Negotiating telnet options?
reddit / bbs

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[deleted] · 2018-03-26 18:10

[removed]

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kevinlamonte · 2018-03-29 22:42

Aw dang I just saw this.  Hope the thread isn't deleted.

It could be as simple as sending options to the client.  Mystic does
that, over [here](https://github.com/klamonte/mysticbbs/blob/master/md
l/m_io_sockets.pas) at the very end you can see that they blindly send
the options for 8-bit, go-ahead, and echo, which result in an 8-bit
clean channel.

But telnet actually supports a lot more including resizing windows and
environment variables.  Over
[here](https://github.com/klamonte/jexer/tree/master/src/jexer/net) I
have a Java version of a full telnet client and server, that
automatically do 8-bit clean but also support more options like NAWS.
If C is more your thing, there is also a IMHO much less readable C
telnet client/server [here](https://github.com/klamonte/qodem/blob/mas
ter/source/netclient.c) (also rlogin, bare socket, and hooks for an
ssh library).