proxy

type HostResolver interface {
	LookupAddr(addr string) []string
	LookupHost(addr string) []string
}

type Proxy struct {
	// Addrs specifies the TCP/UDP address to listen to, :53 if empty.
	Addrs []string

	// LocalResolver is called before the upstream to resolve local hostnames or
	// IPs.
	LocalResolver HostResolver

	// Upstream specifies the resolver used for incoming queries.
	Upstream resolver.Resolver

	// DiscoveryResolver is called after the upstream if no result was found.
	DiscoveryResolver HostResolver

	// BogusPriv specifies that reverse lookup on private subnets are answerd
	// with NXDOMAIN.
	BogusPriv bool

	// Timeout defines the maximum allowed time allowed for a request before
	// being cancelled.
	Timeout time.Duration

	// Maximum number of inflight requests. Further requests will
	// not be answered.
	MaxInflightRequests uint

	// QueryLog specifies an optional log function called for each received query.
	QueryLog func(QueryInfo)

	// InfoLog specifies an option log function called when some actions are
	// performed.
	InfoLog func(string)

	// ErrorLog specifies an optional log function for errors. If not set,
	// errors are not reported.
	ErrorLog func(error)
}

type QueryInfo struct {
	Protocol          string
	Profile           string
	PeerIP            net.IP
	Type              string
	Name              string
	QuerySize         int
	ResponseSize      int
	Duration          time.Duration
	FromCache         bool
	UpstreamTransport string
	Error             error
}