Store DNS responses for offline resolve

Unbound
1

Hi,

I was wondering whether libunbound/ldns allows to get access to all the DNS responses of a particular resolve request such that those responses can be stored to disk and later loaded up again such that an offline resolve function can be called.

Thanks,
Maik

2

unbound-control allows you to save and load the cache, so you can do it for a query on a fresh new cache. Not sure if you can really do it for a query using libunbound

3

if not, this is something 'dnstap' was designed to assist with.

4

Thanks for the pointer, though it seems like it's meant for continuous logging through an external daemon. I'm looking for something that's usable from a library. And ideally something supports the opposite direction as well, so taking the dumped responses and using it later to resolve and DNSSEC-validate a request offline.

5

That looks interesting. If I understood correctly, unbound-control sends messages to an unbound daemon, which in turn is based on libunbound. So if the daemon can dump and load a cache, I should be able to do the same myself somehow through the libunbound API, right?

6

Redis backend?