Re: [Ssh-sftp-perl-users] Using Net::SSH2 as a file handle

[David R. <dbr...@cp...>]

On Friday January 20, 2006 09:22, Bryan Bueter wrote:
> >
> > Ah, then there's the problem.  Fileno tries to get a real Unix filehandle
> > out
> > of the object; since it isn't a real Unix file, you won't get one.
> >
> > Maybe something can be worked out with pipes so that it really is a handle
> > (create a pipe, send the channel data to one end, give expect the other
> > end)
> > but it's beyond the scope of the current implementation.
> 
> Ok, forgive me if my ignorance misses something here.
> 
> Why not just implement channel as a real filehandle?  You would still do
> everything as is, but only now you could create a shell, then print things
> directly to and read things directly from it.

Because it's not a real file.  It's a stream multiplexed over an encrypted 
socket connection formatted by the ssh protocol.  If you read the raw socket 
you'd get ssh frames and encrypted data.

> Which begets the question: What AM I to do with a shell created by
> $chan->shell() ?  Do I have to keep polling this to know when I can write
> to it?  I havnt been able to do much with this other then print out the
> first couple of lines after it connects.  Printing directly to it and/or
> execing on top of shell doesnt seem to produce any more output then that.

You don't exec on top of shell - exec is like exec(2) and doesn't let you run 
subsequent operations.  When you have a shell channel you can send it 
commands and read back the responses using the standard I/O commands in 
Net::SSH2::Channel (or with filehandle ops using the tie).

> An example might be handy, and/or some further documentation.

If you get a chance to write one please submit it for inclusion.

Thanks,

-- 
Dave
Isa. 40:31