mirror of
https://github.com/pi-hole/dnsmasq.git
synced 2025-12-19 10:18:25 +00:00
b6f926fbef
When a record is defined locally, eg an A record for one.two.example then we already know that if we forward, eg an AAAA query for one.two.example, and get back NXDOMAIN, then we need to alter that to NODATA. This is handled by check_for_local_domain(). But, if we forward two.example, because one.two.example exists, then the answer to two.example should also be a NODATA. For most local records this is easy, just to substring matching. for A, AAAA and CNAME records that are in the cache, it's more difficult. The cache has no efficient way to find such records. The fix is to insert empty (none of F_IPV4, F_IPV6 F_CNAME set) records for each non-terminal. The same considerations apply in auth mode, and the same basic mechanism is used there too.