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portscan.py
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portscan.py
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# 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 scanning host for open TCP ports
'''
from collections import deque
from concurrent.futures import ThreadPoolExecutor
import socket
PORT_SCAN_MAX_WORKERS = 1000 # How many workers can spawn for port scanning
ADDR_FAMILY = socket.AF_INET # Addresses represented by tuple (host, port)
SOCK_TYPE = socket.SOCK_STREAM # 'TCP' sockets
def __scan(queue, host, port):
'''
Helper function for scanning a port and placing result in queue
'''
# Attempt connection
with socket.socket(ADDR_FAMILY, SOCK_TYPE) as sock:
try:
sock.connect((host, port))
queue.append(port) # If we make it here, connection successful
except Exception:
pass
def execute(host, lower_scan_range, upper_scan_range):
'''
Conducts a port scan of the provided host
:param host: Host name or IP of host to conduct port scan.
IP shall be formatted 'xxx.xxx.xxx.xxx'.
:param lower_scan_range: Port to begin scan at
:param upper_scan_range: Port to end scan at
:returns: List of open ports on provided host
'''
open_ports = deque() # Deque holding discovered open ports
# Check whether hostname or IP and whether it exists
try:
if any(c.isalpha() for c in host):
socket.gethostbyname(host)
else:
# TODO check for correct IP formatting
socket.gethostbyaddr(host)
except (socket.gaierror, socket.herror):
raise ValueError('%s host does not exist' % (host))
with ThreadPoolExecutor(max_workers=PORT_SCAN_MAX_WORKERS) as executor:
# Schedule scans with thread pool
for port in range(lower_scan_range, (upper_scan_range + 1)):
executor.submit(__scan, open_ports, host, port)
return list(open_ports)