参考：
luit -encoding GBK telnet newsmth.net
luit -encoding GBK ssh guest@bbs.pku.edu.cn
https://cloud.tencent.com/developer/article/1634632
https://blog.csdn.net/zryoo_k/article/details/93036016
https://www.howtogeek.com/686600/remember-bbses-heres-how-you-can-visit-one-today/
https://zh.wikipedia.org/wiki/Telnet
https://github.com/bbsmirror/bbsmirror
https://www.cnblogs.com/harrymore/p/8627345.html
https://www.jianshu.com/p/8e5b7aea52b5
https://www.ruanyifeng.com/blog/2011/12/ssh_remote_login.html
https://docstore.mik.ua/orelly/networking_2ndEd/ssh/ch01_05.htm
https://zh.wikipedia.org/wiki/Secure_Shell
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