libvirt users - Jan 2016 - Re: unable to dissect libvirt rpc packets using wireshark plugin

Hi,
I am trying libvirt plugin in wireshark to dissect RPC payload in TCP, but
finding dissector code not really working.

My env is Fedora core 21 (x86_64) and installed packages are as follow:

     wireshark-1.12.6-1.fc21.x86_64
     libvirt-wireshark-1.2.9.3-2.fc21.x86_64


Earlier, just after installation, I noticed libvirt.so available only in
/usr/lib64/wireshark/plugins/1.12.5/ . Wireshark could not load libvirt 
plugin.
So, I copied above .so into 1.12.6/ under same plugins folder, following it
wireshark could list libvirt as supported protocol.

     tshark -G protocols | grep libvirt
     Libvirt    libvirt    libvirt

However, on checking with some pcaps which has libvirt RPC calls captured on
wire, wireshark does not list libvirt RPC packets, as I search for
"libvirt"
protocol in pcap.

Have anyone experienced this before or if you have any pointer that I could
check in my env, that would be very helpful.

-- 
Regards,
Gowrishankar M

On 26.10.2015 11:38, gowrishankar wrote:
> 
> Hi,
> I am trying libvirt plugin in wireshark to dissect RPC payload in TCP, but
> finding dissector code not really working.
> 
> My env is Fedora core 21 (x86_64) and installed packages are as follow:
> 
>     wireshark-1.12.6-1.fc21.x86_64
>     libvirt-wireshark-1.2.9.3-2.fc21.x86_64
> 
> 
> Earlier, just after installation, I noticed libvirt.so available only in
> /usr/lib64/wireshark/plugins/1.12.5/ . Wireshark could not load libvirt
> plugin.
Yes, this is inherently broken. See my patch that I've just proposed:

https://www.redhat.com/archives/libvir-list/2015-October/msg00852.html
> So, I copied above .so into 1.12.6/ under same plugins folder, following it
> wireshark could list libvirt as supported protocol.
> 
>     tshark -G protocols | grep libvirt
>     Libvirt    libvirt    libvirt
> 
> However, on checking with some pcaps which has libvirt RPC calls
> captured on
> wire, wireshark does not list libvirt RPC packets, as I search for
> "libvirt"
> protocol in pcap.
What is the command you're trying? Because if I copy the plugin over to
the correct directory it seems to be working for me.
> 
> Have anyone experienced this before or if you have any pointer that I could
> check in my env, that would be very helpful.
> 
Michal

Hi Michal,
Thank you for your suggestion. My apologies that I took sometime to get back
on further confirmation. Regrettably, my tshark is still unable to find 
libvirt payload
inside packet capture, though it lists libvirt as a possible filter.

      # rpm -ql libvirt-wireshark-1.2.9.3-2.fc21.x86_64
      /usr/lib64/wireshark/plugins/1.12.5/libvirt.so

      As I used wireshark 1.12.6 version, I created 1.12.6 directory 
under plugins and copied above .so.
      /usr/lib64/wireshark/plugins/1.12.6/libvirt.so

      # tshark -G protocols | grep -i libvirt
      Libvirt    libvirt    libvirt

      # tshark -r libvirt.pcap libvirt
      #

Are there any dependency between libvirt and wireshark dissector 
mechanism to co-exist and
work together (ie. whether the above libvirt-wireshark missing some 
changes that dissector
expecting ??). If you have sample pcap to recheck my wireshark/tshark, 
could you please
share with me ?

Regards,
Gowrishankar

On Thursday 29 October 2015 06:18 PM, Michal Privoznik
wrote:
> On 26.10.2015 11:38, gowrishankar wrote:
>> Hi,
>> I am trying libvirt plugin in wireshark to dissect RPC payload in TCP,
but
>> finding dissector code not really working.
>>
>> My env is Fedora core 21 (x86_64) and installed packages are as follow:
>>
>>      wireshark-1.12.6-1.fc21.x86_64
>>      libvirt-wireshark-1.2.9.3-2.fc21.x86_64
>>
>>
>> Earlier, just after installation, I noticed libvirt.so available only
in
>> /usr/lib64/wireshark/plugins/1.12.5/ . Wireshark could not load libvirt
>> plugin.
> Yes, this is inherently broken. See my patch that I've just proposed:
>
> https://www.redhat.com/archives/libvir-list/2015-October/msg00852.html
>
>> So, I copied above .so into 1.12.6/ under same plugins folder,
following it
>> wireshark could list libvirt as supported protocol.
>>
>>      tshark -G protocols | grep libvirt
>>      Libvirt    libvirt    libvirt
>>
>> However, on checking with some pcaps which has libvirt RPC calls
>> captured on
>> wire, wireshark does not list libvirt RPC packets, as I search for
>> "libvirt"
>> protocol in pcap.
> What is the command you're trying? Because if I copy the plugin over to
> the correct directory it seems to be working for me.
>
>> Have anyone experienced this before or if you have any pointer that I
could
>> check in my env, that would be very helpful.
>>
> Michal
>
>
>