前一段时间路由器刷的老毛子固件“穿透服务”中定时更新阿里DDNS失败了，用了很久第一次遇到。所以需要做个备用的措施用来实时获取公网ip信息

1、基于python实现

• 开启邮箱的SMTP功能
• 拿到授权码(不是登录密码)

#!/usr/bin/python
# -*- coding: UTF-8 -*-
import os
import re
import random
import requests
import logging
import smtplib
from email.mime.text import MIMEText
from email.header import Header
from string import Template
from email.utils import parseaddr, formataddr
# 输出日志格式
logging.basicConfig(format='%(asctime)s - %(filename)s[line:%(lineno)d] - %(levelname)s: %(message)s',
                    level=logging.INFO,
                    filename='sendWANIP.log',
                    filemode='a')
 
 
def _format_addr(s):
    """
    美化邮箱地址,用于可显示发/收件人
    :param s: 邮件地址
    :return: 美化后的地址
    """
    addr = parseaddr(s)
    return formataddr(addr)
 
def get_current_ip():
    """
    获取当前公网ip地址
    :return: 公网ip地址
    """
    ip_reg = re.compile("((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})(\\.((2(5[0-5]|[0-4]\\d))|[0-1]?\\d{1,2})){3}")
    # 可根据需求增删获取ip网址
    api_tuple = (
        "http://txt.go.sohu.com/ip/soip",
        "https://ident.me/",
        "https://ifconfig.me/ip",
        "https://icanhazip.com/",
        "https://checkip.amazonaws.com/",
        "http://members.3322.org/dyndns/getip"
    )
    url = api_tuple[random.randrange(len(api_tuple))]
    # print(url)
    r = requests.get(url)
    ip = re.findall(r'\d+.\d+.\d+.\d+', r.text)
    # ip[0]
    if re.match(ip_reg,ip[0]):
        logging.info("从{}获取地址成功!ip={}".format(url,ip))
        return ip[0]
    else:
        logging.error("从{}获取地址失败!".format(url))
        exit(-1)
 
def record_ip(params):
    """
    将最新的ip记录在文件中
    :param params: 包含ip的参数
    """
    filename="./lastwanip"
    last_wan_ip=""
    if os.path.exists(filename):
        f=open(filename,'r');
        last_wan_ip=f.readline()
        f.close()
    logging.info("从文件中读到ip地址为:{}".format(last_wan_ip))
    if last_wan_ip!= params['current_ip']:
        f = open(filename, 'w');
        f.write(params['current_ip'])
        f.close()
    else:
        logging.info("ip地址已经是最新的,无需更新")
        exit(0)
def send_mail(params):
    """
    给指定用户发送邮件
    :param params: 发送邮件信息
    :return: 0: 发送成功,>0 发送失败
    """
    # 第三方 SMTP 服务
    mail_host = "smtp.163.com"  # 设置服务器
    mail_user = "xxxx"  # 用户名
    mail_pass = "xxxxxxxx"  # 口令,即授权码不是账户密码
    receivers = sender = 'xxxx@163.com'
    # 邮件内容支持html格式，仿照的腾讯云模板
    mail_text="""
    
    
    
        
        
    
    
    
        
            
                
                    
                        
                        
                            
                                 style="word-break: break-all;box-sizing:border-box;text-align:center;min-width:320px; max-width:660px; border:1px solid #f6f6f6; background-color:#f7f8fa; margin:auto; padding:20px 0 30px; font-family:'helvetica neue',PingFangSC-Light,arial,'hiragino sans gb','microsoft yahei ui','microsoft yahei',simsun,sans-serif">
                                
                                    
                                        
                                        
                                            
                                            
                                            
                                        
                                        
                                    
                                                
                                                    
                                                        
                                                             style="width:183px; height:66px;display:block">
                                                    
                                                
                                                
                                                
                                                
                                                    
                                                        
                                                        
                                                            
                                                            
                                                            
                                                        
                                                        
                                                    
                                                                
                                                                    [DynamicIP-Notice]
                                                                
     
                                                                
                                                                    
                                                                        Your current public ip address is :
                                                                        ${current_ip}
                                                                        .
                                                                    
                                                                
     
                                                                
                                                                    
                                                                        
                                                                            Sincerely,
                                                                            
                                                                            ${device}
                                                                        
                                                                    
                                                                
                                                            
                                                
     
                                                
                                                    
                                                        
                                                        
                                                            
                                                            
                                                        
                                                        
                                                    
                                                                
                                                                    如非本人邮件，请忽略！