Re: [Nbd] Transforming stdin and stdout pair into a socket

[Laurent V. <Lau...@bu...>]

Le dimanche 10 mai 2009 à 21:19 +0300, Ciprian Dorin, Craciun a écrit :
> Hello all!

Hi,

perhaps the attached patch I wrote last year (november) is what you
want...

I didn't try to apply it to an up-to-date qemu-nbd.

Regards,
Laurent

>     Today I've played around with NBD (Network Block Disk), and
> qemu-nbd (a NBD client that exports QEMU disks as NBD's).
> 
>     My problem is the following: both NBD kernel module and qemu-nbd
> implementation expect to use a socket in order to communicate.
>     This means that in order to securely tunnel the connection over
> SSH (OpenSSH), I need an intermediary process that creates a socket
> and forwards all input / output between this socket and stdin / stdout
> (which are in fact pipes received from OpenSSH).
> 
>     My question is: can I somehow make the pair of stdin / stdout seem
> as a socket to the Linux syscalls (read and write)? (I would have to
> make stdin / stdout pair look like a single file descriptor.) (This
> would eliminate the intermediate process that just pipes data, and
> thus reduce the overhead.)
> 
>     Just to be clear: I know how to trick an application to have it's
> stdin and stdout be an opened socket (by using dup syscall). But in
> this case I need to trick the Linux kernel into thinking that stdin /
> stdout pair is a socket (or a single file descriptor).
> 
>     Thank you,
>     Ciprian Craciun.
> 
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