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+# -*- coding: utf-8 -*-
+# management.py
+# Copyright (c) 2012 Mike Mattice
+# Copyright (C) 2017 LEAP Encryption Access Project
+#
+# 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/>.
+
+"""
+Handles an OpenVPN process through its Management Interface.
+"""
+
+import time
+from collections import OrderedDict
+
+from twisted.internet import defer
+from twisted.protocols.basic import LineReceiver
+from twisted.internet.defer import Deferred
+from twisted.python import log
+
+from zope.interface import Interface
+
+from _human import bytes2human
+
+
+class IStateListener(Interface):
+
+ def change_state(self, state):
+ pass
+
+
+class ManagementProtocol(LineReceiver):
+
+ def __init__(self, verbose=False):
+
+ self.verbose = verbose
+ self.state = None
+ self.remote = None
+ self.rport = None
+ self.traffic = TrafficCounter()
+ self.openvpn_version = ''
+ self.pid = None
+
+ self._defs = []
+ self._statelog = OrderedDict()
+ self._linebuf = []
+ self._state_listeners = set([])
+
+ def addStateListener(self, listener):
+ """
+ A Listener must implement change_state method,
+ and it will be called with a State object.
+ """
+ self._state_listeners.add(listener)
+
+ def getStateHistory(self):
+ return self._statelog
+
+ def lineReceived(self, line):
+ if self.verbose:
+ print line
+
+ if line[0] == '>':
+ try:
+ infotype, data = line[1:].split(':', 1)
+ infotype = infotype.replace('-', '_')
+ except Exception, msg:
+ print "failed to parse '%r': %s" % (line, msg)
+ raise
+ m = getattr(self, '_handle_%s' % infotype, None)
+ if m:
+ try:
+ m(data)
+ except Exception, msg:
+ print "Failure in _handle_%s: %s" % (infotype, msg)
+ else:
+ self._handle_unknown(infotype, data)
+ else:
+ if line.strip() == 'END':
+ try:
+ d = self._defs.pop(0)
+ d.callback('\n'.join(self._linebuf))
+ except IndexError:
+ pass
+ self._linebuf = []
+ return
+ try:
+ status, data = line.split(': ', 1)
+ except ValueError:
+ print "ERROR PARSING:", line
+ return
+ if status in ('ERROR', 'SUCCESS'):
+ try:
+ d = self._defs.pop(0)
+ if status == 'SUCCESS':
+ d.callback(line)
+ else:
+ d.errback(line)
+ except:
+ pass
+ else:
+ self._linebuf.append(line)
+
+ def _handle_unknown(self, infotype, data):
+ log.msg('Received unhandled infotype %s with data %s' %
+ (infotype, data))
+
+ def _handle_BYTECOUNT(self, data):
+ down, up = data.split(',')
+ self.traffic.update(down, up, time.time())
+
+ def _handle_ECHO(self, data):
+ pass
+
+ def _handle_FATAL(self, data):
+ pass
+
+ def _handle_HOLD(self, data):
+ pass
+
+ def _handle_INFO(self, data):
+ pass
+
+ def _handle_LOG(self, data):
+ pass
+
+ def _handle_NEED_OK(self, data):
+ pass
+
+ def _handle_NEED_STR(self, data):
+ pass
+
+ def _handle_STATE(self, data):
+ data = data.strip().split(',')
+ remote = rport = None
+ try:
+ if len(data) == 9:
+ (ts, state, verbose, localtun,
+ remote, rport, laddr, lport, ip6) = data
+ elif len(data) == 8:
+ ts, state = data[:2]
+ except Exception as exc:
+ print "ERROR", exc
+ log.error('Failure parsing data: %s' % exc)
+
+ if state != self.state:
+ now = time.time()
+ stateobj = State(state, ts)
+ self._statelog[now] = stateobj
+ for listener in self._state_listeners:
+ listener.change_state(stateobj)
+ self.state = stateobj
+ self.remote = remote
+ self.rport = rport
+
+ def _pushdef(self):
+ d = Deferred()
+ self._defs.append(d)
+ return d
+
+ def byteCount(self, interval=0):
+ d = self._pushdef()
+ self.sendLine('bytecount %d' % (interval,))
+ return d
+
+ def signal(self, signal='SIGTERM'):
+ d = self._pushdef()
+ self.sendLine('signal %s' % (signal,))
+ return d
+
+ def _parseHoldstatus(self, result):
+ return result.split('=')[0] == '1'
+
+ def hold(self, p=''):
+ d = self._pushdef()
+ self.sendLine('hold %s' % (p,))
+ if p == '':
+ d.addCallback(self._parseHoldstatus)
+ return d
+
+ def _parsePid(self, result):
+ self.pid = int(result.split('=')[1])
+
+ def get_pid(self):
+ d = self._pushdef()
+ self.sendLine('pid')
+ d.addCallback(self._parsePid)
+ return d
+
+ def logOn(self):
+ d = self._pushdef()
+ self.sendLine('log on')
+ return d
+
+ def stateOn(self):
+ d = self._pushdef()
+ self.sendLine('state on')
+ return d
+
+ def _parseVersion(self, data):
+ version = data.split('\n')[0].split(':')[1]
+ self.openvpn_version = version.strip()
+
+ def getVersion(self):
+ d = self._pushdef()
+ self.sendLine('version')
+ d.addCallback(self._parseVersion)
+ return d
+
+ def getInfo(self):
+ state = self._statelog.values()[-1]
+ return {
+ 'remote': self.remote,
+ 'rport': self.rport,
+ 'state': state.state,
+ 'state_simple': state.simple,
+ 'state_legend': state.legend,
+ 'openvpn_version': self.openvpn_version,
+ 'pid': self.pid,
+ 'traffic_down_total': self.traffic.down,
+ 'traffic_up_total': self.traffic.up}
+
+
+class State(object):
+
+ """
+ Possible States in an OpenVPN connection, according to the
+ OpenVPN Management documentation.
