Update dependencies

vendor/github.com/tailscale/goupnp/httpu/httpu.go

@@ -0,0 +1,164 @@
+package httpu
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+)
+
+// ClientInterface is the general interface provided to perform HTTP-over-UDP
+// requests.
+type ClientInterface interface {
+	io.Closer
+	// Do performs a request. The timeout is how long to wait for before returning
+	// the responses that were received. An error is only returned for failing to
+	// send the request. Failures in receipt simply do not add to the resulting
+	// responses.
+	Do(req *http.Request, numSends int) ([]*http.Response, error)
+}
+
+// HTTPUClient is a client for dealing with HTTPU (HTTP over UDP). Its typical
+// function is for HTTPMU, and particularly SSDP.
+type HTTPUClient struct {
+	connLock sync.Mutex // Protects use of conn.
+	conn     net.PacketConn
+}
+
+var _ ClientInterface = &HTTPUClient{}
+
+// NewHTTPUClient creates a new HTTPUClient, opening up a new UDP socket for the
+// purpose.
+func NewHTTPUClient() (*HTTPUClient, error) {
+	conn, err := net.ListenPacket("udp", ":0")
+	if err != nil {
+		return nil, err
+	}
+	return &HTTPUClient{conn: conn}, nil
+}
+
+// NewHTTPUClientAddr creates a new HTTPUClient which will broadcast packets
+// from the specified address, opening up a new UDP socket for the purpose
+func NewHTTPUClientAddr(addr string) (*HTTPUClient, error) {
+	ip := net.ParseIP(addr)
+	if ip == nil {
+		return nil, errors.New("Invalid listening address")
+	}
+	conn, err := net.ListenPacket("udp", ip.String()+":0")
+	if err != nil {
+		return nil, err
+	}
+	return &HTTPUClient{conn: conn}, nil
+}
+
+// Close shuts down the client. The client will no longer be useful following
+// this.
+func (httpu *HTTPUClient) Close() error {
+	httpu.connLock.Lock()
+	defer httpu.connLock.Unlock()
+	return httpu.conn.Close()
+}
+
+// Do implements ClientInterface.Do.
+//
+// Note that at present only one concurrent connection will happen per
+// HTTPUClient.
+func (httpu *HTTPUClient) Do(
+	req *http.Request,
+	numSends int,
+) ([]*http.Response, error) {
+	httpu.connLock.Lock()
+	defer httpu.connLock.Unlock()
+
+	// Create the request. This is a subset of what http.Request.Write does
+	// deliberately to avoid creating extra fields which may confuse some
+	// devices.
+	var requestBuf bytes.Buffer
+	method := req.Method
+	if method == "" {
+		method = "GET"
+	}
+	if _, err := fmt.Fprintf(&requestBuf, "%s %s HTTP/1.1\r\n", method, req.URL.RequestURI()); err != nil {
+		return nil, err
+	}
+	if err := req.Header.Write(&requestBuf); err != nil {
+		return nil, err
+	}
+	if _, err := requestBuf.Write([]byte{'\r', '\n'}); err != nil {
+		return nil, err
+	}
+
+	destAddr, err := net.ResolveUDPAddr("udp", req.Host)
+	if err != nil {
+		return nil, err
+	}
+	ctx := req.Context()
+	deadline, ok := ctx.Deadline()
+	if !ok {
+		deadline = time.Now().Add(2 * time.Second)
+	}
+	returned := make(chan struct{})
+	defer close(returned)
+
+	go func() {
+		select {
+		case <-ctx.Done():
+			// if context is cancelled, stop any connections by setting time in the past.
+			httpu.conn.SetDeadline(time.Now().Add(-time.Second))
+		case <-returned:
+		}
+	}()
+	if err = httpu.conn.SetDeadline(deadline); err != nil {
+		return nil, err
+	}
+
+	// Send request.
+	for i := 0; i < numSends; i++ {
+		if n, err := httpu.conn.WriteTo(requestBuf.Bytes(), destAddr); err != nil {
+			return nil, err
+		} else if n < len(requestBuf.Bytes()) {
+			return nil, fmt.Errorf("httpu: wrote %d bytes rather than full %d in request",
+				n, len(requestBuf.Bytes()))
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+
+	// Await responses until timeout.
+	var responses []*http.Response
+	responseBytes := make([]byte, 2048)
+	for {
+		// 2048 bytes should be sufficient for most networks.
+		n, _, err := httpu.conn.ReadFrom(responseBytes)
+		if err != nil {
+			if err, ok := err.(net.Error); ok {
+				if err.Timeout() {
+					break
+				}
+				if err.Temporary() {
+					// Sleep in case this is a persistent error to avoid pegging CPU until deadline.
+					time.Sleep(10 * time.Millisecond)
+					continue
+				}
+			}
+			return nil, err
+		}
+
+		// Parse response.
+		response, err := http.ReadResponse(bufio.NewReader(bytes.NewBuffer(responseBytes[:n])), req)
+		if err != nil {
+			log.Printf("httpu: error while parsing response: %v", err)
+			continue
+		}
+
+		responses = append(responses, response)
+	}
+
+	// Timeout reached - return discovered responses.
+	return responses, nil
+}

