Way to tell if smb_fname->base_name is a fully qualified path (w/ possible streams_depot bug)

Jeremy Allison jra at samba.org
Thu Dec 1 18:43:02 UTC 2016

On Thu, Dec 01, 2016 at 08:10:23AM -0700, Trever L. Adams wrote:
> On 11/30/2016 10:39 AM, Trever L. Adams wrote:
> > With most files, the virus filter code has to prepend the connectpath.
> > With streams_depot the connectpath appears to be already prepended, in
> > the case of the default setting for where the streams are stored. I am
> > aware it can be outside the connectpath, which is one reason I need to
> > fix the above.
> >
> > In the case of smb_fname->base_name (fname above) with streams_depot,
> > when one is working with the non-default stream, contains a fully
> > qualified path. In other words, with the default streams_depot setting,
> > you end up with something like this:
> >
> > Actual file: /CONNECTPATH/.streams/0F/17/02FD000000000000EF005C0400000000/:attached.txt:$DATA: Eicar-Test-Signature
> > Appending connect path: /CONNECTPATH//CONNECTPATH/.streams/0F/17/02FD000000000000EF005C0400000000/:attached.txt:$DATA
> > When not a stream and appending connect path: /CONNECTPATH/actualfile.txt
> >
> > Is there any way to tell easily when one needs to prepend the connect
> > path and when one doesn't?
> >
> > Thank you.
> > Trever
> One possible bug in streams_depot, the file name above
> "OF/17/02FD000...." will not store in /tmp/streams or /home/streams on
> Fedora 25, but will in the default streams directory
> (CONNECTPATH/.streams). I do not know why. Permissions and all seem ok.
> Another stream named ok.txt does. So, the below hasn't been tested there
> yet, but seems like it would work.
> The solution appears to be rather simple. I have tested it for the
> file/default stream and for alternative data streams. The answer is just
> check the first character to see if it is '/'.

Yep, that's usually the way to check for an absolute path :-).
I thought you wanted to check if it had the connectpath prepended
though which is why I didn't point out the obvious 'check for /' :-).



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