#! @PYTHON@
#
# Copyright (C) 1998-2018 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.
"""Poll the NNTP servers for messages to be gatewayed to mailing lists.
Usage: gate_news [options]
Where options are
--help
-h
Print this text and exit.
"""
import sys
import os
import time
import getopt
import socket
import nntplib
import paths
# Import this /after/ paths so that the sys.path is properly hacked
import email.Errors
from email.Parser import Parser
from Mailman import mm_cfg
from Mailman import MailList
from Mailman import Utils
from Mailman import Message
from Mailman import LockFile
from Mailman.i18n import _
from Mailman.Queue.sbcache import get_switchboard
from Mailman.Logging.Utils import LogStdErr
from Mailman.Logging.Syslog import syslog
# Work around known problems with some RedHat cron daemons
import signal
signal.signal(signal.SIGCHLD, signal.SIG_DFL)
GATENEWS_LOCK_FILE = os.path.join(mm_cfg.LOCK_DIR, 'gate_news.lock')
LogStdErr('error', 'gate_news', manual_reprime=0)
LOCK_LIFETIME = mm_cfg.hours(2)
NL = '\n'
# Continues inside try: block are not allowed in Python versions before 2.1.
# This exception is used to work around that.
class _ContinueLoop(Exception):
pass
try:
True, False
except NameError:
True = 1
False = 0
def usage(code, msg=''):
if code:
fd = sys.stderr
else:
fd = sys.stdout
print >> fd, _(__doc__)
if msg:
print >> fd, msg
sys.exit(code)
_hostcache = {}
def open_newsgroup(mlist):
# Split host:port if given
nntp_host, nntp_port = Utils.nntpsplit(mlist.nntp_host)
# 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=mm_cfg.NNTP_USERNAME,
password=mm_cfg.NNTP_PASSWORD)
except (socket.error, nntplib.NNTPError, IOError, EOFError), e:
syslog('fromusenet',
'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():
reverse = {}
for conn in _hostcache.values():
reverse[conn] = 1
for conn in reverse.keys():
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(`num`)[3]
# I don't know how this happens, but skip an empty message.
if not headers:
raise _ContinueLoop
found_to = 0
beenthere = 0
for header in headers:
i = header.find(':')
value = header[:i].lower()
if i > 0 and value == 'to':
found_to = 1
if value <> 'x-beenthere':
continue
if header[i:] == ': %s' % mlist.GetListEmail():
beenthere = 1
break
if not beenthere:
body = conn.body(`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, e:
syslog('fromusenet',
'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.GetListEmail()
# Post the message to the locked list
inq = get_switchboard(mm_cfg.INQUEUE_DIR)
inq.enqueue(msg,
listname = mlist.internal_name(),
fromusenet = 1)
syslog('fromusenet',
'posted to list %s: %7d' % (listname, num))
except nntplib.NNTPError, e:
syslog('fromusenet',
'NNTP error for list %s: %7d' % (listname, num))
syslog('fromusenet', str(e))
except _ContinueLoop:
continue
# Even if we don't post the message because it was seen on the
# list already, or if we skipped it as unparseable or empty,
# update the watermark. Note this used to be in the 'for' block
# but if the last message(s) raised _ContinueLoop, they wouldn't
# update the watermark.
mlist.usenet_watermark = num
def process_lists(glock):
for listname in Utils.list_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=0)
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, IOError, EOFError), e:
syslog('fromusenet',
"%s: couldn't open newsgroup %s: skipping\n%s",
listname, mlist.linked_newsgroup, e)
continue
syslog('fromusenet', '%s: [%d..%d]' % (listname, first, last))
try:
try:
if watermark is None:
mlist.Lock(timeout=mm_cfg.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
syslog('fromusenet', '%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:
syslog('fromusenet', 'nothing new for list %s' %
listname)
else:
mlist.Lock(timeout=mm_cfg.LIST_LOCK_TIMEOUT)
syslog('fromusenet', '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 LockFile.TimeOutError:
syslog('fromusenet', 'Could not acquire list lock: %s' %
listname)
finally:
if mlist.Locked():
mlist.Save()
mlist.Unlock()
syslog('fromusenet', '%s watermark: %d' %
(listname, mlist.usenet_watermark))
def main():
lock = LockFile.LockFile(GATENEWS_LOCK_FILE,
# it's okay to hijack this
lifetime=LOCK_LIFETIME)
try:
lock.lock(timeout=0.5)
except LockFile.TimeOutError:
syslog('fromusenet', 'Could not acquire gate_news lock')
return
try:
process_lists(lock)
finally:
clearcache()
lock.unlock(unconditionally=1)
if __name__ == '__main__':
try:
opts, args = getopt.getopt(sys.argv[1:], 'h', ['help'])
except getopt.error, msg:
usage(1, msg)
if args:
usage(1, 'No args are expected')
for opt, arg in opts:
if opt in ('-h', '--help'):
usage(0)
main()
