resolved: add a concept of "authenticated" responses

This adds a new SD_RESOLVED_AUTHENTICATED flag for responses we return
on the bus. When set, then the data has been authenticated. For now this
mostly reflects the DNSSEC AD bit, if DNSSEC=trust is set. As soon as
the client-side validation is complete it will be hooked up to this flag
too.

We also set this bit whenver we generated the data ourselves, for
example, because it originates in our local LLMNR zone, or from the
built-in trust anchor database.

The "systemd-resolve-host" tool has been updated to show the flag state
for the data it shows.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h
index 9a2662ec0e..a3058ce6e8 100644
--- a/src/resolve/resolved-dns-transaction.h
+++ b/src/resolve/resolved-dns-transaction.h
@@ -69,6 +69,7 @@ struct DnsTransaction {
         DnsAnswer *answer;
         int answer_rcode;
         DnsTransactionSource answer_source;
+        bool answer_authenticated;
 
         usec_t start_usec;
         sd_event_source *timeout_event_source;