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vpnocchio.py
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vpnocchio.py
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# -*- coding: utf-8 -*-
import errno
import fcntl
import logging
import os
import random
import re
import socket
import stat
import struct
import subprocess
import sys
import tempfile
import time
import pexpect
import ptyprocess
import requests
import requests_toolbelt
from user_agent import generate_user_agent
__version__ = '0.0.24'
__author__ = 'Oleksii Ivanchuk (barjomet@barjomet.com)'
logging.getLogger("requests").setLevel(logging.WARNING)
ROUTE_UP_SCRIPT = """#!/bin/sh
table_id=2`echo $dev | cut -c 4-24`
ip route add default via $route_vpn_gateway dev $dev table $table_id
ip rule add from $ifconfig_local table $table_id
ip rule add to $route_vpn_gateway table $table_id
ip route flush cache
exit 0"""
class VPN:
auth_user_pass = None
conf_dir = '/etc/openvpn'
conf_file = None
conf_files = None
conf_match = '\.ovpn'
conf_exclude = 'Virtual'
connected = False
connected_at = 0
connect_timeout = 60
instances = []
interface = None
interface_addr = None
ip = None
ip_services = [
'http://ipinfo.io/ip',
'http://ident.me/',
'http://ip.barjomet.com',
'http://icanhazip.com',
'http://checkip.amazonaws.com/'
]
log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())
management_unix_socket = None
mssfix = None
min_time_before_reconnect = 30
one_connection_per_conf = True
req_timeout = 3
route_up_script = None
timeout = 30
tun_mtu = None
vpn_process = None
witch_mtu_regex = re.compile('MTU\s+=\s(.*)')
witch_openvpn_regex = re.compile('(.*(?:OpenVPN detected|'
'Probably OpenVPN)[^<^\n]*)')
use_pexpect = False
use_sudo = True
def __init__(self, username=None,
password=None,
conf_match=None,
conf_exclude = None,
default_route=False,
mssfix=None,
tun_mtu=None,
timeout=None,
id=None,
useragent=None,
conf_file_list = None):
if id != None: self.id = id
else: self.id = self._get_id()
self.default_route = default_route
if mssfix: self.mssfix = mssfix
if tun_mtu: self.tun_mtu = tun_mtu
if timeout: self.timeout = timeout
self._init_logging()
self.username = username
self.password = password
self.useragent = useragent
if conf_exclude : self.conf_exclude = conf_exclude
if conf_file_list:
self.conf_files = conf_file_list
else:
self._get_conf_files(conf_match or self.conf_match)
self.connect()
def __repr__(self):
return ("<VPNocchio id:%s conf:%s ip:%s>"
% (self.id, self.conf_file, self.ip))
@staticmethod
def killall():
if subprocess.call(['sudo', 'killall', 'openvpn']) == 0:
return True
else:
return False
@property
def _is_running(self):
try:
os.kill(self.vpn_process.pid, 0)
except OSError as err:
if err.errno == errno.ESRCH:
return False
elif err.errno == errno.EPERM:
return True
else:
return True
@property
def cmd(self):
return ' '.join(self.cmd_list)
@property
def cmd_list(self):
self.management_unix_socket = tempfile.mkstemp()[1]
return [str(i) for i in
(['sudo'] if self.use_sudo else []) +\
['openvpn', '--config', self.conf_file] +\
(['--auth-user-pass', self.auth_user_pass]
if self.auth_user_pass else []) +\
(['--tun-mtu', self.tun_mtu] if self.tun_mtu else []) +\
(['--mssfix', self.mssfix] if self.mssfix else []) +\
(['--route-noexec',
'--script-security', '2',
'--route-up', self.route_up_script]
if not self.default_route else []) +\
['--management', self.management_unix_socket, 'unix']]
def _connect_method(self):
if self.use_pexpect:
return self._connect_pexepect()
else:
return self._connect_subprocess()
def _connect_pexepect(self):
self.vpn_process = pexpect.spawn(self.cmd,
cwd=self.conf_dir,
timeout=self.connect_timeout)
try:
if self.username and self.password:
self.vpn_process.expect('Enter Auth Username:')
self.vpn_process.sendline(self.username)
self.vpn_process.expect('Enter Auth Password:')
self.vpn_process.sendline(self.password)
self.vpn_process.expect('.* TUN/TAP device (.*) opened')
self.interface = self.vpn_process.match.group(1)
self.vpn_process.expect('Initialization Sequence Completed')
return True
except pexpect.EOF:
self.log.debug(self.vpn_process.before)
self.log.error('Connection refused.')
