<div dir="ltr"><br><br><div class="gmail_quote"><div dir="ltr">ср, 12 сент. 2018 г. в 12:09, Xu Han <<a href="mailto:xuhan@redhat.com">xuhan@redhat.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF">
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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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</div><div text="#000000" bgcolor="#FFFFFF"><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>
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<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></div></blockquote><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></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF"><p>
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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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</div><div text="#000000" bgcolor="#FFFFFF"><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">https://github.com/avocado-framework/avocado-vt/pull/1463</a>).<br>
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<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></blockquote><div>This method may not work when OS inside QEMU is under test.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF">
Thanks,<br>
Xu
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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">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,
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