While the TCP query to Google DNS before provided more robust DNS services,
it could still leak outside the VPN service based on platform version
and other circumstances. By using PDNSD as a proxy back into Tor's limited DNS
service, we ensure DNS does not leak.
Tor's DNS port doesn't work well with the VPN mode, so we
will use PDSND to resolve DNS over Tor using OpenDNS. This is
a hack/solution that we learned from SocksDroid.