[feature] initial port of legacy vpn code

non functional at the moment, but started doing some cleanup

1 files changed, 920 insertions, 0 deletions

diff --git a/src/leap/bitmask/vpn/process.py b/src/leap/bitmask/vpn/process.py
new file mode 100644
index 00000000..05847e21
--- /dev/null
+++ b/src/leap/bitmask/vpn/process.py
@@ -0,0 +1,920 @@
+# -*- 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 Manager, spawned in a custom processProtocol.
+"""
+
+import os
+import shutil
+import socket
+import subprocess
+import sys
+
+from itertools import chain, repeat
+
+import psutil
+try:
+    # psutil < 2.0.0
+    from psutil.error import AccessDenied as psutil_AccessDenied
+    PSUTIL_2 = False
+except ImportError:
+    # psutil >= 2.0.0
+    from psutil import AccessDenied as psutil_AccessDenied
+    PSUTIL_2 = True
+
+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
+
+logger = Logger()
+
+
+# OpenVPN verbosity level - from flags.py
+OPENVPN_VERBOSITY = 1
+
+
+class VPNObserver(object):
+    """
+    A class containing different patterns in the openvpn output that
+    we can react upon.
+    """
+
+    # TODO this is i18n-sensitive, right?
+    # in that case, we should add the translations :/
+    # until we find something better.
+
+    _events = {
+        'NETWORK_UNREACHABLE': (
+            'Network is unreachable (code=101)',),
+        'PROCESS_RESTART_TLS': (
+            "SIGTERM[soft,tls-error]",),
+        'PROCESS_RESTART_PING': (
+            "SIGTERM[soft,ping-restart]",),
+        'INITIALIZATION_COMPLETED': (
+            "Initialization Sequence Completed",),
+    }
+
+    def __init__(self, signaler=None):
+        self._signaler = signaler
+
+    def watch(self, line):
+        """
+        Inspects line searching for the different patterns. If a match
+        is found, try to emit the corresponding signal.
+
+        :param line: a line of openvpn output
+        :type line: str
+        """
+        chained_iter = chain(*[
+            zip(repeat(key, len(l)), l)
+            for key, l in self._events.iteritems()])
+        for event, pattern in chained_iter:
+            if pattern in line:
+                logger.debug('pattern matched! %s' % pattern)
+                break
+        else:
+            return
+
+        sig = self._get_signal(event)
+        if sig is not None:
+            if self._signaler is not None:
+                self._signaler.signal(sig)
+            return
+        else:
+            logger.debug('We got %s event from openvpn output but we could '
+                         'not find a matching signal for it.' % event)
+
+    def _get_signal(self, event):
+        """
+        Tries to get the matching signal from the eip signals
+        objects based on the name of the passed event (in lowercase)
+
+        :param event: the name of the event that we want to get a signal for
+        :type event: str
+        :returns: a Signaler signal or None
+        :rtype: str or None
+        """
+        if self._signaler is None:
+            return
+        sig = self._signaler
+        signals = {
+            "network_unreachable": sig.eip_network_unreachable,
+            "process_restart_tls": sig.eip_process_restart_tls,
+            "process_restart_ping": sig.eip_process_restart_ping,
+            "initialization_completed": sig.eip_connected
+        }
+        return signals.get(event.lower())
+
+
+class OpenVPNAlreadyRunning(Exception):
+    message = ("Another openvpn instance is already running, and could "
+               "not be stopped.")
+
+
+class AlienOpenVPNAlreadyRunning(Exception):
+    message = ("Another openvpn instance is already running, and could "
+               "not be stopped because it was not launched by LEAP.")
+
+
+class VPN(object):
+    """
+    This is the high-level object that the GUI is dealing with.
+    It exposes the start and terminate methods.
+
+    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.
+    """
+    TERMINATE_MAXTRIES = 10
+    TERMINATE_WAIT = 1  # secs
+
+    OPENVPN_VERB = "openvpn_verb"
+
+    def __init__(self, **kwargs):
+        """
+        Instantiate empty attributes and get a copy
+        of a QObject containing the QSignals that we will pass along
+        to the VPNManager.
+        """
+        self._vpnproc = None
+        self._pollers = []
+
+        self._signaler = kwargs['signaler']
+        # self._openvpn_verb = flags.OPENVPN_VERBOSITY
+        self._openvpn_verb = None
+
+        self._user_stopped = False
+        self._remotes = kwargs['remotes']
+
+    def start(self, *args, **kwargs):
+        """
+        Starts the openvpn subprocess.
