[macOS] 获取华硕ASUS路由器公网IP

0x00 获取公网IP

背景
- 台式机电源插在小米插座上
- 台式机设置上电自启动
- 通过远程控制小米插座的上电启动台式机
- 通过DDNS的域名远程连接台式机
问题
有时候DDNS不稳定（一直使用的花生壳），死活连不上。
解决
希望台式机启动后自动上报路由器的公网IP到手机上的微信，然后通过此IP连接台式机。

0x01 Python

用Python编写脚本实现上述逻辑：

查询ASUS路由器的公网IP
方案有很多：
1. 通过公共服务查询，如：https://api.ipify.org/
2. 通过命令查询，如：traceroute -m 5 baidu.com
3. 登录路由器直接获取
第一种方便，但是免费的接口调用有限制，太频繁会被封。第二种有的时候只能获取网关地址，获取不到路由器的IP。这里选择方案三。通过chrome页面上右击选择 inspect > Network 查看登录的请求。模拟这个请求即可（Copy as curl很好用）。
将查询到的公网IP发到QQ邮箱
这个使用SMTP即可，具体步骤可以参考这里。需要注意的是QQ邮箱是用授权码登录的，不是QQ密码。
微信接收QQ邮箱的新邮件提醒
打开微信：我 > 设置 > 通用 > 辅助功能 > QQ邮箱提醒 打开即可。

代码如下：

#!/usr/bin python3
# coding:utf-8

import re
import time
import requests
import smtplib
from email.mime.text import MIMEText
from email.utils import formataddr

global_sleep = 60
global_ip = None


def get_wan_ip():
    login_url = 'http://router.asus.com/login.cgi'
    main_url = 'http://router.asus.com/index.asp'
    logout_url = 'http://router.asus.com/Logout.asp'
    headers = {
        'Pragma': 'no-cache',
        'Cache-Control': 'no-cache',
        'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
        'Origin': 'http://router.asus.com',
        'Referer': 'http://router.asus.com/Main_Login.asp'
    }
    body = {
        'action_wait': 5,
        'current_page': 'Main_Login.asp',
        'next_page': 'index.asp',
        'login_authorization': 'your authorization key get from chrome'
    }
    wan_ip = None
    try:
        login_resp = requests.post(login_url, data=body, headers=headers)
        cookie = login_resp.cookies

        main_resp = requests.get(url=main_url, cookies=cookie)
        main_text = main_resp.text
        for line in main_text.splitlines():
            if 'function wanlink_ipaddr' in line:
                ips = re.findall(r"\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b", line)
                if len(ips):
                    wan_ip = ips[0]
                    break
        requests.get(url=logout_url, cookies=cookie)
    except Exception as e:
        print(e)
    return wan_ip


def send_mail(ip):
    print("Send mail: " + ip)
    mail_addr = 'your_qq@qq.com'
    mail_pwd = 'your auth key'
    try:
        context = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
        msg = MIMEText(context, 'plain', 'UTF-8')
        msg['From'] = formataddr(["WAN IP", mail_addr])
        msg['To'] = formataddr(["ttdevs", mail_addr])
        msg['Subject'] = ip
        server = smtplib.SMTP_SSL("smtp.qq.com", 465)
        server.login(mail_addr, mail_pwd)
        server.sendmail(mail_addr, [mail_addr], msg.as_string())
        server.quit()
        print("Send mail success.")
    except smtplib.SMTPException as e:
        print(e)


if __name__ == '__main__':
    while True:
        ip = get_wan_ip()
        print("New ip: %s, old ip: %s" % (ip, global_ip))
        if ip is not None:
            if global_ip is None or ip != global_ip:
                send_mail(ip)
                global_ip = ip
        time.sleep(global_sleep)

0x02 Automator

创建
- Open Automator
- New Document
- Application
- Run Shell Script
- Input: $(which python3) /Users/ttdevs/Desktop/WAN_IP/wan_ip.py
- Save: /Users/ttdevs/Desktop/WAN_IP/WAN_IP.app

配置权限
System Preference > Privacy > Full Disk Access > Checked WanIP.app
若不配置，执行时会报权限错误。

0x03 Configuration

创建 /Library/LaunchDaemons/com.ttdevs.WanIP.plist

➜  ~ cd /Library/LaunchDaemons
➜  LaunchDaemons sudo touch com.ttdevs.WanIP.plist
Password:
➜  LaunchDaemons ls -l com.ttdevs.WanIP.plist
-rw-r--r--  1 root  wheel  0 Jun 18 11:08 com.ttdevs.WanIP.plist
➜  LaunchDaemons

若所有者非root则需切换：sudo chown root /Library/LaunchDaemons/com.ttdevs.WanIP.plist

配置 /Library/LaunchDaemons/com.ttdevs.WanIP.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.ttdevs.WanIP</string>
    <key>Program</key>
    <string>/Users/ttdevs/Desktop/WanIP/WanIP.app/Contents/MacOS/Automator Application Stub</string>
    <key>ProgramArguments</key>
    <array/>
    <key>KeepAlive</key>
    <true/>
    <key>RunAtLoad</key>
    <true/>
</dict>
</plist>

Program中需填绝对路径

加入自动项目
sudo launchctl load -w /Library/LaunchDaemons/com.ttdevs.WanIP.plist
取消自启动项
sudo launchctl unload -w /Library/LaunchDaemons/com.ttdevs.WanIP.plist

[macOS] 获取华硕ASUS路由器公网IP

0x00 获取公网IP

0x01 Python

0x02 Automator

0x03 Configuration

0xFF Reference