# -*- coding:utf-8 -*-

import urllib
import urllib2
import socket
import types
import time
import os
import subprocess


class Login:
    # 初始化
    def __init__(self):
        self.username = '3331*S******'
        self.password = '******'
        self.ip_pre = '219.223'
        # 检测间隔时间，单位为秒
        self.every = 5*60  # second

    # 模拟登录
    def login(self):
        print self.getCurrentTime(), u"正在尝试认证UTSZ无线网络........"
        data = {
            'action':'login',
            "username": self.username,
            "password": self.password,
            "ac_id": 1,
            "user_ip:": "",
            "nas_ip": "",
            "user_mac": "",
            "save_me": 1,
            "ajax": 1,
        }
        # 消息头
        headers = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) '
                          'AppleWebKit/537.36 (KHTML, like Gecko) '
                          'Chrome/45.0.2454.101 Safari/537.36',
            'Host': '10.0.10.66',
            'Origin': 'http://10.0.10.66',
            'Referer': 'http://10.0.10.66/srun_portal_pc.php?ac_id=1&url='
        }

        post_data = urllib.urlencode(data)
        login_url = "http://10.0.10.66/include/auth_action.php"
        request = urllib2.Request(login_url, post_data, headers)
        response = urllib2.urlopen(request)
        result = response.read()  # .decode('gbk')
        self.getLoginResult(result)

    # 打印登录结果
    def getLoginResult(self, result):
        if "login_ok" in result:
            print self.getCurrentTime(), 'login_ok'
        else:
            print self.getCurrentTime(), result

    # 获取本机无线IP
    def getIP(self):
        local_iP = socket.gethostbyname(socket.gethostname())
        if self.ip_pre in str(local_iP):
            return str(local_iP)
        ip_lists = socket.gethostbyname_ex(socket.gethostname())

        for ip_list in ip_lists:
            if isinstance(ip_list, list):
                for i in ip_list:
                    if self.ip_pre in str(i):
                        return str(i)
            elif type(ip_list) is types.StringType:
                if self.ip_pre in ip_list:
                    return ip_list

    # 判断当前是否可以联网
    def canConnect(self):
        fnull = open(os.devnull, 'w')
        result = subprocess.call('ping www.baidu.com', shell=True, stdout=fnull, stderr=fnull)
        fnull.close()
        if result:
            return False
        else:
            return True

    # 获取当前时间
    def getCurrentTime(self):
        return time.strftime('[%Y-%m-%d %H:%M:%S]', time.localtime(time.time()))

    # 主函数
    def main(self):
        print self.getCurrentTime(), u"您好，欢迎使用模拟登陆系统"
        while True:
            nowIP = self.getIP()
            if not nowIP:
                print self.getCurrentTime(), u"请检查是否正常连接UTSZ无线网络"
            else:
                print self.getCurrentTime(), u"成功连接了UTSZ网络,本机IP为", nowIP
                self.login()
                while True:
                    if not self.canConnect():
                        if not self.getIP():
                            print self.getCurrentTime(), u"当前已经掉线，请确保连接上了UTSZ网络"
                        else:
                            print self.getCurrentTime(), u"当前已经掉线，正在尝试重新连接"
                            self.login()
                    else:
                        print self.getCurrentTime(), u"当前网络连接正常"
                    time.sleep(self.every)
            time.sleep(self.every)

login = Login()
login.main()

【参考资料】

1. 博主 http://cuiqingcai.com/1052.html