5237ffdf2b
Previously, sd-resolved unnecessarily requested SOA records for each dns label in the query, even though they are not needed for the chain of trust. Since47690634f1, only the necessary records are queried when validating. This is actually a problem in allow-downgrade mode, since we will no longer attempt a query for a record that we know is signed a priori, and will therefore never update our belief about the state of dnssec support in the recursive resolver. Rectify this by reintroducing a query for the root zone SOA in the allow-downgrade case, specifically to test that the resolver attaches the RRSIGs which we know must exist. Fixes:47690634f1("resolved: don't request the SOA for every dns label")
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