#!/usr/bin/python

import libnet
import string
import libnetc

tgt_eth='\x00\x00\x00\x00\x00\x00'
broadcast_eth='\xff\xff\xff\xff\xff\xff'
src_ip='\xc0\xa8\x01\x02'
tgt_ip='\xc0\xa8\x01\x01'
#payload='arp packets can carry data?  who knew!'
payload=None

def dumphex(s):
    bytes = map(lambda x: '%.2x ' % x, map(ord, s))
    if len(s)>16:
      for i in range((len(s)+16)/16*16, 15, -16):
        bytes.insert(i,'\n')
    print string.join(bytes, '')


if __name__=="__main__":

  ifc = libnet.interface()
  ifc.open_link(libnet.select_device(None))
  src_eth = ifc.get_hwaddr()
  print 'source ethernet address:'
  dumphex (src_eth)

  pkt = libnet.packet()
  pkt.build_arp(libnetc.ARPHRD_ETHER,
                            libnetc.ETHERTYPE_IP,
                            libnetc.ETHER_ADDR_LEN,
                            4,
                            libnetc.ARPOP_REQUEST,
                            src_eth,
                            src_ip,
                            tgt_eth,
                            tgt_ip)

  pkt.build_ethernet(broadcast_eth,src_eth, libnetc.ETHERTYPE_ARP)

  dumphex(pkt.getvalue())

  ifc.write(pkt)