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Re: [libvirt] Feature Request: sniff a virtual interface of a guest



On Fri, Jan 27, 2012 at 09:28:21AM +0100, Hendrik Schwartke wrote:
> Hi,
> 
> there is currently no support for sniffing the network traffic of a virtual
> nic, from local or remote. In some cases the debugging or monitoring of a guest
> is therefore not as easy as it could be.
> 
> Although it's easy to start a network sniffer on the physical host, it requires
> direct access to a shell and some knowledge of the current configuration of
> the virtual networks.
> 
> I think it would be a great benefit for libvirt if network sniffing would be
> possible out of the box.

Cool idea.

> One idea would be to start a local tshark sniffing on the card and connect this
> to a local socket. This could then be forwarded by ssh to a wireshark process
> running on a desktop.

I would favor doing the minimum in libvirt side to specify a packet
filter and a start/stop of the packet mirror, and then let the user
consume the resulting packet stream however they want on the client.
Other people may have more concrete suggestions.

> I created a feature request for that: https://bugzilla.redhat.com/show_bug.cgi?id=784893
> 
> Any thoughts or hints to implement that?

This seems like a good candidate for using libvirt's support for
streaming data, similar to consoles or screenshots.  Take a look
through the code for how those APIs are implemented for a guide.  

I'm not sure how familiar you are with the libvirt code, so forgive me
if you already know this: if you start with tools/virsh.c you can see
how the virsh console and virsh screenshot commands call their
respective APIs and then how those APIs use libvirt's streams to
deliver the resulting data.

Dave

> Hendrik Schwartke
> 
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