+
+        :param args: args to be passed to the VPNProcess
+        :type args: tuple
+
+        :param kwargs: kwargs to be passed to the VPNProcess
+        :type kwargs: dict
+        """
+        logger.debug('VPN: start')
+        self._user_stopped = False
+        self._stop_pollers()
+        kwargs['openvpn_verb'] = self._openvpn_verb
+        kwargs['signaler'] = self._signaler
+        kwargs['remotes'] = self._remotes
+
+        # start the main vpn subprocess
+        vpnproc = VPNProcess(*args, **kwargs)
+
+        if vpnproc.get_openvpn_process():
+            logger.info("Another vpn process is running. Will try to stop it.")
+            vpnproc.stop_if_already_running()
+
+        # FIXME it would be good to document where the
+        # errors here are catched, since we currently handle them
+        # at the frontend layer. This *should* move to be handled entirely
+        # in the backend.
+        # exception is indeed technically catched in backend, then converted
+        # into a signal, that is catched in the eip_status widget in the
+        # frontend, and converted into a signal to abort the connection that is
+        # sent to the backend again.
+
+        # the whole exception catching should be done in the backend, without
+        # the ping-pong to the frontend, and without adding any logical checks
+        # in the frontend. We should just communicate UI changes to frontend,
+        # and abstract us away from anything else.
+        try:
+            cmd = vpnproc.getCommand()
+        except Exception as e:
+            logger.error("Error while getting vpn command... {0!r}".format(e))
+            raise
+
+        env = os.environ
+        for key, val in vpnproc.vpn_env.items():
+            env[key] = val
+
+        reactor.spawnProcess(vpnproc, cmd[0], cmd, env)
+        self._vpnproc = vpnproc
+
+        # add pollers for status and state
+        # this could be extended to a collection of
+        # generic watchers
+
+        poll_list = [LoopingCall(vpnproc.pollStatus),
+                     LoopingCall(vpnproc.pollState)]
+        self._pollers.extend(poll_list)
+        self._start_pollers()
+
+    def bitmask_root_vpn_down(self):
+        """
+        Bring openvpn down using the privileged wrapper.
+        """
+        if IS_MAC:
+            # We don't support Mac so far
+            return True
+        BM_ROOT = force_eval(linux.LinuxVPNLauncher.BITMASK_ROOT)
+
+        # FIXME -- port to processProtocol
+        exitCode = subprocess.call(["pkexec",
+                                    BM_ROOT, "openvpn", "stop"])
+        return True if exitCode is 0 else False
+
+    def _kill_if_left_alive(self, tries=0):
+        """
+        Check if the process is still alive, and send a
+        SIGKILL after a timeout period.
+
+        :param tries: counter of tries, used in recursion
+        :type tries: int
+        """
+        while tries < self.TERMINATE_MAXTRIES:
+            if self._vpnproc.transport.pid is None:
+                logger.debug("Process has been happily terminated.")
+                return
+            else:
+                logger.debug("Process did not die, waiting...")
+
+            tries += 1
+            reactor.callLater(self.TERMINATE_WAIT,
+                              self._kill_if_left_alive, tries)
+            return
+
+        # after running out of patience, we try a killProcess
+        logger.debug("Process did not died. Sending a SIGKILL.")
+        try:
+            self.killit()
+        except OSError:
+            logger.error("Could not kill process!")
+
+    def killit(self):
+        """
+        Sends a kill signal to the process.
+        """
+        self._stop_pollers()
+        if self._vpnproc is None:
+            logger.debug("There's no vpn process running to kill.")
+        else:
+            self._vpnproc.aborted = True
+            self._vpnproc.killProcess()
+
+    def terminate(self, shutdown=False, restart=False):
+        """
+        Stops the openvpn subprocess.
+
+        Attempts to send a SIGTERM first, and after a timeout
+        it sends a SIGKILL.
+
+        :param shutdown: whether this is the final shutdown
+        :type shutdown: bool
+        :param restart: whether this stop is part of a hard restart.
+        :type restart: bool
+        """
+        self._stop_pollers()
+
+        # First we try to be polite and send a SIGTERM...
