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dhcpeyes.py
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dhcpeyes.py
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#!/usr/bin/env python2.7
## Coded by vincenzogianfelice <developer.vincenzog@gmail.com> with <3
import base64
import sys
import time
import os
from termcolor import colored
from scapy.all import Ether, DHCP, IP, sniff
if (os.name == 'nt'):
import colorama
colorama.init()
# Variabili costanti
VERSION = 'v1.2'
# DHCP Message Type - RFC2132/Page-4 (https://tools.ietf.org/html/rfc2132#page-4) ##
# Per il momento, non verranno utilizzate tutti i "tipi", dato che il client, una volta stabilito il server di destinazione DHCP,
# invia direttamente i pacchetti a quest'ultimo (e non in broadcast), rendendo inefficace l intercettazione
# in modo passivo.
# Presto verra' aggiunta la possibilita' di intercettare le richieste/risposte tra il client/server (MITM)
# Stay Tuned! ;)
DHCPDISCOVER = 1 # Used
DHCPOFFER = 2 # No
DHCPREQUEST = 3 # Used
DHCPDECLINE = 4 # No
DHCPACK = 5 # No
DHCPNAK = 6 # Used
DHCPRELEASE = 7 # No
DHCPINFORM = 8 # Used
# DHCPOptions of Scapy
# (https://github.com/secdev/scapy/blob/master/scapy/layers/dhcp.py)
# `at line 112`. Actual version of scapy is 2.4.4.
MESSAGE_DHCP = 'message-type'
ERROR_MESSAGE = 'error_message'
REQUEST_ADDRESS = 'requested_addr'
ADDRESS_SERVER_DHCP = 'server_id'
VENDOR = 'vendor_class_id'
HOSTNAME = 'hostname'
# Variabili globali per lo script
REQUESTED = list() # Dispositivi totali connessi alla rete (tramite DHCP)
TOT_DEVICES = list() # Dispositivi totali catturati
def logo():
LOGO = 'ICAgIF9fX18gIF9fICBfX19fX19fX19fX18gIF9fX19fXyAgICAgICAgICAgICAgIAogICAvIF9fIFwvIC8gLyAvIF9fX18vIF9fIFwvIF9fX18vXyAgX19fX18gIF9fX19fCiAgLyAvIC8gLyAvXy8gLyAvICAgLyAvXy8gLyBfXy8gLyAvIC8gLyBfIFwvIF9fXy8KIC8gL18vIC8gX18gIC8gL19fXy8gX19fXy8gL19fXy8gL18vIC8gIF9fKF9fICApIAovX19fX18vXy8gL18vXF9fX18vXy8gICAvX19fX18vXF9fLCAvXF9fXy9fX19fLyAgCiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgIC9fX19fLyAgICAgICAgICAgICAK'
print(base64.b64decode(LOGO).decode('ascii'))
print('\t* Passive DHCP Listener! ('+VERSION+') *')
print('')
def help():
print('Usage: {} -i <interface>'.format(sys.argv[0]))
print('')
print(' -i Interface for listening')
print('Optional:')
print(' -o <arg> File Output Save')
print(' -t <arg> Options types: DHCPD (discover)')
print(' DHCPR (request)')
print(' DHCPN (nak)')
print(' DHCPI (inform)')
print(' Default print all options')
if (os.name == 'nt'):
print('')
print('')
print('(PS). In Windows, digit "netsh interface show interface" for show the names of interfaces')
def dhcp_options_search(pkts):
data = [pkts.getlayer(DHCP).options[0][1]]
for ex in pkts.getlayer(DHCP).options:
if REQUEST_ADDRESS in ex:
data.append((REQUEST_ADDRESS, ex[1]))
elif ADDRESS_SERVER_DHCP in ex:
data.append((ADDRESS_SERVER_DHCP, ex[1]))
elif VENDOR in ex:
data.append((VENDOR, ex[1]))
elif HOSTNAME in ex:
data.append((HOSTNAME, ex[1]))
elif ERROR_MESSAGE in ex:
data.append((ERROR_MESSAGE, ex[1]))
return data
def parser_packet(pkts):
if (not pkts):
return
mac_addr = pkts.getlayer(Ether).src
ip_src = pkts.getlayer(IP).src
ip_dst = pkts.getlayer(IP).dst
address = '???'
vendor = '???'
address_server_dhcp = '???'
hostname = '???'
error_msg = '???'
