0] == '--help':
sys.stderr.write("Syntax: %s [MAILINGLIST_DIRECTORY]\n\n" % \
os.path.basename(sys.argv[0]))
sys.stderr.write("If you omit the MAILINGLIST_DIRECTORY, " \
+ "then only some self-tests are done.\n\n")
sys.exit(0)
## retrieve the mailing list directory by reading the dotqmail file
list_dir = sys.argv[1]
## does the mailinglist directory exist?
if not os.access(list_dir, os.X_OK):
internal_error("Could not access the mailinglist directory: %s" % list_dir)
## reencrypt the mail for each recipient
mail_handler = MailEncryption(list_dir)
process_input_and_output(mail_handler)