vendor/github.com/tailscale/goupnp/httpu/multiclient.go

@@ -0,0 +1,72 @@
+package httpu
+
+import (
+	"net/http"
+
+	"golang.org/x/sync/errgroup"
+)
+
+// MultiClient dispatches requests out to all the delegated clients.
+type MultiClient struct {
+	// The HTTPU clients to delegate to.
+	delegates []ClientInterface
+}
+
+var _ ClientInterface = &MultiClient{}
+
+// NewMultiClient creates a new MultiClient that delegates to all the given
+// clients.
+func NewMultiClient(delegates []ClientInterface) *MultiClient {
+	return &MultiClient{delegates: delegates}
+}
+
+func (mc *MultiClient) Close() error {
+	for _, d := range mc.delegates {
+		d.Close()
+	}
+	return nil
+}
+
+// Do implements ClientInterface.Do.
+func (mc *MultiClient) Do(
+	req *http.Request,
+	numSends int,
+) ([]*http.Response, error) {
+	tasks := &errgroup.Group{}
+
+	results := make(chan []*http.Response)
+	tasks.Go(func() error {
+		defer close(results)
+		return mc.sendRequests(results, req, numSends)
+	})
+
+	var responses []*http.Response
+	tasks.Go(func() error {
+		for rs := range results {
+			responses = append(responses, rs...)
+		}
+		return nil
+	})
+
+	return responses, tasks.Wait()
+}
+
+func (mc *MultiClient) sendRequests(
+	results chan<- []*http.Response,
+	req *http.Request,
+	numSends int,
+) error {
+	tasks := &errgroup.Group{}
+	for _, d := range mc.delegates {
+		d := d // copy for closure
+		tasks.Go(func() error {
+			responses, err := d.Do(req, numSends)
+			if err != nil {
+				return err
+			}
+			results <- responses
+			return nil
+		})
+	}
+	return tasks.Wait()
+}

vendor/github.com/tailscale/goupnp/httpu/serve.go

@@ -0,0 +1,108 @@
+package httpu
+
+import (
+	"bufio"
+	"bytes"
+	"log"
+	"net"
+	"net/http"
+	"regexp"
+)
+
+const (
+	DefaultMaxMessageBytes = 2048
+)
+
+var (
+	trailingWhitespaceRx = regexp.MustCompile(" +\r\n")
+	crlf                 = []byte("\r\n")
+)
+
+// Handler is the interface by which received HTTPU messages are passed to
+// handling code.
+type Handler interface {
+	// ServeMessage is called for each HTTPU message received. peerAddr contains
+	// the address that the message was received from.
+	ServeMessage(r *http.Request)
+}
+
+// HandlerFunc is a function-to-Handler adapter.
+type HandlerFunc func(r *http.Request)
+
+func (f HandlerFunc) ServeMessage(r *http.Request) {
+	f(r)
+}
+
+// A Server defines parameters for running an HTTPU server.
+type Server struct {
+	Addr            string         // UDP address to listen on
+	Multicast       bool           // Should listen for multicast?
+	Interface       *net.Interface // Network interface to listen on for multicast, nil for default multicast interface
+	Handler         Handler        // handler to invoke
+	MaxMessageBytes int            // maximum number of bytes to read from a packet, DefaultMaxMessageBytes if 0
+}
+
+// ListenAndServe listens on the UDP network address srv.Addr. If srv.Multicast
+// is true, then a multicast UDP listener will be used on srv.Interface (or
+// default interface if nil).
+func (srv *Server) ListenAndServe() error {
+	var err error
+
+	var addr *net.UDPAddr
+	if addr, err = net.ResolveUDPAddr("udp", srv.Addr); err != nil {
+		log.Fatal(err)
+	}
+
+	var conn net.PacketConn
+	if srv.Multicast {
+		if conn, err = net.ListenMulticastUDP("udp", srv.Interface, addr); err != nil {
+			return err
+		}
+	} else {
+		if conn, err = net.ListenUDP("udp", addr); err != nil {
+			return err
+		}
+	}
+
+	return srv.Serve(conn)
+}
+
+// Serve messages received on the given packet listener to the srv.Handler.
+func (srv *Server) Serve(l net.PacketConn) error {
+	maxMessageBytes := DefaultMaxMessageBytes
+	if srv.MaxMessageBytes != 0 {
+		maxMessageBytes = srv.MaxMessageBytes
+	}
+	for {
+		buf := make([]byte, maxMessageBytes)
+		n, peerAddr, err := l.ReadFrom(buf)
+		if err != nil {
+			return err
+		}
+		buf = buf[:n]
+
+		go func(buf []byte, peerAddr net.Addr) {
+			// At least one router's UPnP implementation has added a trailing space
+			// after "HTTP/1.1" - trim it.
+			buf = trailingWhitespaceRx.ReplaceAllLiteral(buf, crlf)
+
+			req, err := http.ReadRequest(bufio.NewReader(bytes.NewBuffer(buf)))
+			if err != nil {
+				log.Printf("httpu: Failed to parse request: %v", err)
+				return
+			}
+			req.RemoteAddr = peerAddr.String()
+			srv.Handler.ServeMessage(req)
+			// No need to call req.Body.Close - underlying reader is bytes.Buffer.
+		}(buf, peerAddr)
+	}
+}
+
+// Serve messages received on the given packet listener to the given handler.
+func Serve(l net.PacketConn, handler Handler) error {
+	srv := Server{
+		Handler:         handler,
+		MaxMessageBytes: DefaultMaxMessageBytes,
+	}
+	return srv.Serve(l)
+}