ufo

README

ufo

Listening on TCP port 0 makes the system allocate a random port for you.

...
  ln, err := net.Listen("tcp", ":0")
  if err != nil {
          return err
  }
  log.Println("listening on", ln.Addr().String())
  return http.Serve(ln, http.FileServer(http.Dir(".")))
...

2022/09/24 23:09:17 listening on ::48982

Taking inspiration from that, ufo is a Golang service that allocates random subdomains to clients with automatic SSL, HTTP/3 for free.

The programming interface is the almost the same as [net.Listen]

...
  ln, err := ufo.Listen("https://ufo.k0s.io")
  if err != nil {
          return err
  }
  log.Println("listening on", ln.AutoURL())
  return http.Serve(ln, http.FileServer(http.Dir(".")))
...

2022/09/24 23:09:17 listening on https://1.ufo.k0s.io

deploy server:

$ kubectl apply -f https://raw.githubusercontent.com/btwiuse/ufo/main/deploy.yaml

install client:

$ go install github.com/btwiuse/ufo/cmd/ufo@latest

example apps:

$ ufo hello
$ ufo gos
$ ufo sse
$ ufo echo

TODO

• support concurrent rw on session manager map
• support custom root domain, for example HOST=ufo.dev
• support user specified hostname
• authentication plugins: netrc, basic auth, environment variable
• reverseproxy WebTransport requests

Documentation

Index

• Constants
• func Dial(ctx context.Context, u *url.URL, hdr http.Header) (*webtransport.Session, error)
• func ExtractAltSvcEndpoints(h http.Header, protocolId string) []string
• func ExtractURLPort(u *url.URL) string
• func Graft(base, alt string) string
• func Listen(u string) (*listener, error)
• func Serve(u string, handler http.Handler) error
• func ToIdna(s string) string
• type StreamConn
  • func (sc *StreamConn) LocalAddr() net.Addr
  • func (sc *StreamConn) RemoteAddr() net.Addr

Constants

const MaxIncomingStreams int64 = 1 << 60

2^60 == 1152921504606846976

Functions

func Dial

func Dial(ctx context.Context, u *url.URL, hdr http.Header) (*webtransport.Session, error)

Dial is a wrapper around webtransport.Dial with automatic HTTP/3 service discovery

func ExtractAltSvcEndpoints

func ExtractAltSvcEndpoints(h http.Header, protocolId string) []string

ExtractAltSvcH3Endpoints reads Alt-Svc header returns a list of [host]:port endpoints

func ExtractURLPort

func ExtractURLPort(u *url.URL) string

ExtractURLPort returns the :port part from URL.Host (host[:port])

An empty string is returned if no port is found

func Graft

func Graft(base, alt string) string

Graft returns Host(base):Port(alt)

assuming - base is host[:port] - alt is [host]:port

func Listen

func Listen(u string) (*listener, error)

func Serve

func Serve(u string, handler http.Handler) error

func ToIdna

func ToIdna(s string) string

ToIdna converts a string to its idna form at best effort Should only be used on the hostname part without port

Types

type StreamConn

type StreamConn struct {
	webtransport.Stream
	Session *webtransport.Session
}

StreamsConn wraps webtransport.Stream into net.Conn

func (*StreamConn) LocalAddr

func (sc *StreamConn) LocalAddr() net.Addr

LocalAddr is required to impl net.Conn

func (*StreamConn) RemoteAddr

func (sc *StreamConn) RemoteAddr() net.Addr

RemoteAddr is required to impl net.Conn