+ """
+
+ CONNECTING = 'CONNECTING'
+ WAIT = 'WAIT'
+ AUTH = 'AUTH'
+ GET_CONFIG = 'GET_CONFIG'
+ ASSIGN_IP = 'ASSIGN_IP'
+ ADD_ROUTES = 'ADD_ROUTES'
+ CONNECTED = 'CONNECTED'
+ RECONNECTING = 'RECONNECTING'
+ EXITING = 'EXITING'
+
+ OFF = 'OFF'
+ ON = 'ON'
+ STARTING = 'STARTING'
+ STOPPING = 'STOPPING'
+ FAILED = 'FAILED'
+
+ _legend = {
+ 'CONNECTING': 'Connecting to remote server',
+ 'WAIT': 'Waiting from initial response from server',
+ 'AUTH': 'Authenticating with server',
+ 'GET_CONFIG': 'Downloading configuration options from server',
+ 'ASSIGN_IP': 'Assigning IP address to virtual network interface',
+ 'ADD_ROUTES': 'Adding routes to system',
+ 'CONNECTED': 'Initialization Sequence Completed',
+ 'RECONNECTING': 'A restart has occurred',
+ 'EXITING': 'A graceful exit is in progress'
+ }
+
+ _simple = {
+ 'CONNECTING': STARTING,
+ 'WAIT': STARTING,
+ 'AUTH': STARTING,
+ 'GET_CONFIG': STARTING,
+ 'ASSIGN_IP': STARTING,
+ 'ADD_ROUTES': STARTING,
+ 'CONNECTED': ON,
+ 'RECONNECTING': STARTING,
+ 'EXITING': STOPPING
+ }
+
+ def __init__(self, state, timestamp):
+ self.state = state
+ self.timestamp = timestamp
+
+ @classmethod
+ def get_legend(cls, state):
+ return cls._legend.get(state)
+
+ @classmethod
+ def get_simple(cls, state):
+ return cls._simple.get(state)
+
+ @property
+ def simple(self):
+ return self.get_simple(self.state)
+
+ @property
+ def legend(self):
+ return self.get_legend(self.state)
+
+ def __repr__(self):
+ return '<State: %s [%s]>' % (
+ self.state, time.ctime(int(self.timestamp)))
+
+
+class TrafficCounter(object):
+
+ CAPACITY = 60
+
+ def __init__(self):
+ self.down = None
+ self.up = None
+ self._buf = OrderedDict()
+
+ def update(self, down, up, ts):
+ i_down = int(down)
+ i_up = int(up)
+ self.down = i_down
+ self.up = i_up
+ if len(self._buf) > self.CAPACITY:
+ self._buf.pop(self._buf.keys()[0])
+ self._buf[ts] = i_down, i_up
+
+ def get_rate(self, human=True):
+ points = self._buf.items()
+ if len(points) < 2:
+ return ['NA', 'NA']
+ ts1, prev = points[-2]
+ ts2, last = points[-1]
+ rate_down = _get_rate(last[0], prev[0], ts2, ts1)
+ rate_up = _get_rate(last[1], prev[1], ts2, ts1)
+ rates = rate_down, rate_up
+ if human:
+ rates = map(bytes2human, rates)
+ return rates
+
+
+def _get_rate(p2, p1, ts2, ts1):
+ return ((1.0 * (p2 - p1)) / (ts2 - ts1))