Re: remote emacspeak solution for IP masquerade problem

[Jerry Sievers <jerry@xxxxxxxxxxx>]

As for the ssh tunneling to reach remote machines also not directly
accessible, I will certainly get this R&D'd also and I do in fact need
that as well in the near future.


"T. V. Raman" <raman@xxxxxxxxxxx> writes:

> The other bit to mix into the remote fifo plus ssh hack is ssh
> port forwarding ---
> so for instance if you cant ssh directly from either end, but go
> through a firewall intermediary, you can still connect the server
> end to end.
> 
> 
> 
> >>>>> "Jerry" == Jerry Sievers <jerry@xxxxxxxxxxx> writes:
>     Jerry> Just put together a quick prototype which uses some
>     Jerry> neat Unix plumbing to use 2 outbound ssh connections
>     Jerry> rather than one out and one in bound.  The inbound
>     Jerry> method of doing remote problematic if your machine
>     Jerry> isn't accessible from the internet due to masquerading
>     Jerry> or packet filtering.
>     Jerry> 
>     Jerry> The solution can be done with not more than a few
>     Jerry> lines of shell code (see below for narrative).  I will
>     Jerry> need to R&D this a bit more so that it can handle
>     Jerry> server restart properly.  This exercise was a proof of
>     Jerry> concept.
>     Jerry> 
>     Jerry> 1. On the remote machine, make a pipe FIFO file
>     Jerry> somewhere.
>     Jerry> 
>     Jerry> 2. On the remote machine, create a server script named
>     Jerry> for example, outloud-remote and place it in the
>     Jerry> servers directory.  This is a one liner script that
>     Jerry> does nothing except to exec a cat command which will
>     Jerry> write stdin to the pipe file.
>     Jerry> 
>     Jerry> 3. Of course, make this your DTK_PROGRAM
>     Jerry> 
>     Jerry> 4. On the local machine, start an ssh command that
>     Jerry> does a cat pipe on the remote machine and writes its
>     Jerry> output into your locally running synth .  Put this in
>     Jerry> the background.  You will hear the startup message
>     Jerry> from the synth immediatly.
>     Jerry> 
>     Jerry> 5. Finally, ssh into the remote machine again and
>     Jerry> start emacspeak.
>     Jerry> 
>     Jerry> The object is that we are using the pipe file as a
>     Jerry> point to link up the synth commands coming from the
>     Jerry> remote emacs session .  Since we can't connect back to
>     Jerry> our local workstation, our workstation will start the
>     Jerry> synth program locally and read it's input from that
>     Jerry> pipe which we've connected withg using the extra
>     Jerry> outbound ssh.
>     Jerry> 
>     Jerry> If there's any interest in this, I'll post the scripts
>     Jerry> themselves when they are developed completely.
>     Jerry> 
>     Jerry> Have fun
>     Jerry> 
>     Jerry> --
>     Jerry> -------------------------------------------------------------------------------
>     Jerry> Jerry Sievers 305 854-3001 (home) WWW ECommerce
>     Jerry> Consultant 305 321-1144 (mobile
>     Jerry> http://www.JerrySievers.com/
>     Jerry> 
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> -- 
> Best Regards,
> --raman
> 
>       
> Email:  raman@xxxxxxxxxxx
> WWW:    http://emacspeak.sf.net/raman/
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> 
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-- 
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Jerry Sievers   305 854-3001 (home)     WWW ECommerce Consultant
                305 321-1144 (mobile	http://www.JerrySievers.com/

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