Re: 回复：Is ssh appropriate for this use case?

[Christopher Morley <chris@xxxxxxxxxxxxxxx>]

> An example is gnash (gnu flash) which has a client and server
implementation

Is there a more up-to-date implementation somewhere? This one appears to be
more aspirational than functional (and it seems pretty dead, which makes
sense)
https://github.com/strk/gnash/blob/master/cygnal/libnet/sshserver.cpp

On Sun, Apr 12, 2020 at 5:08 AM Andreas Schneider <asn@xxxxxxxxxxxxxx>
wrote:

> On Friday, 10 April 2020 09:57:37 CEST 刘元哲 wrote:
> > Hello, Chris
> >
> >
> > I'm also learning libssh this few days, and found your problem when I
> wake
> > up at afternoon :-).
>  First of all, I think libssh tcp/ip forwarding can
> > solve your problem, u need
> > read&nbsp;
> https://blog.trackets.com/2014/05/17/ssh-tunnel-local-and-remote->
> port-forwarding-explained-with-examples.html(local port forwarding
> > part)&nbsp;to understand what&nbsp; does local port forwarding do and why
> > it's an appropriate solution. Then u can read
> > this&nbsp;https://api.libssh.org/stable/libssh_tutor_forwarding.html It
> > shows the whole architecture about tcp/ip forward on client side. It
> holds
> > one session between client(java) and server(c++), no matter how many
> > simulation processes u have, it doesn't care. I'm not familiar with java,
> > but libssh is used in C, maybe u need a JNI? Anyway once u can run this
> > function, the server side(sshd_tcpip_forward.c), should be able to
> receive
> > the request. Here to make things clear, libssh is not something u can use
> > automatic, it's NOT openssh, a prebuilt binary with many options u can
> > choose, u need to program some codes:
> > the client side in tutor only show how to open a request to server, I
> think
> > u need to make java part connect to some localhost port, see 4321,
>  then in
> > client code, u program a event_loop, check
> > here:https://api.libssh.org/stable/group__libssh__poll.html,
> > ssh_add_event_fd, use socket to listen at 4321, once something arrive,
> > forward it to server. Obviously u need to define what the date struct,
> as u
> > may have many simulation processes, and how long it
> > is.(read&nbsp;ssh_channel_open_forward CAREFULLY!!, u must understand
> what
> > the parameter should be). Now it's ready to send it, once server receive
> > it, it also need to re-direct to ur cpp listen port, here u also need
> > program with socket, like client side, use ssh_event callback.
>
> Well, if you implement the server and client side there is no need for
> port
> forwarding. You can just implement the client and server with libssh to
> secure
> the communication.
>
> All you need is a channel which reads and writes on both sides.
>
>
> An example is gnash (gnu flash) which has a client and server
> implementation
> this way.
>
>
>
>