+        if self._vpnproc is not None:
+            # We assume that the only valid stops are initiated
+            # by an user action, not hard restarts
+            self._user_stopped = not restart
+            self._vpnproc.is_restart = restart
+
+            self._sentterm = True
+            self._vpnproc.terminate_openvpn(shutdown=shutdown)
+
+            # ...but we also trigger a countdown to be unpolite
+            # if strictly needed.
+            reactor.callLater(
+                self.TERMINATE_WAIT, self._kill_if_left_alive)
+        else:
+            logger.debug("VPN is not running.")
+
+    def _start_pollers(self):
+        """
+        Iterate through the registered observers
+        and start the looping call for them.
+        """
+        for poller in self._pollers:
+            poller.start(VPNManager.POLL_TIME)
+
+    def _stop_pollers(self):
+        """
+        Iterate through the registered observers
+        and stop the looping calls if they are running.
+        """
+        for poller in self._pollers:
+            if poller.running:
+                poller.stop()
+        self._pollers = []
+
+
+class VPNManager(object):
+    """
+    This is a mixin that we use in the VPNProcess class.
+    Here we get together all methods related with the openvpn management
+    interface.
+
+    A copy of a QObject containing signals as attributes is passed along
+    upon initialization, and we use that object to emit signals to qt-land.
+
+    For more info about management methods::
+
+      zcat `dpkg -L openvpn | grep management`
+    """
+
+    # Timers, in secs
+    # NOTE: We need to set a bigger poll time in OSX because it seems
+    # openvpn malfunctions when you ask it a lot of things in a short
+    # amount of time.
+    POLL_TIME = 2.5 if IS_MAC else 1.0
+    CONNECTION_RETRY_TIME = 1
+
+    def __init__(self, signaler=None):
+        """
+        Initializes the VPNManager.
+
+        :param signaler: Signaler object used to send notifications to the
+                         backend
+        :type signaler: backend.Signaler
+        """
+        self._tn = None
+        self._signaler = signaler
+        self._aborted = False
+
+    @property
+    def aborted(self):
+        return self._aborted
+
+    @aborted.setter
+    def aborted(self, value):
+        self._aborted = value
+
+    def _seek_to_eof(self):
+        """
+        Read as much as available. Position seek pointer to end of stream
+        """
+        try:
+            self._tn.read_eager()
+        except EOFError:
+            logger.debug("Could not read from socket. Assuming it died.")
+            return
+
+    def _send_command(self, command, until=b"END"):
+        """
+        Sends a command to the telnet connection and reads until END
+        is reached.
+
+        :param command: command to send
+        :type command: str
+
+        :param until: byte delimiter string for reading command output
+        :type until: byte str
+
+        :return: response read
+        :rtype: list
+        """
+        # leap_assert(self._tn, "We need a tn connection!")
+
+        try:
+            self._tn.write("%s\n" % (command,))
+            buf = self._tn.read_until(until, 2)
+            self._seek_to_eof()
+            blist = buf.split('\r\n')
+            if blist[-1].startswith(until):
+                del blist[-1]
+                return blist
+            else:
+                return []
+
+        except socket.error:
+            # XXX should get a counter and repeat only
+            # after mod X times.
+            logger.warning('socket error (command was: "%s")' % (command,))
+            self._close_management_socket(announce=False)
+            logger.debug('trying to connect to management again')
+            self.try_to_connect_to_management(max_retries=5)
+            return []
+
+        # XXX should move this to a errBack!
+        except Exception as e:
+            logger.warning("Error sending command %s: %r" %
+                           (command, e))
+        return []
+
+    def _close_management_socket(self, announce=True):
+        """
+        Close connection to openvpn management interface.
+        """
+        logger.debug('closing socket')
+        if announce:
+            self._tn.write("quit\n")
+            self._tn.read_all()
+        self._tn.get_socket().close()
+        self._tn = None
+
+    def _connect_management(self, socket_host, socket_port):
+        """
+        Connects to the management interface on the specified
+        socket_host socket_port.
+
+        :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
+        """
+        if self.is_connected():
+            self._close_management_socket()
+
+        try:
+            self._tn = UDSTelnet(socket_host, socket_port)
+
+            # XXX make password optional
+            # specially for win. we should generate
+            # the pass on the fly when invoking manager
+            # from conductor
+
+            # self.tn.read_until('ENTER PASSWORD:', 2)
+            # self.tn.write(self.password + '\n')
+            # self.tn.read_until('SUCCESS:', 2)
+            if self._tn:
+                self._tn.read_eager()
+
+        # XXX move this to the Errback
+        except Exception as e:
+            logger.warning("Could not connect to OpenVPN yet: %r" % (e,))
+            self._tn = None
+
+    def _connectCb(self, *args):
+        """
+        Callback for connection.
