#!/usr/bin/python

import libnetc
import string

src_ip=libnetc.name_resolve('192.168.1.2',0)
tgt_ip=libnetc.name_resolve('192.168.1.1',0)

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 = libnetc.new_interface()
  libnetc.interface_open_raw(ifc, libnetc.IPPROTO_RAW)

  pkt = libnetc.build_tcp(1025,
                80,
                1,
                0,
                libnetc.TH_SYN,
                0,
                0)
  dumphex(pkt)

  pkt = libnetc.build_ip(len(pkt),
               0,
               1,
               0,
               255,
               libnetc.IPPROTO_TCP,
               src_ip,
               tgt_ip) + pkt
                            
  dumphex(pkt)
  libnetc.do_checksum(pkt, libnetc.IPPROTO_TCP, libnetc.TCP_H)

  print 'tcp syn:'
  dumphex(pkt)

  libnetc.interface_write(ifc, pkt)