dnsserver

type Config struct {
	Addr  string // Defaults to ":dns"
	NoTCP bool
	NoUDP bool

	ErrorLog Logger // Defaults to log package's standard logger
	DebugLog Logger // Defaults to nothingness

	// If provided, this channel will be closed once all listeners are ready.
	Ready chan struct{}

	// If the NS field of SOA is set, the name server will be authoritative and
	// NS and SOA records are returned.
	SOA SOA
}

type Logger interface {
	Printf(fmt string, args ...interface{})
}

type Resolver interface {
	// ResolveRecords copies a host's records.  It should return empty node
	// name if and only if the host name doesn't fall into any known zone:
	// unknown node names in known zones should be returned without records.
	//
	// The filter parameter selects a single record type, or all records if
	// dns.TypeAny is specified.  Unknown values must be handled by returning
	// an empty record set.
	//
	// serial is the current serial number of the node's zone.  It is non-zero
	// for known zones, and zero if zone wasn't found.
	ResolveRecords(hostname string, filter dns.RecordType) (node string, rs dns.Records, serial uint32)

	// TransferZone copies the contents of a domain.  The apex node must be
	// first, if present.
	//
	// serial is the current serial number of the zone.  It is non-zero if the
	// zone was found, and zero if not.
	TransferZone(domain string) (zone []dns.NodeRecords, serial uint32)
}

type SOA struct {
	NS   string // Name of this name server (like "ns1.example.net.")
	Mbox string // Email mailbox (like "hostmaster.example.net.")

	Refresh uint32 // Defaults to a reasonable value
	Retry   uint32 // Defaults to a reasonable value
	Expire  uint32 // Defaults to a reasonable value
	TTL     uint32 // Defaults to a reasonable value
}