data = dhcp_options_search(pkts)
if (not data):
return
TOT_DEVICES.append(mac_addr)
type_option = data[0]
del data[0]
time_capture = tuple(time.localtime())
# Check in base al valore dell'opzione '-t' e/o dal tipo di pacchetto
# in entrata
if type_option == DHCPDISCOVER and ('DHCPD' in type_dhcp or not type_dhcp):
option_dhcp = 'DHCPDISCOVER'
format_syntax = '[%s] %s (%s (%s)) %s: %s'
value_syntax = '(time.strftime("%d/%m/%y %H:%M",time_capture), option_dhcp, mac_addr, vendor, colored(\'host\', \'yellow\', attrs=[\'bold\']), hostname)'
elif type_option == DHCPREQUEST and ('DHCPR' in type_dhcp or not type_dhcp):
REQUESTED.append(mac_addr)
option_dhcp = colored('DHCPREQUEST', 'white', attrs=['bold'])
format_syntax = '[%s] %s (%s) CLIENT -> [%s (%s)] %s: %s %s: %s'
value_syntax = '(time.strftime("%d/%m/%y %H:%M",time_capture), option_dhcp, colored(address_server_dhcp, \'blue\', attrs=[\'bold\']), mac_addr, vendor, colored(\'addr\', \'yellow\', attrs=[\'bold\']), address, colored(\'host\', \'yellow\', attrs=[\'bold\']), hostname)'
elif type_option == DHCPNAK and ('DHCPN' in type_dhcp or not type_dhcp):
option_dhcp = 'DHCPNAK'
format_syntax = '[%s] %s (%s from %s) (%s) via %s'
value_syntax = '(time.strftime("%d/%m/%y %H:%M",time_capture), colored(option_dhcp, \'red\', attrs=[\'bold\']), mac_addr, colored(ip_src, \'blue\', attrs=[\'bold\']), error_msg, ip_dst)'
elif type_option == DHCPINFORM and ('DHCPI' in type_dhcp or not type_dhcp):
option_dhcp = 'DHCPINFORM'
format_syntax = '[%s] %s [%s (%s)] %s: %s %s: %s'
value_syntax = '(time.strftime("%d/%m/%y %H:%M",time_capture), option_dhcp, mac_addr, vendor, colored(\'addr\', \'yellow\', attrs=[\'bold\']), ip_src, colored(\'host\', \'yellow\', attrs=[\'bold\']), hostname)'
else:
return
for ex in data:
if REQUEST_ADDRESS in ex:
address = ex[1]
elif ADDRESS_SERVER_DHCP in ex:
address_server_dhcp = ex[1]
elif VENDOR in ex:
vendor = ex[1].decode('utf8')
elif HOSTNAME in ex:
hostname = ex[1].decode('utf8')
elif ERROR_MESSAGE in ex:
error_msg = ex[1].decode('utf8')
if (file_out):
with open(file_out, 'a+') as fd:
fd.write('{}: {} server_dhcp={} mac={} vendor={} address={} hostname={} errorr_msg={}'.format(time.strftime("%d-%m-%y-%H-%M", time_capture), option_dhcp, address_server_dhcp, mac_addr, vendor, address, hostname, error_msg))
fd.write('\n')
print((format_syntax) % eval(value_syntax))
if __name__ == '__main__':
interface = None
type_dhcp = list()
file_out = None
logo()
op = sys.argv[1::2]
val = sys.argv[2::2]
if (len(sys.argv) < 2 or len(op) != len(val)):
help()
sys.exit(1)
# Semplice parsing delle opzioni da input
i = 0
for o in op:
if (o == '-o'):
file_out = val[index_op]
elif (o == '-t'):
if val[i] != 'DHCPD' and val[i] != 'DHCPR' and val[i] != 'DHCPN' and val[i] != 'DHCPI':
help()
sys.exit(1)
type_dhcp.append(val[i])
elif (o == '-i'):
interface = val[i]
i += 1
# Check root permissions
if (os.name == 'posix'):
if (os.getuid() != 0):
print('Please run as root')
sys.exit(1)
start = time.time()
sniff(iface=interface, prn=parser_packet, store=False, filter=('udp port 67 and port 68'))
end = time.time()-start
if (end < 60):
who_time = '{} seconds'.format(int(end))
elif (end >= 60 and end < 3600):
who_time = '{} minutes'.format(int(end/60))
else:
who_time = '{} hours'.format(int(end/3600))
print('')
print('\r[+] {}: {} devices ({} {})'.format(who_time,
len(set(TOT_DEVICES)),
len(set(REQUESTED)),
colored('connected', 'yellow', attrs=['bold'])))