+
+        :param args: not used
+        """
+        if self._tn:
+            logger.info('Connected to management')
+        else:
+            logger.debug('Cannot connect to management...')
+
+    def _connectErr(self, failure):
+        """
+        Errorback for connection.
+
+        :param failure: Failure
+        """
+        logger.warning(failure)
+
+    def connect_to_management(self, host, port):
+        """
+        Connect to a management interface.
+
+        :param host: the host of the management interface
+        :type host: str
+
+        :param port: the port of the management interface
+        :type port: str
+
+        :returns: a deferred
+        """
+        self.connectd = defer.maybeDeferred(
+            self._connect_management, host, port)
+        self.connectd.addCallbacks(self._connectCb, self._connectErr)
+        return self.connectd
+
+    def is_connected(self):
+        """
+        Returns the status of the management interface.
+
+        :returns: True if connected, False otherwise
+        :rtype: bool
+        """
+        return True if self._tn else False
+
+    def try_to_connect_to_management(self, retry=0, max_retries=None):
+        """
+        Attempts to connect to a management interface, and retries
+        after CONNECTION_RETRY_TIME if not successful.
+
+        :param retry: number of the retry
+        :type retry: int
+        """
+        if max_retries and retry > max_retries:
+            logger.warning("Max retries reached while attempting to connect "
+                           "to management. Aborting.")
+            self.aborted = True
+            return
+
+        # _alive flag is set in the VPNProcess class.
+        if not self._alive:
+            logger.debug('Tried to connect to management but process is '
+                         'not alive.')
+            return
+        logger.debug('trying to connect to management')
+        if not self.aborted and not self.is_connected():
+            self.connect_to_management(self._socket_host, self._socket_port)
+            reactor.callLater(
+                self.CONNECTION_RETRY_TIME,
+                self.try_to_connect_to_management, retry + 1)
+
+    def _parse_state_and_notify(self, output):
+        """
+        Parses the output of the state command and emits state_changed
+        signal when the state changes.
+
+        :param output: list of lines that the state command printed as
+                       its output
+        :type output: list
+        """
+        for line in output:
+            stripped = line.strip()
+            if stripped == "END":
+                continue
+            parts = stripped.split(",")
+            if len(parts) < 5:
+                continue
+            ts, status_step, ok, ip, remote = parts
+
+            state = status_step
+            if state != self._last_state:
+                if self._signaler is not None:
+                    self._signaler.signal(self._signaler.eip_state_changed, state)
+                self._last_state = state
+
+    def _parse_status_and_notify(self, output):
+        """
+        Parses the output of the status command and emits
+        status_changed signal when the status changes.
+
+        :param output: list of lines that the status command printed
+                       as its output
+        :type output: list
+        """
+        tun_tap_read = ""
+        tun_tap_write = ""
+
+        for line in output:
+            stripped = line.strip()
+            if stripped.endswith("STATISTICS") or stripped == "END":
+                continue
+            parts = stripped.split(",")
+            if len(parts) < 2:
+                continue
+
+            text, value = parts
+            # text can be:
+            #   "TUN/TAP read bytes"
+            #   "TUN/TAP write bytes"
+            #   "TCP/UDP read bytes"
+            #   "TCP/UDP write bytes"
+            #   "Auth read bytes"
+
+            if text == "TUN/TAP read bytes":
+                tun_tap_read = value  # download
+            elif text == "TUN/TAP write bytes":
+                tun_tap_write = value  # upload
+
+        status = (tun_tap_read, tun_tap_write)
+        if status != self._last_status:
+            if self._signaler is not None:
+                self._signaler.signal(self._signaler.eip_status_changed, status)
+            self._last_status = status
+
+    def get_state(self):
+        """
+        Notifies the gui of the output of the state command over
+        the openvpn management interface.
+        """
+        if self.is_connected():
+            return self._parse_state_and_notify(self._send_command("state"))
+
+    def get_status(self):
+        """
+        Notifies the gui of the output of the status command over
+        the openvpn management interface.
+        """
+        if self.is_connected():
+            return self._parse_status_and_notify(self._send_command("status"))
+
+    @property
+    def vpn_env(self):
+        """
+        Return a dict containing the vpn environment to be used.
