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|
# -*- coding: utf-8 -*-
# manager.py
# Copyright (C) 2015 LEAP
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
"""
VPN Tunnel.
"""
import os
import tempfile
from twisted.internet import reactor, defer
from twisted.logger import Logger
from leap.bitmask.system import IS_WIN
from ._config import _TempVPNConfig, _TempProviderConfig
from .process import VPNProcess
# The restarts are not really needed, since we're configuring
# openvpn to restart itself after a period of inactivity. However, if the
# openvpn process is killed by whatever reason, # we'll automatically try to
# restart the process.
RESTART_WAIT = 2 # in secs
class ConfiguredTunnel(object):
"""
A ConfiguredTunnel holds the configuration for a VPN connection, and allows
to control that connection.
This is the high-level object that the service knows about.
It exposes the start and terminate methods for the VPN Tunnel.
On start, it spawns a VPNProcess instance that will use a vpnlauncher
suited for the running platform and connect to the management interface
opened by the openvpn process, executing commands over that interface on
demand
"""
log = Logger()
def __init__(self, provider, remotes, cert_path, key_path, ca_path,
extra_flags):
"""
:param remotes: a list of gateways tuple (ip, port) looking like this:
((ip1, portA), (ip2, portB), ...)
:type remotes: tuple of tuple(str, int)
"""
self._remotes = remotes
ports = []
self._vpnconfig = _TempVPNConfig(extra_flags, cert_path, ports)
self._providerconfig = _TempProviderConfig(provider, ca_path)
host, port = _get_management_location()
self._host = host
self._port = port
self._vpnproc = None
@defer.inlineCallbacks
def start(self):
started = yield self._start_vpn()
defer.returnValue(started)
@defer.inlineCallbacks
def stop(self, restart=False):
stopped = yield self._stop_vpn(restart=restart)
defer.returnValue(stopped)
# status
@property
def status(self):
if not self._vpnproc:
status = {'status': 'off', 'error': None}
else:
status = self._vpnproc.status
# Currently, there's some UI flickering that needs to be debugged #9049
# print ">>>> STATUS", status
return status
@property
def traffic_status(self):
return self._vpnproc.traffic_status
# VPN Control
@defer.inlineCallbacks
def _start_vpn(self):
try:
self.log.debug('VPN: start')
args = [self._vpnconfig, self._providerconfig,
self._host, self._port]
kwargs = {'openvpn_verb': 4, 'remotes': self._remotes,
'restartfun': self._restart_vpn}
vpnproc = VPNProcess(*args, **kwargs)
self._vpnproc = vpnproc
self.__start_pre_up(vpnproc)
cmd = self.__start_get_cmd(vpnproc)
running = yield self.__start_spawn_proc(vpnproc, cmd)
vpnproc.pid = running.pid
defer.returnValue(True)
except Exception as exc:
if self._vpnproc:
self._vpnproc.failed = True
self._vpnproc.errmsg = exc.message
raise
def __start_pre_up(self, proc):
try:
proc.preUp()
except Exception as exc:
self.log.error('Error on vpn pre-up {0!r}'.format(exc))
raise
def __start_get_cmd(self, proc):
try:
cmd = proc.getCommand()
except Exception as exc:
self.log.error(
'Error while getting vpn command... {0!r}'.format(exc))
raise exc
return cmd
def __start_spawn_proc(self, proc, cmd):
env = os.environ
try:
running_p = reactor.spawnProcess(proc, cmd[0], cmd, env)
except Exception as exc:
self.log.error(
'Error while spawning vpn process... {0!r}'.format(exc))
raise exc
return running_p
@defer.inlineCallbacks
def _restart_vpn(self):
yield self.stop(restart=True)
reactor.callLater(
RESTART_WAIT, self.start)
@defer.inlineCallbacks
def _stop_vpn(self, restart=False):
"""
Stops the openvpn subprocess.
Attempts to send a SIGTERM first, and after a timeout
it sends a SIGKILL.
:param restart: whether this stop is part of a hard restart.
:type restart: bool
"""
# TODO how to return False if this fails
# XXX maybe return a deferred
if self._vpnproc is None:
self.log.debug('Tried to stop VPN but no process found')
defer.returnValue(False)
self._vpnproc.restarting = restart
self.__stop_pre_down(self._vpnproc)
stopped = yield self._vpnproc.terminate_or_kill()
defer.returnValue(stopped)
def __stop_pre_down(self, proc):
try:
proc.preDown()
except Exception as e:
self.log.error('Error on vpn pre-down {0!r}'.format(e))
raise
# utils
def _get_management_location():
"""
Return a tuple with the host (socket) and port to be used for VPN.
:return: (host, port)
:rtype: tuple (str, str)
"""
if IS_WIN:
host = "localhost"
port = "9876"
else:
host = os.path.join(
tempfile.mkdtemp(prefix="leap-tmp"), 'openvpn.socket')
port = "unix"
return host, port
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