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icmphostdiscovery.py
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icmphostdiscovery.py
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import ipaddress
import socket
import struct
import sys
import multiprocessing
import string
import random
Sending_pings = True
class IP:
def __init__(self, buff=None):
header = struct.unpack('<BBHHHBBH4s4s', buff)
#shifts the first 4 bits to right -->
self.ver = header[0] >> 4
#ip header len 1 bytes AND 0xF (00001111) --> second half of the first byte
self.ihl = header[0] & 0xF
self.tos = header[1]
self.len = header[2]
self.id = header[3]
self.offset = header[4]
self.ttl = header[5]
self.protocol_num = header[6]
self.sum = header[7]
self.src = header[8]
self.dst = header[9]
# conver ips to decimal
self.src_address = ipaddress.ip_address(self.src)
self.dst_address = ipaddress.ip_address(self.dst)
# map protocol constants to their names
# https://en.wikipedia.org/wiki/List_of_IP_protocol_numbers
self.protocol_map = {1: "ICMP", 6: "TCP", 17: "UDP"}
try:
self.protocol =self.protocol_map[self.protocol_num]
except Exception as e:
print('%s No protocol for %s' % (e,self.protocol_num))
self.protocol = str(self.protocol_num)
class ICMP:
def __init__(self,buff = None) :
rawshit = struct.unpack('<BBHHH',buff)
self.type = rawshit[0]
self.code = rawshit[1]
self.headerchecksum = rawshit[2]
self.unused = rawshit[3]
self.nexthopMTU = rawshit[4]
def generate_random_hex_string(length=7):
hex_characters = string.hexdigits[:-6]
random_hex_string = ''.join(random.choice(hex_characters) for _ in range(length))
return random_hex_string
def listen(secret:str):
global Sending_pings
sniffer = socket.socket(socket.AF_INET,socket.SOCK_DGRAM,socket.IPPROTO_ICMP)
my_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
my_socket.connect(("8.8.8.8", 80))
my_ip = my_socket.getsockname()[0]
sniffer.bind((my_ip,2500))
sniffer.settimeout(5)
while Sending_pings:
try:
raw_buffer = sniffer.recvfrom(65535)[0]
ip_header = IP(raw_buffer[0:20])
data = raw_buffer[64:]
if data.decode('utf-8') == secret:
print(f'{ip_header.src_address} replied to your ping')
except TimeoutError:
print('Done')
break
def sendping(ip,mask,secret):
global Sending_pings
my_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
my_socket.connect(("8.8.8.8", 2500))
my_ip = my_socket.getsockname()[0]
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.bind((my_ip,2500))
icmp_type = 8
icmp_code = 0
icmp_checksum = 0
icmp_identifier = 0
icmp_sequence = 0
rawicmp = struct.pack('BBHHH',icmp_type,icmp_code,icmp_checksum,icmp_identifier,icmp_sequence)
rawicmpwithscrt = rawicmp + bytes(secret,'utf8')
nettoscan = f'{ip}/{mask}'
for gotip in ipaddress.IPv4Network(nettoscan).hosts():
try:
s.sendto(rawicmpwithscrt,(str(gotip),2500))
except OSError as e:
print(e)
print('--- All packets sent ---')
Sending_pings = False
if __name__ == '__main__':
if len(sys.argv) == 3:
host = sys.argv[1]
mask = sys.argv[2]
elif len(sys.argv) == 2:
host = sys.argv[1]
else:
host = '192.168.1.0'
mask = '24'
secret = generate_random_hex_string()
listener = multiprocessing.Process(target=listen,args=(secret,))
sender = multiprocessing.Process(target=sendping,args=(host,mask,secret))
try:
listener.start()
sender.start()
sender.join()
listener.join()
except KeyboardInterrupt:
#listener.terminate()
sender.terminate()