dns_handler

Documentation

Index

• type DefaultHandler
  • func (h *DefaultHandler) ServeDNS(ctx context.Context, qCtx *handler.Context, w ResponseWriter)
• type DummyServerHandler
  • func (d *DummyServerHandler) ServeDNS(_ context.Context, qCtx *handler.Context, w ResponseWriter)
• type Handler
• type ResponseWriter

Types

type DefaultHandler

type DefaultHandler struct {
	// Logger is used for logging. A nil value will disable logging.
	Logger *zap.Logger

	// Entry is the entry ExecutablePlugin's tag. This cannot be nil.
	Entry handler.ExecutableChainNode

	// ConcurrentLimit controls the max concurrent queries for the DefaultHandler.
	// If ConcurrentLimit <= 0, means no limit.
	// When calling DefaultHandler.ServeDNS(), if a query exceeds the limit, it will wait on a FIFO queue until
	// - its ctx is done or currently there are more than 3 x ConcurrentLimit queries waiting -> The query will be dropped silently.
	// - it can be proceeded -> Normal procedure.
	ConcurrentLimit int

	// RecursionAvailable sets the dns.Msg.RecursionAvailable flag globally.
	RecursionAvailable bool
	// contains filtered or unexported fields
}

func (*DefaultHandler) ServeDNS

func (h *DefaultHandler) ServeDNS(ctx context.Context, qCtx *handler.Context, w ResponseWriter)

ServeDNS If entry returns an error, a SERVFAIL response will be sent back to client. If concurrentLimit is reached, the query will block and wait available token until ctx is done.

type DummyServerHandler

type DummyServerHandler struct {
	T       *testing.T
	WantMsg *dns.Msg
	WantErr error
}

func (*DummyServerHandler) ServeDNS

func (d *DummyServerHandler) ServeDNS(_ context.Context, qCtx *handler.Context, w ResponseWriter)

type Handler

type Handler interface {
	// ServeDNS uses ctx to control deadline, exchanges qCtx, and writes response to w.
	ServeDNS(ctx context.Context, qCtx *handler.Context, w ResponseWriter)
}

type ResponseWriter

type ResponseWriter interface {
	Write(m *dns.Msg) (n int, err error)
}

ResponseWriter can write msg to the client.