NewCnameResolver resturns a new restriction resolver.

NewMetricsResolver creates a new intance of the MetricsResolver type.

nolint:funlen.

checks request's question (domain name) against black and white lists.

caches answers from dns queries with their TTL time, to avoid external resolver calls for recurrent queries.

ClientNamesResolver tries to determine client name by asking responsible DNS server vie rDNS (reverse lookup).

ConditionalUpstreamResolver delegates DNS question to other DNS resolver dependent on domain name in question.

CustomDNSResolver resolves passed domain name to ip address defined in domain-IP map.

MetricsResolver resolver that records metrics about requests/response.

ParallelBestResolver delegates the DNS message to 2 upstream resolvers and returns the fastest answer.

QueryLoggingResolver writes query information (question, answer, duration, ...) into log file or as log entry (if log directory is not configured).

UpstreamResolver sends request to external DNS server.