# Copyright (C) 2000-2018 by the Free Software Foundation, Inc.
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""Yale's mail server is pretty dumb.
Its reports include the end user's name, but not the full domain. I think we
can usually guess it right anyway. This is completely based on examination of
the corpse, and is subject to failure whenever Yale even slightly changes
their MTA. :(
"""
import re
from cStringIO import StringIO
from email.Utils import getaddresses
scre = re.compile(r'Message not delivered to the following', re.IGNORECASE)
ecre = re.compile(r'Error Detail', re.IGNORECASE)
acre = re.compile(r'\s+(?P<addr>\S+)\s+')
def process(msg):
if msg.is_multipart():
return None
try:
whofrom = getaddresses([msg.get('from', '')])[0][1]
if not whofrom:
return None
username, domain = whofrom.split('@', 1)
except (IndexError, ValueError):
return None
if username.lower() <> 'mailer-daemon':
return None
parts = domain.split('.')
parts.reverse()
for part1, part2 in zip(parts, ('edu', 'yale')):
if part1 <> part2:
return None
# Okay, we've established that the bounce came from the mailer-daemon at
# yale.edu. Let's look for a name, and then guess the relevant domains.
names = {}
body = StringIO(msg.get_payload())
state = 0
# simple state machine
# 0 == init
# 1 == intro found
while 1:
line = body.readline()
if not line:
break
if state == 0 and scre.search(line):
state = 1
elif state == 1 and ecre.search(line):
break
elif state == 1:
mo = acre.search(line)
if mo:
names[mo.group('addr')] = 1
# Now we have a bunch of names, these are either @yale.edu or
# @cs.yale.edu. Add them both.
addrs = []
for name in names.keys():
addrs.append(name + '@yale.edu')
addrs.append(name + '@cs.yale.edu')
return addrs
