import sys,socket,getopt,threading,subprocess
l=False;c=False;u=False;e="";t="";d="";p=0
def RC(C):
 C=C.rstrip()
 try:O=subprocess.check_output(C,stderr=subprocess.STDOUT,shell=True)
 except:O="exe fail\n"
 return O
def CH(CS):
 global u,e,c
 if len(d):
  fb=""
  while True:
   da=CS.recv(1024)
   if not da:
    break
   else:
    fb+=da
  try:
   file_descriptor=open(d, "wb")
   file_descriptor.write(fb)
   file_descriptor.close()
   CS.send("Pass %s\n" % d)
  except:
   CS.send("Fail %s\n" % d)
 if len(e):
  op=RC(e)
  CS.send(op)
 if c:
  while True:
   CS.send(": ")
   cb=""
   while "\n" not in cb:
    cb += CS.recv(1024)
   r=RC(cb)
   CS.send(r)
def SL():
 global t,p
 if not len(t):
  t="0.0.0.0"
 S=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 S.bind((t, p))
 S.listen(5)
 while True:
  client_socket, addr=S.accept()
  client_thread=threading.Thread(target=CH, args=(client_socket,))
  client_thread.start()
def sn(bu):
 cl=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
 try:
  cl.connect((t,p))
  if len(bu):
   cl.send(bu)
  while True:
   recv_len=1
   re=""
   while recv_len:
    da=cl.recv(4096)
    recv_len=len(da)
    re+=da
    if recv_len<4096:
     break
   print re,
   bu=raw_input("")
   bu+="\n"
   cl.send(bu)
 except:
  print "Excpt"
  cl.close()
def use():
 print "Use: nc.py -t target_host -p port"
 print "-l listen"
 print "-e exec=file"
 print "-c command"
 print "-u upload=path"
 sys.exit(0)
def main():
 global l,p,e,c,d,t
 if not len(sys.argv[1:]):
  use()
 try:
  opts, args=getopt.getopt(sys.argv[1:], "hle:t:p:cu:")
 except getopt.GetoptError as err:
  print str(err)
  use()
 for o, a in opts:
  if o in ("-h"):use()
  elif o in ("-l"):l=True
  elif o in ("-e"):e=a
  elif o in ("-c"):c=True
  elif o in ("-u"):d=a
  elif o in ("-t"):t=a
  elif o in ("-p"):p=int(a)
  else: assert False, "bad option"
 if not l and len(t) and p > 0:
  bu=sys.stdin.read()
  sn(bu)
 if l:
  SL()
main()