Python/Scanner - Revision history

Unknown user at 20:10, 11 May 2025

2025-05-11T20:10:13Z

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Unknown user at 20:04, 11 May 2025

2025-05-11T20:04:35Z

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Admin: /* Libraries */

2017-08-14T08:35:59Z

Libraries

← Older revision		Revision as of 08:35, 14 August 2017
Line 40:		Line 40:
	</pre>		</pre>

	~~TBC...~~		Next, a function to send UDP packets out on port 65212 using the socket library is defined:

	~~{{Scrollbox\|~~

	<pre>		<pre>
Line 53:		Line 51:
	except:		except:
	pass		pass
			</pre>

			So far so good Now the port scanner defines a few classes, namely, an IP class that basically just wraps a bunch of constants and data:

			<pre>
	class IP(Structure):		class IP(Structure):
	_fields_ = [		_fields_ = [
Line 88:		Line 90:
	except:		except:
	self.protocol = str(self.protocol_num)		self.protocol = str(self.protocol_num)
			</pre>

			Next comes an ICMP class:

			<pre>
	class ICMP(Structure):		class ICMP(Structure):

Line 104:		Line 110:
	def __init__(self, socket_buffer):		def __init__(self, socket_buffer):
	pass		pass
			</pre>

			Okay, so now we get to the good part.

			<pre>
	# create a raw socket and bind it to the public interface		# create a raw socket and bind it to the public interface
	if os.name == "nt":		if os.name == "nt":
Line 114:		Line 124:

	sniffer.bind((host, 0))		sniffer.bind((host, 0))
			</pre>

			Here we've created an open socket, and bound it to the host IP. That's the socket through which our machine will talk to and listen to the outside world.

			<pre>
	# we want the IP headers included in the capture		# we want the IP headers included in the capture
	sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)		sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
Line 126:		Line 140:
	t = threading.Thread(target=udp_sender,args=(subnet,magic_message))		t = threading.Thread(target=udp_sender,args=(subnet,magic_message))
	t.start()		t.start()
			</pre>

			This just starts up a thread that is sending UDP packets with our "magic message".

			<pre>
	try:		try:
	while True:		while True:
Line 169:		Line 187:

	</pre>		</pre>

	}}

	=Original Code=		=Original Code=

Admin: /* Flags */

2017-04-16T20:25:18Z

Flags

← Older revision		Revision as of 20:25, 16 April 2017
Line 330:		Line 330:
	=Flags=		=Flags=

	~~[[Category:Python]]~~		{{PythonFlag}}

	{{LinuxNetworkingFlag}}		{{LinuxNetworkingFlag}}

Admin at 02:24, 24 July 2016

2016-07-24T02:24:04Z

← Older revision		Revision as of 02:24, 24 July 2016
Line 18:		Line 18:
	import struct		import struct
	import threading		import threading

			from netaddr import IPNetwork,IPAddress
			from ctypes import *
	</pre>		</pre>

	~~Using the~~ socket ~~library~~ to ~~make connections within the computer to various interfaces~~.		socket - a socket is what two processes use to communicate with each other or with a device. https://docs.python.org/2/library/socket.html

	~~Using the built-in os library, of course, to do operating system things~~.

	~~Struct~~ library ~~- not sure exactly~~.

	~~Threading library allows running~~ multiple ~~simultaneous tasks, for~~ things ~~that can easily be parallelized, like scans of ports~~.		threading - high level interface for threading, or, doing multiple things at once. https://docs.python.org/2/library/threading.html

	~~<pre>~~		struct - https://docs.python.org/2/library/struct.html
	~~from netaddr import IPNetwork,IPAddress~~
	from ctypes import *
	</~~pre>~~

	netaddr - ?		netaddr - "A Python library for representing and manipulating network addresses." https://pythonhosted.org/netaddr/

	ctypes - ~~allows using C language types directly from Python (?)~~		ctypes - https://docs.python.org/2/library/ctypes.html

	Next we set the host machine IP address, and the subnet that is being scanned:		Next we set the host machine IP address, and the subnet that is being scanned:

Admin: /* Flags */

2016-07-24T02:21:28Z

Flags

← Older revision		Revision as of 02:21, 24 July 2016
Line 336:		Line 336:
	[[Category:Python]]		[[Category:Python]]

	{{~~NmapFlag~~}}		{{LinuxNetworkingFlag}}

Admin at 02:19, 24 July 2016

2016-07-24T02:19:19Z

← Older revision		Revision as of 02:19, 24 July 2016
Line 331:		Line 331:

	</pre>		</pre>

			=Flags=

			[[Category:Python]]

			{{NmapFlag}}

Admin: /* Code */

2016-07-24T02:09:54Z

Code

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Admin: Created page with "=Source= Github repo: https://github.com/jerry-0824/008_black_hat_python/ File: https://github.com/jerry-0824/008_black_hat_python/blob/master/p44_chapter_03_scanner.py =Co..."

