参考:
https://zhuanlan.zhihu.com/p/617357186?utm_id=0
https://blog.csdn.net/Reasonss/article/details/125523086?
https://blog.csdn.net/qq_62370574/article/details/128792180?
https://blog.csdn.net/mingtingshi/article/details/119294114?
ddns:
https://github.com/jeessy2/ddns-go