#!/usr/bin/env python
# -*- coding: utf-8 -*-


''''' 
使用方法樣例 python test20.py 192.168.1.1 
(會掃描192.168.1.1-255的ip) 
多線程加速后大概十幾秒
'''
import platform
import sys
import os
import time
import threading

live_ip = 0


def get_os():
  os = platform.system()
  if os == "Windows":
    return "n"
  else:
    return "c"


def ping_ip(ip_str):
  cmd = ["ping", "-{op}".format(op=get_os()),
      "1", ip_str]
  output = os.popen(" ".join(cmd)).readlines()
  for line in output:
    if str(line).upper().find("TTL") >= 0:
      print("ip: %s is ok ***" % ip_str)
      global live_ip
      live_ip += 1
      break


def find_ip(ip_prefix):
  '''''
  給出當前的127.0.0 ，然后掃描整個段所有地址
  '''
  threads = []
  for i in range(1, 256):
    ip = '%s.%s' % (ip_prefix, i)
    threads.append(threading.Thread(target=ping_ip, args={ip, }))
  for i in threads:
    i.start()
  for i in threads:
    i.join()


if __name__ == "__main__":
  print("start time %s" % time.ctime())
  cmd_args = sys.argv[1:]
  args = "".join(cmd_args)
  ip_pre = '.'.join(args.split('.')[:-1])
  find_ip(ip_pre)
  print("end time %s" % time.ctime())
  print('本次掃描共檢測到本網絡存在%s臺設備' % live_ip)