1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
# -*- coding: utf-8 -*-
import logging
import platform
import socket
import netifaces
import ping
import requests
from leap.base import constants
from leap.base import exceptions
logger = logging.getLogger(name=__name__)
#EVENTS OF NOTE
EVENT_CONNECT_REFUSED = "[ECONNREFUSED]: Connection refused (code=111)"
class LeapNetworkChecker(object):
"""
all network related checks
"""
def __init__(self, *args, **kwargs):
provider_gw = kwargs.pop('provider_gw', None)
self.provider_gateway = provider_gw
def run_all(self, checker=None):
if not checker:
checker = self
#self.error = None # ?
# for MVS
checker.check_tunnel_default_interface()
checker.check_internet_connection()
checker.is_internet_up()
if self.provider_gateway:
checker.ping_gateway(self.provider_gateway)
checker.parse_log_and_react([], ())
def check_internet_connection(self):
try:
# XXX remove this hardcoded random ip
# ping leap.se or eip provider instead...?
requests.get('http://216.172.161.165')
except requests.ConnectionError as e:
error = "Unidentified Connection Error"
if e.message == "[Errno 113] No route to host":
if not self.is_internet_up():
error = "No valid internet connection found."
else:
error = "Provider server appears to be down."
logger.error(error)
raise exceptions.NoInternetConnection(error)
except (requests.HTTPError, requests.RequestException) as e:
raise exceptions.NoInternetConnection(e.message)
logger.debug('Network appears to be up.')
def is_internet_up(self):
iface, gateway = self.get_default_interface_gateway()
try:
self.ping_gateway(self.provider_gateway)
except exceptions.NoConnectionToGateway:
return False
return True
def check_tunnel_default_interface(self):
"""
Raises an TunnelNotDefaultRouteError
(including when no routes are present)
"""
if not platform.system() == "Linux":
raise NotImplementedError
# XXX GET DARWIN IMPLEMENTATION
f = open("/proc/net/route")
route_table = f.readlines()
f.close()
#toss out header
route_table.pop(0)
if not route_table:
raise exceptions.TunnelNotDefaultRouteError()
line = route_table.pop(0)
iface, destination = line.split('\t')[0:2]
if not destination == '00000000' or not iface == 'tun0':
raise exceptions.TunnelNotDefaultRouteError()
def get_default_interface_gateway(self):
"""only impletemented for linux so far."""
if not platform.system() == "Linux":
raise NotImplementedError
# XXX use psutil
f = open("/proc/net/route")
route_table = f.readlines()
f.close()
#toss out header
route_table.pop(0)
default_iface = None
gateway = None
while route_table:
line = route_table.pop(0)
iface, destination, gateway = line.split('\t')[0:3]
if destination == '00000000':
default_iface = iface
break
if not default_iface:
raise exceptions.NoDefaultInterfaceFoundError
if default_iface not in netifaces.interfaces():
raise exceptions.InterfaceNotFoundError
return default_iface, gateway
def ping_gateway(self, gateway):
# TODO: Discuss how much packet loss (%) is acceptable.
# XXX -- validate gateway
# -- is it a valid ip? (there's something in util)
# -- is it a domain?
# -- can we resolve? -- raise NoDNSError if not.
# XXX -- needs review!
# We cannout use this ping implementation; it needs root.
# We need to look for another, poors-man implementation
# or wrap around system traceroute (using sh module, fi)
# -- kali
packet_loss = ping.quiet_ping(gateway)[0]
if packet_loss > constants.MAX_ICMP_PACKET_LOSS:
raise exceptions.NoConnectionToGateway
def check_name_resolution(self, domain_name):
try:
socket.gethostbyname(domain_name)
return True
except socket.gaierror:
raise exceptions.CannotResolveDomainError
def parse_log_and_react(self, log, error_matrix=None):
"""
compares the recent openvpn status log to
strings passed in and executes the callbacks passed in.
@param log: openvpn log
@type log: list of strings
@param error_matrix: tuples of strings and tuples of callbacks
@type error_matrix: tuples strings and call backs
"""
for line in log:
for each in error_matrix:
error, callbacks = each
if error in line:
for cb in callbacks:
cb()
|
