python检测IP地址变化并触发事件

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import time
import subprocess
from time import sleep 
import logging.config
from socket import *
import binascii
import json
import re

def search(pattern,text,flag): 
 #print(text)
 m=re.search(pattern,text)
 if m is not None:
  return m.group(flag)

def get_ip(cmd):
 ip_cur = '0.0.0.0'
 while ip_cur == '0.0.0.0':
  obj = subprocess.Popen(cmd,stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=True)
  obj.wait()
  lines = obj.stdout.readlines()      
  for eachline in lines:
   eachline= eachline.decode('gbk')
   #print(eachline)
   strs='IPv4 地址'
   if strs in eachline:    
    content=search('IPv4 地址 . . . . . . . . . . . . :(.*?)\r\n',eachline,1)
    #print(content)
    ip_cur = str(content)
    print(ip_cur)
    break  
 return ip_cur

def send_data_request(S_EUID,D_EUID,C_EUID,NA,port):
 address = (NA, port)
 s = socket(AF_INET,SOCK_DGRAM) 
 flag=1
 while flag:  
  s_EUID=binascii.a2b_hex(S_EUID)  
  d_EUID=binascii.a2b_hex(D_EUID)
  sev_type=binascii.a2b_hex(hex(22).replace('0x',''))
  Head_len=binascii.a2b_hex(hex(36).replace('0x',''))
  ICN_check=binascii.a2b_hex(hex(4444).replace('0x',''))
  packet_type=binascii.a2b_hex('0'+hex(1).replace('0x',''))  
  c_EUID=binascii.a2b_hex(C_EUID)   
  data=s_EUID+d_EUID+ sev_type+Head_len\
  +ICN_check+packet_type+c_EUID
  print(len(data))
  if not data: 
   break 
  s.sendto(data,address)
  flag=0 
 s.close()


def ip_cmp(cmd,S_EUID,D_EUID,C_EUID,NA,port,IP_cur,get_cnt): 
 ip_next=get_ip(cmd)
 get_cnt=get_cnt+1
 if time_flag:
  if ip_cur!='0.0.0.0' and ip_next !='0.0.0.0':
   if ip_cur == ip_next:
    change_flag=0
    print('change_flag='+str(change_flag))
   else:
    change_flag=1
    print('change_flag='+str(change_flag))    
    send_data_request(S_EUID,D_EUID,C_EUID,NA,port)
 return ip_next



if __name__ == '__main__':

 cmd='ipconfig'

 get_cnt=0 #ip 获取次数计数器
 T_interval=0.1 #ip 获取周期
 ip_cur='0.0.0.0' 
 ip_next='0.0.0.0'
 ip_cur=get_ip(cmd)
 #ip_cur='192.168.110.1'
 get_cnt=get_cnt+1

 time_flag=1

 S_EUID='aaaa'
 D_EUID='bbbb'
 C_EUID='cccc'
 NA='192.168.1.100' 
 port=35000

 while time_flag:
  ip_next=ip_cmp(cmd,S_EUID,D_EUID,C_EUID,NA,port,ip_cur,get_cnt)
  print('IP_next='+ip_next)
  sleep(T_interval)
  ip_cur=ip_next
  print('IP_cur='+ip_next)