实现局域网icmp回送消息的捕捉和伪造响应消息

#!/usr/bin/python3
#by 小梅梅梅梅 网络安全作业
from scapy.all import *
def spoof(pkt):
    if pkt.getlayer(ICMP).type==8:  #
        #pkt.show()
        a=IP()
        a.dst=pkt.getlayer(IP).src
        a.src=pkt.getlayer(IP).dst
        b=ICMP()
        b.type=0
        b.id=pkt.getlayer(ICMP).id
        b.code=pkt.getlayer(ICMP).code
        b.seq=pkt.getlayer(ICMP).seq
        str=pkt.getlayer(Raw).load
        p=a/b/Raw(str)
        send(p)
        print('THIS IS OUR POCKET ################################')
        p.show()
    
#sniffing and spoofing
print('Start to sniff and spoof!')
pkt = sniff(filter='src net 10.0.2 and icmp ',prn=spoof)