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<div class="moz-cite-prefix">On 9/12/18 5:41 PM, Sergey Bronnikov
wrote:<br>
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<div dir="ltr">ср, 12 сент. 2018 г. в 12:09, Xu Han <<a
href="mailto:xuhan@redhat.com" moz-do-not-send="true">xuhan@redhat.com</a>>:<br>
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<div class="m_-6802739582567604629moz-cite-prefix">On
9/12/18 7:58 AM, Cleber Rosa wrote:<br>
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<pre class="m_-6802739582567604629moz-quote-pre">On 9/11/18 5:43 AM, Sergey Bronnikov wrote:
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<pre class="m_-6802739582567604629moz-quote-pre">Hello!
avocado-vt uses network sniffer (tshark or tcpdump) for getting
IP address of running guest OS. QEMU has an option to dump network
traffic to a file. Using this option looks simpler than using of
external sniffer . I believe there were reasons to prefer sniffer
instead of qemu dump option. Can someone tell about them?
Sergey
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<pre class="m_-6802739582567604629moz-quote-pre">Sergey,
It'd be nice to try to rewrite the "sniffing" code in terms of "-object
filter-dump" (AKA "-net dump").
I see that there are some limitations in the QEMU builtin network dump,
but we can always use such an implementation when appropriate.</pre>
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<p>It's a good idea to use '-net dump' functionality for
getting IP addresses, parsing pcap format files is
always be easy than parsing plain text generated by
those sniffer tools.<br>
</p>
<p>However, my concern is that this method is a little bit
aggressive, I'm not sure if enabling this function for
a guest would affect the other part of the network
function. And please be noted that a well functioning
QEMU is the guarantee for us to get the correct IP
addresses, while the QEMU is the box that we are
testing.<br>
</p>
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<div>Please take into account that there are many projects
(including mine) where Avocado-VT used not for testing QEMU
but for testing software _inside_ QEMU.<br>
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<p>Sergey,<br>
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<p>OK, I see. So I'd suggest to make "-net dump" be the third
sniffing method, and keep the previous two for QEMU testing.
Thanks.<br>
</p>
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<p>Cleber,</p>
<p>Is there a better way in Avocado to do this kind of test rather
than using Avocado-VT?<br>
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<p><br>
</p>
Thanks,<br>
Xu<br>
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<pre class="m_-6802739582567604629moz-quote-pre">Xu has written the tshak backend, so I bet he knows more about it.</pre>
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<p>Honestly speaking, I have no idea about why it used
tcpdump not others.. The reason of adding the
tshark(wireshark) support is, sometimes, tcpdump has the
problem to get <span
id="m_-6802739582567604629result_box"
class="m_-6802739582567604629short_text" lang="en"><span>the
right informaion (see <a
class="m_-6802739582567604629moz-txt-link-freetext"
href="https://github.com/avocado-framework/avocado-vt/pull/1463"
target="_blank" moz-do-not-send="true">https://github.com/avocado-framework/avocado-vt/pull/1463</a>).<br>
</span></span></p>
<p>We can also get IP adresses by using the function
provided by qemu-guest-agent, it can work with both dhcp
and static network. But, for me, it is an "aggressive"
way as well.<br>
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<div>This method may not work when OS inside QEMU is under
test.<br>
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<div text="#000000" bgcolor="#FFFFFF"> Thanks,<br>
Xu </div>
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<pre class="m_-6802739582567604629moz-quote-pre">FIY, we're trying a different approach of getting guest information on
Avocado (not on Avocado-VT), by using the "cloudinit" feature when the
guest has support for it:
<a class="m_-6802739582567604629moz-txt-link-freetext" href="https://avocado-framework.readthedocs.io/en/64.0/api/utils/avocado.utils.html#module-avocado.utils.cloudinit" target="_blank" moz-do-not-send="true">https://avocado-framework.readthedocs.io/en/64.0/api/utils/avocado.utils.html#module-avocado.utils.cloudinit</a>
It's simplistic at the moment, but it's possible to check for the
instance id used, and get the IP address from the the "phone home" HTTP
connection.
Regards,
</pre>
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