Module query

Message handling for queries.

While queries appear to be like any other DNS message, they are in fact special: They have exactly one entry in their question section, empty answer and authority sections, and optionally an OPT and a TSIG record in the additional section. In addition, queries may need to be reused – if an upstream server won’t respond, another server needs to be asked. While the OPT and TSIG records may need to be changed, the question doesn’t and can be used again.

This module provides types that help with creating, using, and re-using queries. QueryBuilder allows to construct a query and add and remove an OPT record as needed. A complete message can be frozen into a QueryMessage that can be given to the transport for sending. It can later be unfrozen back into a QueryBuilder for manipulations.

Structs

DgramQueryMessage

A raw query message for use with datagram transports.

OptBuilder

A builder for the OPT record of a query.

QueryBuilder

Builds a query DNS message.

QueryMessage

A DNS query message.

StreamQueryMessage

A raw query message for use with stream transports.