Scapy Example

Scapy Example

Traceroute

#!/usr/bin/python3
from scapy.all import *
​
TARGET = '8.8.8.8'
MAX_TTL = 14
TIMEOUT = 1.5
​
ip = IP()
icmp = ICMP()
​
ip.dst = TARGET
​
ip.ttl = (1,MAX_TTL)
p = ip/icmp
ans, uans= sr(p, timeout=TIMEOUT)
​
for snd, rcv in ans:
        result = str(snd.ttl) + '\t' + rcv.src
        if rcv.src == TARGET:
                result += ' \t <== TARGET!'
                print(result)
                break
    print(result)

sniff and spoof

sniff echo-request and spoof echo-reply

#!/usr/bin/python3
from scapy.all import *
​
TARGET = '192.168.41.140'
spoof_ip = '8.8.8.8'
​
def spoof(pkt):
        pkt.show()
        ip = IP()
        ip.src = spoof_ip
        ip.dst = TARGET
        icmp = ICMP()
        icmp.type = 'echo-reply'
        icmp.id = pkt[2].id
        icmp.seq = pkt[2].seq
        p = ip/icmp/pkt[3]
        send(p)
​
pkt = sniff(filter='icmp[icmptype] == icmp-echo', prn=spoof)