[clamav-users] Scanning a large file through HTTP

[Saurav Sarkar]

Thanks a lot Paul and Ged for your replies.

Perhaps i added too many confusing points in my question :).

If i just consider myself as a developer of the HTTP Service for malware
scanning.

I would just like to know what could be the maximum file size which can be
supported by ClamAV ?

Is it 4 GB ? Can this size be increased ?

Is the memory or persistent storage a limit for ClamAV to scan a file ? if
it is a persistent storage then can i increase the limit by attaching an
external NFS ?

Best Regards,
Saurav

On Wed, Apr 7, 2021 at 8:45 PM Paul Smith via clamav-users <
clamav-users at lists.clamav.net> wrote:

> On 07/04/2021 15:38, Saurav Sarkar via clamav-users wrote:
> >
> > We have files like CAD files which can go in GBs and want to send to
> > this malware scanning service.
>
> Why are you scanning CAD files?
>
> Can your CAD files contain arbitrary executable code which is blindly
> executed by the CAD software? If not, there's no reason to scan them? If
> they can, then I'd consider getting different CAD software...
>
>
> > Is there a possibility to send the file in chunks and get it scanned
> > in the server side in chunks
>
> That would depend on the HTTP scanning service software. Clam AV needs
> the whole file at once to scan it, but the HTTP scanning service may be
> able to upload in chunks and reassemble it before sending it to Clam AV.
>
>
> >
> > I observed that there is a INSTREAM command in clamd for this purpose
> > and also there is a 4GB size limit.
> > https://linux.die.net/man/8/clamd <https://linux.die.net/man/8/clamd>
>
> INSTREAM basically lets you send a file to clamd, it saves it as a
> temporary file, and then scans it, then deletes it. It lets you scan
> files that don't exist on the same computer as the clamd daemon without
> having to set up network shares etc. So, all the limits (eg the 4GB
> limit) which apply to normal files also apply to INSTREAM
>
> --
>
> Paul
> Paul Smith Computer Services
> support at pscs.co.uk - 01484 855800
>
>
> --
>
>
> Paul Smith Computer Services
> Tel: 01484 855800
> Vat No: GB 685 6987 53
>
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