-
Notifications
You must be signed in to change notification settings - Fork 2
/
lanscan.py
118 lines (95 loc) · 3.91 KB
/
lanscan.py
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
# MIT License
#
# Copyright (c) 2019 Weston Berg
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
'''
Module providing functionality for determining IP address connected to LAN
'''
from collections import deque
from concurrent.futures import ThreadPoolExecutor
import ipaddress
import netifaces
import socket
import subprocess
MAX_SCAN_WORKERS = 50 # Number of workers in pool
PING_CNT_ARG = '1' # How many echo requests to send
PING_TIMEOUT_MS_ARG = '750' # Timeout in ms
def __get_netmask(host_ip):
'''
Determines the netmask for the given host's IP address
:param host_ip: IP to determine netmask for
:returns: Netmask as formatted string (xxx.xxx.xxx.xxx)
'''
netmask = '' # Netmask for given adapter IP
# Get list of network adapters
net_adapters = netifaces.interfaces()
# Search through list for appropriate adapter
for adapter in net_adapters:
# Get adapter info
adapter_info = netifaces.ifaddresses(adapter)
# Filter to only AF_INET address family (list of dicts of addresses)
af_inet_addresses = adapter_info[netifaces.AF_INET]
# Check addresses for host IP
for addr_dict in af_inet_addresses:
if addr_dict['addr'] == host_ip:
# Match found, retrieve netmask
netmask = addr_dict['netmask']
return netmask
def __ping_check(ip, queue):
'''
Pings given IP address and writes IP into queue if ping successful
:param ip: IP to ping
:param queue: Deque holding active IP addresses
'''
# Ping IP
ping_args = ['ping', '-n', PING_CNT_ARG, '-w', PING_TIMEOUT_MS_ARG, ip]
res = subprocess.run(ping_args,
stdout=subprocess.DEVNULL,
stderr=subprocess.STDOUT)
if res.returncode == 0:
# IP active so add to queue
queue.append(ip)
def execute():
'''
Runs the scan of the LAN
:returns: List of active IP addresses in subnet
'''
# Deque of active IP addresses
ip_queue = deque()
# Get localhosts IP address
host_ip_str = socket.gethostbyname(socket.gethostname())
# Get netmask for localhost
netmask = __get_netmask(host_ip_str)
if len(netmask.strip()) == 0:
raise RuntimeError('Unable to determine netmask.')
# Construct network localhost lives on
net = ipaddress.ip_network(host_ip_str + '/' + netmask, strict=False)
# Check for active IP addresses
host_ip_addr = ipaddress.ip_address(host_ip_str)
with ThreadPoolExecutor(max_workers=MAX_SCAN_WORKERS) as executor:
# Scan all available host IPs on subnet
for net_host_addr in net.hosts():
# Skip localhost
if net_host_addr != host_ip_addr:
# Schedule active check
executor.submit(__ping_check,
str(net_host_addr),
ip_queue)
return list(ip_queue)