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[Qemu-devel] Re: [Nbd] Transforming stdin and stdout pair into a socket
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] Re: [Nbd] Transforming stdin and stdout pair into a socket |
Date: |
Mon, 11 May 2009 10:03:43 +0200 |
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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qemu-nbd-inetd.patch
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