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main.py
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main.py
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#!/usr/bin/env python3
#
# DHCPy6d DHCPv6 Daemon
#
# Copyright (C) 2009-2021 Henri Wahl <henri@dhcpy6d.de>
#
# 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
import distro
import sys
# access /usr/share/pyshared on Debian
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=715010
if distro.id() == 'debian':
sys.path[0:0] = ['/usr/share/pyshared']
import grp
import pwd
import os
import socket
from dhcpy6d import UDPMulticastIPv6
from dhcpy6d.config import cfg
from dhcpy6d.globals import (config_answer_queue,
config_query_queue,
IF_NAME,
route_queue,
volatile_answer_queue,
volatile_query_queue)
from dhcpy6d.log import log
from dhcpy6d.handler import RequestHandler
from dhcpy6d.route import manage_prefixes_routes
from dhcpy6d.storage import (config_store,
QueryQueue,
volatile_store)
from dhcpy6d.threads import (DNSQueryThread,
RouteThread,
TidyUpThread,
TimerThread)
# main part, initializing all stuff
def run():
log.info('Starting dhcpy6d daemon...')
log.info(f'Server DUID: {cfg.SERVERDUID}')
# configure SocketServer
UDPMulticastIPv6.address_family = socket.AF_INET6
udp_server = UDPMulticastIPv6(('', 547), RequestHandler)
# start query queue watcher
config_query_queue_watcher = QueryQueue(name='config_query_queue',
store_type=config_store,
query_queue=config_query_queue,
answer_queue=config_answer_queue)
config_query_queue_watcher.start()
volatile_query_queue_watcher = QueryQueue(name='volatile_query_queue',
store_type=volatile_store,
query_queue=volatile_query_queue,
answer_queue=volatile_answer_queue)
volatile_query_queue_watcher.start()
# check if database tables are up-to-date or exist and create them if not
volatile_store.check_storage()
# check if config database - if any - supports prefixes
config_store.check_config_prefixes_support()
# if global dynamic prefix was not given take it from database - only possible after database initialisation
if cfg.PREFIX == '':
cfg.PREFIX = volatile_store.get_dynamic_prefix()
if cfg.PREFIX is None:
cfg.PREFIX = ''
# apply dynamic prefix to addresses and prefixes
for a in cfg.ADDRESSES:
cfg.ADDRESSES[a].inject_dynamic_prefix_into_prototype(cfg.PREFIX)
for p in cfg.PREFIXES:
cfg.PREFIXES[p].inject_dynamic_prefix_into_prototype(cfg.PREFIX)
# collect all known MAC addresses from database
if cfg.CACHE_MAC_LLIP:
volatile_store.collect_macs_from_db()
# start timer
timer_thread = TimerThread()
timer_thread.start()
# start route queue to care for routes in background
route_thread = RouteThread(route_queue)
route_thread.start()
# delete invalid and add valid routes - useful after reboot
if cfg.MANAGE_ROUTES_AT_START:
manage_prefixes_routes()
# start TidyUp thread for cleaning in background
tidyup_thread = TidyUpThread()
tidyup_thread.start()
# start DNS query queue to care for DNS in background
dns_query_thread = DNSQueryThread()
dns_query_thread.start()
# set user and group
log.info(f'Running as user {cfg.USER} (UID {pwd.getpwnam(cfg.USER).pw_uid}) and '
f'group {cfg.GROUP} (GID {grp.getgrnam(cfg.GROUP).gr_gid})')
# first set group because otherwise the freshly unprivileged user could not modify its groups itself
os.setgid(grp.getgrnam(cfg.GROUP).gr_gid)
os.setuid(pwd.getpwnam(cfg.USER).pw_uid)
# log interfaces
log.info(f'Listening on interfaces: {" ".join(IF_NAME)}')
# serve forever
try:
udp_server.serve_forever()
except KeyboardInterrupt:
sys.exit(0)
if __name__ == '__main__':
run()