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Actualiser DHCP2.py

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Polaire
2024-10-18 13:01:42 +02:00
parent 3696a98c0a
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#!/usr/bin/env python3 from scapy.all import Ether, IP, UDP, BOOTP, DHCP, sendp, sniff, RandMAC
"""scapy-dhcp-listener.py import random
Listen for DHCP packets using scapy to learn when LAN
hosts request IP addresses from DHCP Servers.
Copyright (C) 2018 Jonathan Cutrer
License Dual MIT, 0BSD
"""
from __future__ import print_function # Configuration des paramètres DHCP
from scapy.all import * DHCP_SERVER_IP = "192.168.1.10" # L'adresse IP du serveur DHCP
import time DHCP_POOL_START = "192.168.1.100" # Début de la plage d'adresses
DHCP_POOL_END = "192.168.1.200" # Fin de la plage d'adresses
SUBNET_MASK = "255.255.255.0"
ROUTER_IP = "192.168.1.2" # Adresse du routeur
DNS_IP = "192.168.1.2" # Adresse du serveur DNS
LEASE_TIME = 86400 # Durée de location en secondes
__version__ = "0.0.3" allocated_ips = set() # Pour suivre les adresses IP attribuées
# Fixup function to extract dhcp_options by key def generate_ip():
def get_option(dhcp_options, key): # Générer une adresse IP dans la plage DHCP
while True:
ip = f"192.168.1.{random.randint(100, 200)}"
if ip not in allocated_ips:
allocated_ips.add(ip)
return ip
must_decode = ['hostname', 'domain', 'vendor_class_id'] def generate_dhcp_offer(pkt):
try: if pkt.haslayer(DHCP) and pkt[DHCP].options[0][1] == 1: # Discover
for i in dhcp_options: client_mac = pkt[Ether].src
if i[0] == key: offered_ip = generate_ip()
# If DHCP Server Returned multiple name servers
# return all as comma seperated string. # Construction de la réponse DHCP Offer
if key == 'name_server' and len(i) > 2: dhcp_offer = (
return ",".join(i[1:]) Ether(dst=client_mac, src=RandMAC()) /
# domain and hostname are binary strings, IP(src=DHCP_SERVER_IP, dst='255.255.255.255') /
# decode to unicode string before returning UDP(sport=67, dport=68) /
elif key in must_decode: BOOTP(op=2, yiaddr=offered_ip, siaddr=DHCP_SERVER_IP, chaddr=client_mac) /
return i[1].decode() DHCP(options=[
else: ("message-type", "offer"),
return i[1] ("server_id", DHCP_SERVER_IP),
except: ("lease_time", LEASE_TIME),
pass ("subnet_mask", SUBNET_MASK),
("router", ROUTER_IP),
("dns", DNS_IP),
("end")
])
)
sendp(dhcp_offer, iface='eth0', verbose=False) # Remplacez 'eth0' par votre interface
def handle_dhcp_packet(packet): def start_dhcp_server():
print("Démarrage du serveur DHCP...")
# Match DHCP discover sniff(filter="udp and (port 67 or port 68)", prn=generate_dhcp_offer, store=0)
if DHCP in packet and packet[DHCP].options[0][1] == 1:
print('---')
print('New DHCP Discover')
#print(packet.summary())
#print(ls(packet))
hostname = get_option(packet[DHCP].options, 'hostname')
print(f"Host {hostname} ({packet[Ether].src}) asked for an IP")
# Match DHCP offer
elif DHCP in packet and packet[DHCP].options[0][1] == 2:
print('---')
print('New DHCP Offer')
#print(packet.summary())
#print(ls(packet))
subnet_mask = get_option(packet[DHCP].options, 'subnet_mask')
lease_time = get_option(packet[DHCP].options, 'lease_time')
router = get_option(packet[DHCP].options, 'router')
name_server = get_option(packet[DHCP].options, 'name_server')
domain = get_option(packet[DHCP].options, 'domain')
print(f"DHCP Server {packet[IP].src} ({packet[Ether].src}) "
f"offered {packet[BOOTP].yiaddr}")
print(f"DHCP Options: subnet_mask: {subnet_mask}, lease_time: "
f"{lease_time}, router: {router}, name_server: {name_server}, "
f"domain: {domain}")
# Match DHCP request
elif DHCP in packet and packet[DHCP].options[0][1] == 3:
print('---')
print('New DHCP Request')
#print(packet.summary())
#print(ls(packet))
requested_addr = get_option(packet[DHCP].options, 'requested_addr')
hostname = get_option(packet[DHCP].options, 'hostname')
print(f"Host {hostname} ({packet[Ether].src}) requested {requested_addr}")
# Match DHCP ack
elif DHCP in packet and packet[DHCP].options[0][1] == 5:
print('---')
print('New DHCP Ack')
#print(packet.summary())
#print(ls(packet))
subnet_mask = get_option(packet[DHCP].options, 'subnet_mask')
lease_time = get_option(packet[DHCP].options, 'lease_time')
router = get_option(packet[DHCP].options, 'router')
name_server = get_option(packet[DHCP].options, 'name_server')
print(f"DHCP Server {packet[IP].src} ({packet[Ether].src}) "
f"acked {packet[BOOTP].yiaddr}")
print(f"DHCP Options: subnet_mask: {subnet_mask}, lease_time: "
f"{lease_time}, router: {router}, name_server: {name_server}")
# Match DHCP inform
elif DHCP in packet and packet[DHCP].options[0][1] == 8:
print('---')
print('New DHCP Inform')
#print(packet.summary())
#print(ls(packet))
hostname = get_option(packet[DHCP].options, 'hostname')
vendor_class_id = get_option(packet[DHCP].options, 'vendor_class_id')
print(f"DHCP Inform from {packet[IP].src} ({packet[Ether].src}) "
f"hostname: {hostname}, vendor_class_id: {vendor_class_id}")
else:
print('---')
print('Some Other DHCP Packet')
print(packet.summary())
print(ls(packet))
return
if __name__ == "__main__": if __name__ == "__main__":
sniff(filter="udp and (port 67 or 68)", prn=handle_dhcp_packet) start_dhcp_server()