receive.py

#!/usr/bin/env python
import sys
import struct
import os

from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr
from scapy.all import Packet, IPOption
from scapy.all import PacketListField, ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
from scapy.all import IP, TCP, UDP, Raw
from scapy.layers.inet import _IPOption_HDR, TCP, bind_layers

def get_if():
    ifs=get_if_list()
    iface=None
    for i in get_if_list():
        if "eth0" in i:
            iface=i
            break
    if not iface:
        print("Cannot find eth0 interface")
        exit(1)
    return iface

def handle_pkt(pkt):
    if IP in pkt:
        if TCP in pkt or UDP in pkt:
            print("got a packet")
            pkt.show2()
        #    hexdump(pkt)
            sys.stdout.flush()


def main():
    ifaces = [i for i in os.listdir('/sys/class/net/') if 'eth' in i]
    iface = ifaces[0]
    print("sniffing on %s" % iface)
    sys.stdout.flush()
    sniff(iface = iface,filter='inbound and tcp or udp',
          prn = lambda x: handle_pkt(x))

if __name__ == '__main__':
    main()