2016-07-24T02:06:20Z

Created page with "=Source= Github repo: https://github.com/jerry-0824/008_black_hat_python/ File: https://github.com/jerry-0824/008_black_hat_python/blob/master/p44_chapter_03_scanner.py =Co..."

New page

=Source=

Github repo: https://github.com/jerry-0824/008_black_hat_python/

File: https://github.com/jerry-0824/008_black_hat_python/blob/master/p44_chapter_03_scanner.py

=Code=

<pre>
# /usr/bin/python python3
# -*- coding:utf-8 -*-
##################################################
# Filename: p43_chapter_03_scanner.py
# Author: jerry_0824
# Email: 63935127##qq.com
# Phone: +86-155-8287-7999
# Date: 2016-03-07
# Version: v1.0.0
##################################################

import socket
import os
import struct
import threading

from netaddr import IPNetwork,IPAddress
from ctypes import *

# host to listen on
host = "192.168.1.140"

# subnet to target
subnet = "192.168.1.0/24"

# magic we'll check ICMP responses for
magic_message = "PYTHONRULES!"

def udp_sender(subnet,magic_message):
sender = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

for ip in IPNetwork(subnet):
try:
sender.sendto(magic_message,("%s" % ip,65212))
except:
pass

class IP(Structure):
_fields_ = [
("ihl", c_ubyte, 4),
("version", c_ubyte, 4),
("tos", c_ubyte),
("len", c_ushort),
("id", c_ushort),
("offset", c_ushort),
("ttl", c_ubyte),
("protocol_num", c_ubyte),
("sum", c_ushort),
# ("src", c_ulong),
# ("dst", c_ulong)
("src", c_uint32),
("dst", c_uint32)
]

def __new__(self, socket_buffer=None):
return self.from_buffer_copy(socket_buffer)

def __init__(self, socket_buffer=None):

# map protocol constants to their names
self.protocol_map = {1:"ICMP", 6:"TCP", 17:"UDP"}

# human readable IP addresses
self.src_address = socket.inet_ntoa(struct.pack("<L",self.src))
self.dst_address = socket.inet_ntoa(struct.pack("<L",self.dst))

# human readable protocol
try:
self.protocol = self.protocol_map[self.protocol_num]
except:
self.protocol = str(self.protocol_num)

class ICMP(Structure):

_fields_ = [
("type", c_ubyte),
("code", c_ubyte),
("checksum", c_ushort),
("unused", c_ushort),
("next_hop_mtu", c_ushort)
]

def __new__(self, socket_buffer):
return self.from_buffer_copy(socket_buffer)

def __init__(self, socket_buffer):
pass

# create a raw socket and bind it to the public interface
if os.name == "nt":
socket_protocol = socket.IPPROTO_IP
else:
socket_protocol = socket.IPPROTO_ICMP

sniffer = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket_protocol)

sniffer.bind((host, 0))

# we want the IP headers included in the capture
sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)

# if we're on Windows we need to send some ioctls
# to setup promiscuous mode
if os.name == "nt":
sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_ON)

# start sending packets
t = threading.Thread(target=udp_sender,args=(subnet,magic_message))
t.start()

try:
while True:

# read in a single packet
raw_buffer = sniffer.recvfrom(65535)[0]

# create an IP header from the first 20 bytes of the buffer
ip_header = IP(raw_buffer[0:20])

#print "Protocol: %s %s -> %s" % (ip_header.protocol, ip_header.src_address, ip_header.dst_address)

# if it's ICMP we want it
if ip_header.protocol == "ICMP":

# calculate where our ICMP packet starts
offset = ip_header.ihl * 4
buf = raw_buffer[offset:offset + sizeof(ICMP)]

# create our ICMP structure
icmp_header = ICMP(buf)

#print "ICMP -> Type: %d Code: %d" % (icmp_header.type, icmp_header.code)

# now check for the TYPE 3 and CODE 3 which indicates
# a host is up but no port available to talk to
if icmp_header.code == 3 and icmp_header.type == 3:

# check to make sure we are receiving the response
# that lands in our subnet
if IPAddress(ip_header.src_address) in IPNetwork(subnet):

# test for our magic message
if raw_buffer[len(raw_buffer)-len(magic_message):] == magic_message:
print("Host Up: %s" % ip_header.src_address)

# handle CTRL-C
except KeyboardInterrupt:
# if we're on Windows turn off promiscuous mode
if os.name == "nt":
sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_OFF)

</pre>