家庭网络是动态的公网IP,虽然用了ddns,但是响应IP变化的速度还是太慢,为了缩短正在连接的时候,发生IP变化导致断开的等待时间,用python写段脚本,挂到旁路由器的系统上,用linux的cron定时执行,发现公网ip变化后发邮件
    贴代码如下:

    1. import re
    2. import time
    3. from urllib import request
    4. import smtplib
    5. from email.mime.text import MIMEText
    7. ################
    8. ## 我发邮件的邮箱地址
    9. myMail = "***@***.com"
    10. ################
    12. toMailList= ['***@***.com']
    13. ################
    14. # 发邮件的SMTP服务器设置
    15. mySmtp = {"host": "smtp.***.com"
    16.      ,"user": "***"
    17.      ,"pwd": "***"
    18. }
    20. ################
    21. # 检测外网IP的网站列表
    22. testUrlParams = [{'url': 'http://members.3322.org/dyndns/getip'}
    23.     , {'url': 'http://icanhazip.com'}
    24.                  ]
    25. # log文件名
    26. logFileName = 'checkWanIp.log'
    27. # log初始内容
    28. logList = ['']
    29. # 保存上次IP信息的文件
    30. lastInfoFileName = '.lastInfo'
    33. def getWanIpInfo():
    34.     ip = None
    35.     for urlParam in testUrlParams:
    36.         ip = getRequestIpInfo(urlParam)
    37.         if ip is None:
    38.             continue
    39.         else:
    40.             return ip
    41.     return ip
    44. def getRequestIpInfo(urlParam):
    45.     global logList
    46.     wanIP = None
    47.     try:
    48.         ip = str(request.urlopen(urlParam['url']).read())
    49.         ip = re.findall(r'\d+.\d+.\d+.\d+', ip)
    50.         wanIP = ip[0]
    51.     except Exception as e:
    52.         logList.append(str(e))
    53.     return wanIP
    56. def sendMail(subject, info):
    57.     '''
    58.     发送邮件到指定的邮箱
    59.     subject: 主题
    60.     info:  邮件内容
    61.     '''
    62.     global logList
    63.     msg = MIMEText(info)
    64.     msg['Subject'] = subject
    65.     msg['From'] = myMail
    66.     msg['To'] = ";".join(toMailList)
    68.     try:
    69.         s = smtplib.SMTP();
    70.         s.connect(mySmtp['host'])
    71.         s.login(mySmtp['user'], mySmtp['pwd'])
    72.         s.sendmail(myMail, toMailList, msg.as_string())
    73.         s.close()
    74.         return True
    75.     except Exception as e: \
    76.             logList.append(str(e))
    77.     return False
    80. def readFile(fileName):
    81.     '''
    82.     读文件内容
    83.     '''
    84.     global logList
    85.     try:
    86.         # 打开文件读取文件内容
    87.         f = open(fileName, 'r')
    88.         try:
    89.             return f.read()
    90.         finally:
    91.             f.close()
    92.     except IOError:
    93.         logList.append(
    94.             "\r\n" + fileName + " - Can't open the file! Your maybe first run the script, or confirm the Read permission!")
    95.         return None
    98. def writeFile(fileName, str):
    99.     return writeFileByMode(fileName, str, 'w')  # 追加模式
    102. def writeLog(str):
    103.     return writeFileByMode(logFileName, str, 'a')  # 追加模式
    106. def writeFileByMode(fileName, str, mode):
    107.     '''
    108.     写文件内容
    109.     '''
    110.     global logList
    111.     if mode is None:
    112.         mode = 'w'  # 默认写模式
    113.         if str is None or str == '':
    114.             return False
    115.         try:
    116.             # 写入文件内容
    117.             f = open(fileName, mode)
    118.             try:
    119.                 f.write(str)
    120.                 return True
    121.             finally:
    122.                 f.close()
    123.         except IOError:
    124.             logList.append("\r\n" + fileName + " - Can't write the file! Please confirm the write permission")
    125.             return False
    128. if __name__ == '__main__':
    129.     try:
    130.         # 从网站上取得IP
    131.         ipInfo = getWanIpInfo()
    132.         if ipInfo is None or ipInfo == '':
    133.             writeLog("Get Ip Fail!\r\n")
    134.         else:
    135.             # 读取上次保存的内容
    136.             lastInfo = readFile(lastInfoFileName)
    137.             # 判断和上次取得的内容是否有变化
    138.             if lastInfo != ipInfo:
    139.                 # 把取得的内容存入文件中，下次用来进行比较
    140.                 writeFile(lastInfoFileName, ipInfo)
    141.                 # 取得开始时间字符串
    142.                 timeStr = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
    143.                 # 设置邮件主题
    144.                 subject = '[Get IP](' + timeStr + ')'
    145.                 # 发送到指定邮箱
    146.                 sendMail(subject, ipInfo)
    147.                 writeLog("".join(logList))
    148.     except Exception as e: \
    149.         writeLog(str(e) + "\r\n")

    用pscp传输python脚本文件到旁路由的系统上

    1. pscp -P 端口号 *.py 用户名@公网地址:/usr/local/bin

    armbian上操作

    1. sudo chmod +x /usr/local/bin/monitor_ip.py  #添加执行权限
    2. crontab -e

    /2 * python3 /usr/local/bin/monitor_ip.py #每2分钟执行一次

    1. service cron restart

    crontab的默认执行路径为：当前用户的根路径,如果是root用户 就是/root下 不是python脚本所在目录