ср, 12 сент. 2018 г. в 12:09, Xu Han <[email protected]>: > > On 9/12/18 7:58 AM, Cleber Rosa wrote: > > On 9/11/18 5:43 AM, Sergey Bronnikov wrote: > > 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 > > 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. > > 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. > > 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. > 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.
> Xu has written the tshak backend, so I bet he knows more about it. > > 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 the right informaion (see > https://github.com/avocado-framework/avocado-vt/pull/1463). > > 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. > This method may not work when OS inside QEMU is under test. > Thanks, > Xu > > > 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: > https://avocado-framework.readthedocs.io/en/64.0/api/utils/avocado.utils.html#module-avocado.utils.cloudinit > > 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, > > >
