receive.py

#!/usr/bin/env python
import sys
import struct
import os
import argparse
from scapy.all import sniff, sendp, hexdump, get_if_list, get_if_hwaddr, bind_layers
from scapy.all import Packet, IPOption
from scapy.all import PacketListField, ShortField, IntField, LongField, BitField, FieldListField, FieldLenField
from scapy.all import IP, UDP, TCP, Ether
from scapy.layers.inet import _IPOption_HDR
from scapy.fields import *

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):
    print "got a packet"
    pkt.show2()
#    hexdump(pkt)
    sys.stdout.flush()

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("-k", "--if2", help="host-eth", default='h1-eth0')
    args = parser.parse_args()
    
    ifaces = filter(lambda i: 'eth' in i, os.listdir('/sys/class/net/'))
    #iface = ifaces[0]
    #iface = 's2-eth2'
    iface=args.if2
    print "sniffing on %s" % iface
    sys.stdout.flush()
    sniff(iface = iface,
          prn = lambda x: handle_pkt(x))

if __name__ == '__main__':
    main()