except pexpect.TIMEOUT:
try:
self.log.debug(self.vpn_process.before)
except AttributeError:
pass
self.log.error('Connection failed! Time is out.')
self.disconnect()
return False
def _connect_subprocess(self):
error_regex = re.compile('error', re.IGNORECASE)
interface_regex = re.compile('.* TUN/TAP device (.*) opened')
success_regex = re.compile('Initialization Sequence Completed')
self._create_auth_file()
self.vpn_process = subprocess.Popen(self.cmd_list,
cwd=self.conf_dir,
stdout=subprocess.PIPE,
universal_newlines=True)
vpn_launched = time.time()
try:
while True:
if time.time() - vpn_launched > self.connect_timeout:
self.log.error('Connection failed! Time is out.')
self.disconnect()
return False
stdout = self.vpn_process.stdout.readline()
interface_match = interface_regex.match(stdout)
if interface_match:
self.interface = interface_match.group(1)
if error_regex.search(stdout):
self.log.error('OpenVPN: %s', stdout)
if success_regex.search(stdout):
return True
time.sleep(.1)
except ValueError as e:
self.log.debug('Connection failed.')
self.disconnect()
return False
finally:
self._delete_auth_file()
def _create_auth_file(self):
with tempfile.NamedTemporaryFile('w', delete=False) as _file:
self.auth_user_pass = _file.name
_file.write("%s\n%s" % (self.username, self.password))
def _create_route_up_script(self):
with tempfile.NamedTemporaryFile('w', delete=False) as _file:
self.route_up_script = _file.name
_file.write(ROUTE_UP_SCRIPT)
st = os.stat(self.route_up_script)
os.chmod(self.route_up_script, st.st_mode |\
stat.S_IXUSR |\
stat.S_IXGRP |\
stat.S_IXOTH)
def _delete_auth_file(self):
os.remove(self.auth_user_pass)
self.auth_user_pass = None
def _delete_route_up_script(self):
os.remove(self.route_up_script)
self.route_up_script = None
def _get_id(self):
ids = [one.id for one in self.__class__.instances]
new_possible_id = len(ids)
for who in range(new_possible_id-1):
if who != ids[who]:
return who
return new_possible_id
def _get_conf_files(self, match=''):
filename_regex = re.compile(match, re.IGNORECASE)
self.conf_files = [f for f in os.listdir(self.conf_dir)
if os.path.isfile(os.path.join(self.conf_dir, f))
and filename_regex.search(f)]
if self.conf_exclude:
self.conf_files = [f for f in self.conf_files
if not self.conf_exclude in f]
return self.conf_files
def _get_interface_addr(self):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.interface_addr = socket.inet_ntoa(fcntl.ioctl(
s.fileno(),
0x8915,
struct.pack('256s',
self.interface[:15])
)[20:24])
s.close()
def _init_logging(self):
self.log = logging.getLogger('%s_%s' % (__name__, self.id))
self.log.addHandler(logging.NullHandler())
def _init_requests(self):
self.session = requests.Session()
self.session.headers.update({
'user-agent' : self.useragent or generate_user_agent()})
source = requests_toolbelt.adapters.source\
.SourceAddressAdapter(self.interface_addr)
self.session.mount('http://', source)
self.session.mount('https://', source)
def _kill(self):
try:
if self.use_sudo:
subprocess.call(['sudo', 'kill', str(self.vpn_process.pid)])
else:
os.kill(self.vpn_process.pid, 9)
except Exception as e:
self.log.warning('Unable to kill openvpn: %r', e)
def _select_conf_file(self):
if not self.conf_files:
self.log.error("There's no config files found dir:%s, pattern:%s",
