1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
# Copyright (C) 1998-2016 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/>.
import os
import sys
import time
import socket
import logging
import nntplib
import optparse
import email.Errors
from email.Parser import Parser
from flufl.lock import Lock, TimeOutError
from lazr.config import as_host_port
from mailman import MailList
from mailman import Message
from mailman import loginit
from mailman.configuration import config
from mailman.core.i18n import _
from mailman.core.switchboard import Switchboard
from mailman.version import MAILMAN_VERSION
# Work around known problems with some RedHat cron daemons
import signal
signal.signal(signal.SIGCHLD, signal.SIG_DFL)
NL = '\n'
log = None
class _ContinueLoop(Exception):
pass
def parseargs():
parser = optparse.OptionParser(version=MAILMAN_VERSION,
usage=_("""\
%prog [options]
Poll the NNTP servers for messages to be gatewayed to mailing lists."""))
parser.add_option('-C', '--config',
help=_('Alternative configuration file to use'))
opts, args = parser.parse_args()
if args:
parser.print_help()
print >> sys.stderr, _('Unexpected arguments')
sys.exit(1)
return opts, args, parser
_hostcache = {}
def open_newsgroup(mlist):
# Split host:port if given.
nntp_host, nntp_port = as_host_port(mlist.nntp_host, default_port=119)
# Open up a "mode reader" connection to nntp server. This will be shared
# for all the gated lists having the same nntp_host.
conn = _hostcache.get(mlist.nntp_host)
if conn is None:
try:
conn = nntplib.NNTP(nntp_host, nntp_port,
readermode=True,
user=config.NNTP_USERNAME,
password=config.NNTP_PASSWORD)
except (socket.error, nntplib.NNTPError, IOError) as e:
log.error('error opening connection to nntp_host: %s\n%s',
mlist.nntp_host, e)
raise
_hostcache[mlist.nntp_host] = conn
# Get the GROUP information for the list, but we're only really interested
# in the first article number and the last article number
r, c, f, l, n = conn.group(mlist.linked_newsgroup)
return conn, int(f), int(l)
def clearcache():
for conn in set(_hostcache.values()):
conn.quit()
_hostcache.clear()
# This function requires the list to be locked.
def poll_newsgroup(mlist, conn, first, last, glock):
listname = mlist.internal_name()
# NEWNEWS is not portable and has synchronization issues.
for num in range(first, last):
glock.refresh()
try:
headers = conn.head(repr(num))[3]
found_to = False
beenthere = False
for header in headers:
i = header.find(':')
value = header[:i].lower()
if i > 0 and value == 'to':
found_to = True
# FIXME 2010-02-16 barry use List-Post header.
if value <> 'x-beenthere':
continue
if header[i:] == ': %s' % mlist.posting_address:
beenthere = True
break
if not beenthere:
body = conn.body(repr(num))[3]
# Usenet originated messages will not have a Unix envelope
# (i.e. "From " header). This breaks Pipermail archiving, so
# we will synthesize one. Be sure to use the format searched
# for by mailbox.UnixMailbox._isrealfromline(). BAW: We use
# the -bounces address here in case any downstream clients use
# the envelope sender for bounces; I'm not sure about this,
# but it's the closest to the old semantics.
lines = ['From %s %s' % (mlist.GetBouncesEmail(),
time.ctime(time.time()))]
lines.extend(headers)
lines.append('')
lines.extend(body)
lines.append('')
p = Parser(Message.Message)
try:
msg = p.parsestr(NL.join(lines))
except email.Errors.MessageError as e:
log.error('email package exception for %s:%d\n%s',
mlist.linked_newsgroup, num, e)
raise _ContinueLoop
if found_to:
del msg['X-Originally-To']
msg['X-Originally-To'] = msg['To']
del msg['To']
msg['To'] = mlist.posting_address
# Post the message to the locked list
inq = Switchboard(config.INQUEUE_DIR)
inq.enqueue(msg,
listid=mlist.list_id,
fromusenet=True)
log.info('posted to list %s: %7d', listname, num)
except nntplib.NNTPError as e:
log.exception('NNTP error for list %s: %7d', listname, num)
except _ContinueLoop:
continue
# Even if we don't post the message because it was seen on the
# list already, update the watermark
mlist.usenet_watermark = num
def process_lists(glock):
for listname in config.list_manager.names:
glock.refresh()
# Open the list unlocked just to check to see if it is gating news to
# mail. If not, we're done with the list. Otherwise, lock the list
# and gate the group.
mlist = MailList.MailList(listname, lock=False)
if not mlist.gateway_to_mail:
continue
# Get the list's watermark, i.e. the last article number that we gated
# from news to mail. None means that this list has never polled its
# newsgroup and that we should do a catch up.
watermark = getattr(mlist, 'usenet_watermark', None)
# Open the newsgroup, but let most exceptions percolate up.
try:
conn, first, last = open_newsgroup(mlist)
except (socket.error, nntplib.NNTPError):
break
log.info('%s: [%d..%d]', listname, first, last)
try:
try:
if watermark is None:
mlist.Lock(timeout=config.LIST_LOCK_TIMEOUT)
# This is the first time we've tried to gate this
# newsgroup. We essentially do a mass catch-up, otherwise
# we'd flood the mailing list.
mlist.usenet_watermark = last
log.info('%s caught up to article %d', listname, last)
else:
# The list has been polled previously, so now we simply
# grab all the messages on the newsgroup that have not
# been seen by the mailing list. The first such article
# is the maximum of the lowest article available in the
# newsgroup and the watermark. It's possible that some
# articles have been expired since the last time gate_news
# has run. Not much we can do about that.
start = max(watermark + 1, first)
if start > last:
log.info('nothing new for list %s', listname)
else:
mlist.Lock(timeout=config.LIST_LOCK_TIMEOUT)
log.info('gating %s articles [%d..%d]',
listname, start, last)
# Use last+1 because poll_newsgroup() employes a for
# loop over range, and this will not include the last
# element in the list.
poll_newsgroup(mlist, conn, start, last + 1, glock)
except TimeOutError:
log.error('Could not acquire list lock: %s', listname)
finally:
if mlist.Locked():
mlist.Save()
mlist.Unlock()
log.info('%s watermark: %d', listname, mlist.usenet_watermark)
def main():
opts, args, parser = parseargs()
config.load(opts.config)
GATENEWS_LOCK_FILE = os.path.join(config.LOCK_DIR, 'gate_news.lock')
LOCK_LIFETIME = config.hours(2)
loginit.initialize(propagate=True)
log = logging.getLogger('mailman.fromusenet')
try:
with Lock(GATENEWS_LOCK_FILE,
# It's okay to hijack this
lifetime=LOCK_LIFETIME) as lock:
process_lists(lock)
clearcache()
except TimeOutError:
log.error('Could not acquire gate_news lock')
if __name__ == '__main__':
main()
|
