[libvirt] [PATCH] Add support for DNS TXT records

[Michal Novotny]

[snip]
> Perhaps, you could implement (instead of tags for PTR, CNAME, etc.)
>
>    <dns>
>      <host ip="192.168.122.1">
>        <hostname>host1</hostname>
>        <hostname>host2</hostname>
>        <hostname>host3</hostname>
>      </host>
>    </dns>
>
> instead, which would write a file
>
>    192.168.122.1 host1 host2 host3
>
> and pass it to dnsmasq via --addn-hosts.  But every feature should be 
> added as a separate patch.
Paolo, I'm having interesting results on this matter. I was unable to
see it working now whereas I saw it working fine yesterday so I've been
investigating this further.

Results of my investigation were obtained when running it manually and
they are:

1) /usr/sbin/dnsmasq --strict-order --bind-interfaces
--pid-file=/var/run/libvirt/network/default.pid --conf-file=
--except-interface lo --txt-record="txt-record","some value, which is
something" --addn-hosts=/var/run/libvirt/network/default.hosts
--listen-address 192.168.122.1 --dhcp-range
192.168.122.2,192.168.122.254
--dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases
--dhcp-lease-max=253 --dhcp-no-override

-> the guest was unable to access the records from --addn-hosts (tested
using nslookup)

2) /usr/sbin/dnsmasq --strict-order --bind-interfaces
--pid-file=/var/run/libvirt/network/default.pid --conf-file=
--except-interface lo --txt-record="txt-record","some value, which is
something" --addn-hosts=/var/run/libvirt/network/default.hosts
--listen-address 192.168.122.1 --dhcp-range
192.168.122.2,192.168.122.254
--dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases
--dhcp-lease-max=253 --dhcp-no-override --no-daemon

-> the --no-daemon option made it working for the --addn-hosts but it
was not working without it, i.e. in the daemon mode. Based on this I
guess this is the bug in Fedora-14 DNSMasq (which is the same as the one
for Fedora-14 since I'm unable to get any update and the version I'm
having is dnsmasq-2.52-1.fc13.i686). Should I file a bug against DNSMasq
about this?

Also, I've been testing the --txt-record once again and not grabbed it
with wireshark and I had to query the "txt-record" TXT record for this
and the wireshark was showing the quotes there as well now. Should I
disable it then and use the working syntax for record name which
(according to my testing) is to use *--txt-record=txt-record,"some
value, which is something"* instead, i.e. to not use quotes in the name?

Thanks,
Michal

-- 
Michal Novotny <minovotn at redhat.com>, RHCE
Virtualization Team (xen userspace), Red Hat