python-arp Passive Information Collection

python-arp Passive Information Collection

Outline

Lateral movement when possible because unassigned IP local area network, if such a request may result unassigned IP is found (bypass testing equipment), what can be done to arp passive information gathering. Of course useless honeypot class equipment.

Code

from scapy.all import *

""" 
    arp信息被动收集
    arp op=1 arp request information(brodcast)
    arp op=2 arp reply information(unicast)
    arp gratuitous op=1 sender IP address same as target IP and sender MAC address same as target MAC address
 """


# arp
arp_info = {}
# passive arp information collection
def arp_sniff():
    return sniff(filter="arp",store=0,prn=arp_collect)


# arp information collect to dict like[IP:MAC]
def arp_collect(arp_pkg):
    mac = arp_pkg[ARP].hwsrc
    ip = arp_pkg[ARP].psrc
    # 如果mac信息没存储在arp_info中就是新发现的mac
    # 如果mac存在，分两种情况:新抓的包和原来IP不相等就是change，没有就什么都不用做
    if arp_info.get(mac) == None:
        arp_info[mac] = ip
        print(mac,":",ip)
    elif ip != arp_info[mac]:
        arp_info[mac] = ip
        print("change:")
        print(mac,":",ip)



if __name__ == "__main__":
     arp_sniff()

effect