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Re: [Qemu-devel] [PATCH v2 3/4] sockets: add AF_VSOCK support


From: Kashyap Chamarthy
Subject: Re: [Qemu-devel] [PATCH v2 3/4] sockets: add AF_VSOCK support
Date: Sun, 5 Nov 2017 19:59:59 +0100
User-agent: Mutt/1.6.0.1 (2016-04-01)

[Reviving a more than 1-year old thread.  I randomly noticed this (refer
below) while browsing through AF_VSOCK changes in my 'qemu-devel'
maildir.]

On Tue, Oct 18, 2016 at 11:21:23AM +0100, Stefan Hajnoczi wrote:
> On Mon, Oct 17, 2016 at 09:25:46AM -0500, Eric Blake wrote:
> > On 10/16/2016 08:35 AM, Stefan Hajnoczi wrote:
> > 
> > >>> +
> > >>> +    if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
> > >>
> > >> This says stop at the first comma after the colon...
> > >>
> > >>> +        error_setg(errp, "error parsing address '%s'", str);
> > >>> +        return NULL;
> > >>> +    }
> > >>> +    if (str[n] != '\0') {
> > >>> +        error_setg(errp, "trailing characters in address '%s'", str);
> > >>
> > >> ...but this rejects a trailing comma.  Is a trailing comma possible base
> > >> on how QemuOpts work? If so, do you need to handle it here?
> > > 
> > > Actually I just wanted to grab characters up until the end of string.
> > > It wasn't clear from the sscanf(3) man page what the best way to do that
> > > was, so I kept the comma which is also used in tcp addresses (because
> > > they support additional comma-separated options).
> > 
> > %32s instead of %32[^,] should grab up to all 32 remaining characters in
> > the string; your %n trick then ensures there is no garbage.  I guess
> > it's still a question of whether we want to always treat a comma as
> > trailing garbage.
> 
> No comma options are currently accepted.  Treating comma as garbage
> seems okay.
> 
> Mike: Please change %32[^,] to %32s when merging.  Thanks!

The above change didn't take place while merging at that time as part of
v2.7.0-1720-g6a02c80.

I still see %32[^,] in all the sscanf(3) calls in
util/util/qemu-sockets.c

Is it still important to change?

-- 
/kashyap



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