DefaultHostsPaths returns the slice of default paths to system hosts files.

ListenConfig returns the default [net.ListenConfig] used by the plain-DNS servers in this module.

ParseSubnet parses s either as a CIDR prefix itself, or as an IP address, returning the corresponding single-IP CIDR prefix.

UDPGetOOBSize returns maximum size of the received OOB data.

UDPRead reads the message from conn using buf and receives a control-message payload of size udpOOBSize from it.

UDPSetOptions sets flag options on a UDP socket to be able to receive the necessary OOB data.

UDPWrite writes the data to the remoteAddr using conn.