> Good evening(or afternoon, or morning), :)
>
> I've been on something of a quest, a project that (at the moment) is just for
> fun, but maybe not exclusively a game thing. I would like to create something
> like [SSH Tron](http://sshtron.zachlatta.com/); the workflow is simple:
>
> - ssh sshtron.zachlatta.com
> - You play the game
> - You get disconnected
>
> No room for shenanigans. No passing commands, no CTRL-C or CTRL-Z to kill the
> program (you do that, you get disconnected). Even so, I'm shocked it hasn't
> been hacked into oblivion. π
>
> But unfortunately, it's written in Go (a language I don't know and don't care
> to learn) and some library that's just for Go. Now I'm an experienced C/C++
> programmer - I'm all too familiar with things like buffer overflows,
> double-frees, dereferencing NULL pointers etc. but all I really know about
> SSH is basic stuff like how to configure sshd, how to generate keys and stuff
> like that. I also know a bunch of other languages, but since C is my goto
> (see what I did there? π) I started playing with libssh. I'm trying to see if
> I can figure out how to set up a program to receive incoming connections,
> send data to the client (the default ssh "command"), receive data from the
> client and disconnect. I think I've got it connecting (on localhost) but I'm
> a bit stuck on the reading/writing. ssh_channel_new is failing,
> ssh_last_error or whatever it is isn't giving me anything... and there are no
> tutorials.
>
> So what I'm asking for - if this is okay - is a high-level walkthrough of the
> process. I'm not asking you to write my program for me (people who do that
> drive me nuts too π) but I'd like to get some idea of the workflow. Like
> right now what I have is:
>
> - Some forum posts say you need to call ssh_init(), so I started there.
>
> - Then I created a "bind" structure using ssh_bind_new()
> - Then I used ssh_bind_options_set to set the host name, port, and private
> key path
> - I also used ssh_set_blocking (with 0) because a game like Tron shouldn't
> wait for the user to press Enter (like getchar())
> - Then I used ssh_new() to create a new session structure
> - Then ssh_bind_listen. At this point, my program waits for a new connection.
> Then I do ssh me@localhost -p 12345 or whatever. This seems to work.
> - Then ssh_bind_accept. It seems to accept my connection and then immediately
> disconnect. So that's progress.
> - With NULL-checks and error-checks and all that every step of the way, cuz
> this is C and that's how we roll. π
>
> And here's where I am stuck. Forum posts suggest I need to create a "channel"
> with ssh_channel_new; from there, theoretically, the ssh_channel_write and
> ssh_channel_read do the reading/writing. Then of course are all the close and
> free functions to clean up at the end. And of course to support multiple
> users it would probably have to call fork() and all that... but I'm nowhere
> near that point. ssh_channel_new fails. I tried using session->channel, but
> apparently that is a pointer to an "incomplete" type (an error I've never
> seen before and will be researching this evening after work π)... so...
> stalemate.
> Any ideas? What am I missing here? At this point, my best guess is that there
> another step required to "complete" the session's channel pointer, some
> secondary initialization involved that isn't clear from a long list of
> function names. π Any ideas would be greatly appreciated. Thanks and have a
> great day!
