75 lines
2.9 KiB
Python
75 lines
2.9 KiB
Python
from scapy.all import Ether, IP, UDP, BOOTP, DHCP, sendp, sniff, RandMAC
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import random
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# Configuration des paramètres DHCP
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DHCP_SERVER_IP = "192.168.1.10" # L'adresse IP du serveur DHCP
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DHCP_POOL_START = "192.168.1.100" # Début de la plage d'adresses
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DHCP_POOL_END = "192.168.1.200" # Fin de la plage d'adresses
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SUBNET_MASK = "255.255.255.0"
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ROUTER_IP = "192.168.1.2" # Adresse du routeur
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DNS_IP = "192.168.1.2" # Adresse du serveur DNS
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LEASE_TIME = 86400 # Durée de location en secondes
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allocated_ips = set() # Pour suivre les adresses IP attribuées
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def generate_ip():
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# Générer une adresse IP dans la plage DHCP
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while True:
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ip = f"192.168.1.{random.randint(100, 200)}"
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if ip not in allocated_ips:
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allocated_ips.add(ip)
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return ip
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def generate_dhcp_offer(pkt):
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if pkt.haslayer(DHCP) and pkt[DHCP].options[0][1] == 1: # Discover
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client_mac = pkt[Ether].src
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offered_ip = generate_ip()
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# Construction de la réponse DHCP Offer
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dhcp_offer = (
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Ether(dst=client_mac, src=RandMAC()) /
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IP(src=DHCP_SERVER_IP, dst='255.255.255.255') /
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UDP(sport=67, dport=68) /
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BOOTP(op=2, yiaddr=offered_ip, siaddr=DHCP_SERVER_IP, chaddr=client_mac) /
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DHCP(options=[
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("message-type", "offer"),
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("server_id", DHCP_SERVER_IP),
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("lease_time", LEASE_TIME),
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("subnet_mask", SUBNET_MASK),
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("router", ROUTER_IP),
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("dns", DNS_IP),
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("end")
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])
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)
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sendp(dhcp_offer, iface='eth0', verbose=False) # Remplacez 'eth0' par votre interface
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def generate_dhcp_ack(pkt):
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if pkt.haslayer(DHCP) and pkt[DHCP].options[0][1] == 3: # Request
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client_mac = pkt[Ether].src
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requested_ip = pkt[DHCP].options[2][1] # Adresse IP demandée
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# Construction de la réponse DHCP ACK
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dhcp_ack = (
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Ether(dst=client_mac, src=RandMAC()) /
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IP(src=DHCP_SERVER_IP, dst='255.255.255.255') /
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UDP(sport=67, dport=68) /
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BOOTP(op=2, yiaddr=requested_ip, siaddr=DHCP_SERVER_IP, chaddr=client_mac) /
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DHCP(options=[
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("message-type", "ack"),
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("server_id", DHCP_SERVER_IP),
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("lease_time", LEASE_TIME),
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("subnet_mask", SUBNET_MASK),
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("router", ROUTER_IP),
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("dns", DNS_IP),
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("end")
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])
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)
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sendp(dhcp_ack, iface='eth0', verbose=False) # Remplacez 'eth0' par votre interface
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def start_dhcp_server():
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print("Démarrage du serveur DHCP...")
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sniff(filter="udp and (port 67 or port 68)", prn=lambda x: generate_dhcp_offer(x) if x.haslayer(DHCP) and x[DHCP].options[0][1] == 1 else generate_dhcp_ack(x), store=0)
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if __name__ == "__main__":
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start_dhcp_server()
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