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# -*- coding: utf-8 -*-
# process.py
# Copyright (C) 2013-2017 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 Process management.
A custom processProtocol launches the VPNProcess and connects to its management
interface.
"""
import os
import shutil
import socket
import subprocess
import sys
from itertools import chain, repeat
from twisted.internet import defer, protocol, reactor
from twisted.internet import error as internet_error
from twisted.internet.task import LoopingCall
from twisted.logger import Logger
from leap.bitmask.vpn.constants import IS_MAC
from leap.bitmask.vpn.utils import first, force_eval
from leap.bitmask.vpn.utils import get_vpn_launcher
from leap.bitmask.vpn.launchers import linux
from leap.bitmask.vpn.udstelnet import UDSTelnet
from leap.bitmask.vpn import _observer
from leap.bitmask.vpn import _management
logger = Logger()
# OpenVPN verbosity level - from flags.py
OPENVPN_VERBOSITY = 1
class VPNProcess(protocol.ProcessProtocol, _management.VPNManagement):
"""
A ProcessProtocol class that can be used to spawn a process that will
launch openvpn and connect to its management interface to control it
programmatically.
"""
def __init__(self, eipconfig, providerconfig, socket_host, socket_port,
signaler, openvpn_verb, remotes):
"""
:param eipconfig: eip configuration object
:type eipconfig: EIPConfig
:param providerconfig: provider specific configuration
:type providerconfig: ProviderConfig
:param socket_host: either socket path (unix) or socket IP
:type socket_host: str
:param socket_port: either string "unix" if it's a unix
socket, or port otherwise
:type socket_port: str
:param signaler: Signaler object used to receive notifications to the
backend
:type signaler: backend.Signaler
:param openvpn_verb: the desired level of verbosity in the
openvpn invocation
:type openvpn_verb: int
"""
_management.VPNManagement.__init__(self, signaler=signaler)
self._eipconfig = eipconfig
self._providerconfig = providerconfig
self._socket_host = socket_host
self._socket_port = socket_port
self._launcher = get_vpn_launcher()
self._last_state = None
self._last_status = None
self._alive = False
# XXX use flags, maybe, instead of passing
# the parameter around.
self._openvpn_verb = openvpn_verb
self._vpn_observer = _observer.VPNObserver(signaler)
self.is_restart = False
self._remotes = remotes
# processProtocol methods
def connectionMade(self):
"""
Called when the connection is made.
.. seeAlso: `http://twistedmatrix.com/documents/13.0.0/api/twisted.internet.protocol.ProcessProtocol.html` # noqa
"""
self._alive = True
self.aborted = False
self.try_to_connect_to_management(max_retries=10)
def outReceived(self, data):
"""
Called when new data is available on stdout.
:param data: the data read on stdout
.. seeAlso: `http://twistedmatrix.com/documents/13.0.0/api/twisted.internet.protocol.ProcessProtocol.html` # noqa
"""
# truncate the newline
line = data[:-1]
logger.info(line)
self._vpn_observer.watch(line)
def processExited(self, reason):
"""
Called when the child process exits.
.. seeAlso: `http://twistedmatrix.com/documents/13.0.0/api/twisted.internet.protocol.ProcessProtocol.html` # noqa
"""
exit_code = reason.value.exitCode
if isinstance(exit_code, int):
logger.debug("processExited, status %d" % (exit_code,))
if self._signaler is not None:
self._signaler.signal(
self._signaler.eip_process_finished, exit_code)
self._alive = False
def processEnded(self, reason):
"""
Called when the child process exits and all file descriptors associated
with it have been closed.
.. seeAlso: `http://twistedmatrix.com/documents/13.0.0/api/twisted.internet.protocol.ProcessProtocol.html` # noqa
"""
exit_code = reason.value.exitCode
if isinstance(exit_code, int):
logger.debug("processEnded, status %d" % (exit_code,))
# polling
def pollStatus(self):
"""
Polls connection status.
"""
if self._alive:
self.get_status()
def pollState(self):
"""
Polls connection state.
"""
if self._alive:
self.get_state()
# launcher
def getCommand(self):
"""
Gets the vpn command from the aproppriate launcher.
Might throw:
VPNLauncherException,
OpenVPNNotFoundException.
:rtype: list of str
"""
command = self._launcher.get_vpn_command(
eipconfig=self._eipconfig,
providerconfig=self._providerconfig,
socket_host=self._socket_host,
socket_port=self._socket_port,
openvpn_verb=self._openvpn_verb,
remotes=self._remotes)
encoding = sys.getfilesystemencoding()
for i, c in enumerate(command):
if not isinstance(c, str):
command[i] = c.encode(encoding)
logger.debug("Running VPN with command: ")
logger.debug("{0}".format(" ".join(command)))
return command
def getGateways(self):
"""
Get the gateways from the appropiate launcher.
:rtype: list
"""
gateways_ports = self._launcher.get_gateways(
self._eipconfig, self._providerconfig)
# filter out ports since we don't need that info
return [gateway for gateway, port in gateways_ports]
# shutdown
def killProcess(self):
"""
Sends the KILL signal to the running process.
"""
try:
self.transport.signalProcess('KILL')
except internet_error.ProcessExitedAlready:
logger.debug('Process Exited Already')
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