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
|
import os
import re
import socket
import struct
import errno
##### Networking-related functions
def get_defaultroute():
fd = os.popen('/sbin/ip route list 2>/dev/null')
for line in fd.readlines():
m = re.search('^default via ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+) dev ([^ ]*)',
line)
if m:
return [m.group(1), m.group(2)]
return [None, None]
def get_current_ipaddr(dev='defaultroute'):
"""Get the primary IP address for the given network interface.
dev network interface (default: default route device)
returns interface address as a string
"""
if dev == 'defaultroute':
dev = get_defaultroute()[1]
if not dev:
return
fd = os.popen( '/sbin/ifconfig ' + dev + ' 2>/dev/null' )
for line in fd.readlines():
m = re.search( '^\s+inet addr:([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*',
line )
if m:
return m.group(1)
return None
def get_current_ipmask(dev='defaultroute'):
"""Get the primary IP netmask for a network interface.
dev network interface (default: default route device)
returns interface netmask as a string
"""
if dev == 'defaultroute':
dev = get_defaultroute()[1]
if not dev:
return
fd = os.popen( '/sbin/ifconfig ' + dev + ' 2>/dev/null' )
for line in fd.readlines():
m = re.search( '^.+Mask:([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*',
line )
if m:
return m.group(1)
return None
def get_current_ipgw(dev='defaultroute'):
"""Get the IP gateway for a network interface.
dev network interface (default: default route device)
returns gateway address as a string
"""
if dev == 'defaultroute':
return get_defaultroute()[0]
if not dev:
return
fd = os.popen( '/sbin/route -n' )
for line in fd.readlines():
m = re.search( '^\S+\s+([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)' +
'\s+\S+\s+\S*G.*' + dev + '.*', line )
if m:
return m.group(1)
return None
def inet_aton(addr):
"""Convert an IP addr in IPv4 dot notation into an int.
addr IP address as a string
returns integer
"""
b = socket.inet_aton(addr)
return struct.unpack('!I', b)[0]
def inet_ntoa(n):
"""Convert an int into an IP addr in IPv4 dot notation.
n IP address
returns string
"""
b = struct.pack('!I', n)
return socket.inet_ntoa(b)
def add_offset_to_ip(addr, offset):
"""Add a numerical offset to an IP addr in IPv4 dot notation.
addr IP address
offset offset to add
returns new address
"""
n = inet_aton(addr)
n += offset
return inet_ntoa(n)
def check_subnet( ip, network, netmask ):
"""Check if an IP address is in the subnet defined by
a network address and mask'.
ip IP adress
network network address
netmask network mask
returns 1 if it is in the subnet, 0 if not
"""
n_ip = inet_aton(ip)
n_net = inet_aton(network)
n_mask = inet_aton(netmask)
return (n_ip & n_mask) == (n_net & n_mask)
|