self.conf_dir, self.conf_match)
return False
if self.one_connection_per_conf:
conf_files = [f for f in self.conf_files
if f not in [i.conf_file for i in self.instances]]
if not conf_files:
self.log.error("There's no available vpn servers left")
return False
else:
conf_files = self.conf_files
self.conf_file = random.choice(conf_files)
return True
def _terminate(self):
try:
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.connect(self.management_unix_socket)
sock.send('signal SIGTERM\r\n')
sock.recv(1)
except Exception as e:
self.log.warning('Failed to terminate OpenVPN process: %r', e)
def check_ip(self):
for attempt in range(len(self.ip_services)):
try:
self.ip = self.get(self.ip_services[0],
timeout=self.req_timeout).text.rstrip()
self.log.debug('External IP:%s', self.ip)
return self.ip
except:
self.ip_services.append(self.ip_services.pop(0))
def check_witch(self):
r = self.get('http://witch.valdikss.org.ru/', timeout=self.timeout)
try:
mtu = self.witch_mtu_regex.search(r.text).group(1)
message = self.witch_openvpn_regex.search(r.text).group(1)
is_openvpn_detected = False if u'No OpenVPN detected' \
in message \
else True
return dict(mtu=mtu, detected=is_openvpn_detected, msg=message)
except AttributeError:
self.log.warning('Failed to parse W I T C H response')
def connect(self):
if self.connected: self.disconnect()
if not self.default_route: self._create_route_up_script()
while not self.connected and self._select_conf_file():
self.log.info('Connecting using config:%s', self.conf_file)
if self._connect_method():
self.log.info('Connected')
self.log.debug('Interface: %s', self.interface)
self._get_interface_addr()
self.log.debug('Interface addr: %s', self.interface_addr)
self.connected = True
self.connected_at = time.time()
if not self.default_route: self._delete_route_up_script()
self.instances.insert(self.id, self)
self._init_requests()
self.check_ip()
def get(self, *args, **kwargs):
return self.session.get(*args, **kwargs)
def disconnect(self):
if self.vpn_process is not None:
try:
self._terminate()
except ValueError:
self._kill()
time.sleep(0.5)
while self._is_running:
if self.use_pexpect:
try:
self.vpn_process.close(True)
except ptyprocess.ptyprocess.PtyProcessError:
pass
else:
self.vpn_process.wait()
time.sleep(0.1)
self.connected = False
try:
self.instances.remove(self)
except ValueError:
pass
self.vpn_process = self.ip = self.conf_file = None
self.log.info('Disconnected')
else:
self.log.warning('Not connected')
def new_ip(self):
self.disconnect()
if self.min_time_before_reconnect:
seconds_since_last_connect = time.time() - self.connected_at
if seconds_since_last_connect < self.min_time_before_reconnect:
seconds_to_wait = self.min_time_before_reconnect \
- seconds_since_last_connect
self.log.warning("We'll wait %3.1f seconds before reconnect",
seconds_to_wait)
time.sleep(seconds_to_wait)
self.connect()
def post(self, *args, **kwargs):
return self.session.post(*args, **kwargs)
def init_logging(level=logging.DEBUG):
root = logging.getLogger()
root.setLevel(level)
consolehandler = logging.StreamHandler(sys.stdout)
consolehandler.setLevel(level)
formatter = logging.Formatter('%(asctime)s [%(levelname)s] [%(name)s] %(message)s', '%Y-%m-%d %H:%M:%S')
consolehandler.setFormatter(formatter)
root.addHandler(consolehandler)