+        """
+        return self._launcher.get_vpn_env()
+
+    def terminate_openvpn(self, shutdown=False):
+        """
+        Attempts to terminate openvpn by sending a SIGTERM.
+        """
+        if self.is_connected():
+            self._send_command("signal SIGTERM")
+        if shutdown:
+            self._cleanup_tempfiles()
+
+    def _cleanup_tempfiles(self):
+        """
+        Remove all temporal files we might have left behind.
+
+        Iif self.port is 'unix', we have created a temporal socket path that,
+        under normal circumstances, we should be able to delete.
+        """
+        if self._socket_port == "unix":
+            logger.debug('cleaning socket file temp folder')
+            tempfolder = first(os.path.split(self._socket_host))
+            if tempfolder and os.path.isdir(tempfolder):
+                try:
+                    shutil.rmtree(tempfolder)
+                except OSError:
+                    logger.error('could not delete tmpfolder %s' % tempfolder)
+
+    def get_openvpn_process(self):
+        """
+        Looks for openvpn instances running.
+
+        :rtype: process
+        """
+        openvpn_process = None
+        for p in psutil.process_iter():
+            try:
+                # XXX Not exact!
+                # Will give false positives.
+                # we should check that cmdline BEGINS
+                # with openvpn or with our wrapper
+                # (pkexec / osascript / whatever)
+
+                # This needs more work, see #3268, but for the moment
+                # we need to be able to filter out arguments in the form
+                # --openvpn-foo, since otherwise we are shooting ourselves
+                # in the feet.
+
+                if PSUTIL_2:
+                    cmdline = p.cmdline()
+                else:
+                    cmdline = p.cmdline
+                if any(map(lambda s: s.find(
+                        "LEAPOPENVPN") != -1, cmdline)):
+                    openvpn_process = p
+                    break
+            except psutil_AccessDenied:
+                pass
+        return openvpn_process
+
+    def stop_if_already_running(self):
+        """
+        Checks if VPN is already running and tries to stop it.
+
+        Might raise OpenVPNAlreadyRunning.
+
+        :return: True if stopped, False otherwise
+
+        """
+        process = self.get_openvpn_process()
+        if not process:
+            logger.debug('Could not find openvpn process while '
+                         'trying to stop it.')
+            return
+
+        logger.debug("OpenVPN is already running, trying to stop it...")
+        cmdline = process.cmdline
+
+        manag_flag = "--management"
+        if isinstance(cmdline, list) and manag_flag in cmdline:
+            # we know that our invocation has this distinctive fragment, so
+            # we use this fingerprint to tell other invocations apart.
+            # this might break if we change the configuration path in the
+            # launchers
+            smellslikeleap = lambda s: "leap" in s and "providers" in s
+
+            if not any(map(smellslikeleap, cmdline)):
+                logger.debug("We cannot stop this instance since we do not "
+                             "recognise it as a leap invocation.")
+                raise AlienOpenVPNAlreadyRunning
+
+            try:
+                index = cmdline.index(manag_flag)
+                host = cmdline[index + 1]
+                port = cmdline[index + 2]
+                logger.debug("Trying to connect to %s:%s"
+                             % (host, port))
+                self.connect_to_management(host, port)
+
+                # XXX this has a problem with connections to different
+                # remotes. So the reconnection will only work when we are
+                # terminating instances left running for the same provider.
+                # If we are killing an openvpn instance configured for another
+                # provider, we will get:
+                # TLS Error: local/remote TLS keys are out of sync
+                # However, that should be a rare case right now.
+                self._send_command("signal SIGTERM")
+                self._close_management_socket(announce=True)
+            except (Exception, AssertionError) as e:
+                logger.warning("Problem trying to terminate OpenVPN: %r"
+                               % (e,))
+        else:
+            logger.debug("Could not find the expected openvpn command line.")
+
+        process = self.get_openvpn_process()
+        if process is None:
+            logger.debug("Successfully finished already running "
+                         "openvpn process.")
+            return True
+        else:
+            logger.warning("Unable to terminate OpenVPN")
+            raise OpenVPNAlreadyRunning
+
+
+class VPNProcess(protocol.ProcessProtocol, VPNManager):
+    """
+    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
+        """
+        VPNManager.__init__(self, signaler=signaler)
+        # leap_assert(not self.isRunning(), "Starting process more than once!")
+
+        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 = 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
+        """
+        print self._remotes
+        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')