(webrtc) added support for ice mux tcp and nat1to1ips (#1323)

* add webrtcp static tcp mux port

* add ice nat1 host configuration and cleanup

* typo

* rename config keys

* apply codecov suggestions

* apply review suggestions

* typo

* dont use deepequal for WebRTCICETCPMuxAddress

* unexport NewPeerConnection()

* remove Dockerfile

* use an empty list instead of nil value in webrtcICEHostNAT1To1IPs

* drop webrtcICETCPMuxEnable and enable TCP mux when webrtcICETCPMuxAddress is filled

* run go mod tidy

Co-authored-by: aler9 <46489434+aler9@users.noreply.github.com>

apidocs/openapi.yaml

@@ -147,6 +147,12 @@ components:
           type: array
           items:
             type: string
+        webrtcICEHostNAT1To1IPs:
+          type: array
+          items:
+            type: string
+        webrtcICETCPMuxAddress:
+          type: string
 
         # paths
         paths:

go.mod

@@ -16,6 +16,8 @@ require (
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/notedit/rtmp v0.0.2
 	github.com/orcaman/writerseeker v0.0.0
+	github.com/pion/ice/v2 v2.2.11
+	github.com/pion/interceptor v0.1.11
 	github.com/pion/rtp v1.7.13
 	github.com/pion/webrtc/v3 v3.1.47
 	github.com/stretchr/testify v1.7.1
@@ -42,8 +44,6 @@ require (
 	github.com/pelletier/go-toml/v2 v2.0.1 // indirect
 	github.com/pion/datachannel v1.5.2 // indirect
 	github.com/pion/dtls/v2 v2.1.5 // indirect
-	github.com/pion/ice/v2 v2.2.11 // indirect
-	github.com/pion/interceptor v0.1.11 // indirect
 	github.com/pion/logging v0.2.2 // indirect
 	github.com/pion/mdns v0.0.5 // indirect
 	github.com/pion/randutil v0.1.0 // indirect

internal/conf/conf.go

@@ -232,6 +232,8 @@ type Conf struct {
 	WebRTCAllowOrigin       string     `json:"webrtcAllowOrigin"`
 	WebRTCTrustedProxies    IPsOrCIDRs `json:"webrtcTrustedProxies"`
 	WebRTCICEServers        []string   `json:"webrtcICEServers"`
+	WebRTCICEHostNAT1To1IPs []string   `json:"webrtcICEHostNAT1To1IPs"`
+	WebRTCICETCPMuxAddress  string     `json:"webrtcICETCPMuxAddress"`
 
 	// paths
 	Paths map[string]*PathConf `json:"paths"`

internal/core/core.go

@@ -413,6 +413,8 @@ func (p *Core) createResources(initial bool) error {
 				p.pathManager,
 				p.metrics,
 				p,
+				p.conf.WebRTCICEHostNAT1To1IPs,
+				p.conf.WebRTCICETCPMuxAddress,
 			)
 			if err != nil {
 				return err
@@ -574,7 +576,9 @@ func (p *Core) closeResources(newConf *conf.Conf, calledByAPI bool) {
 		!reflect.DeepEqual(newConf.WebRTCICEServers, p.conf.WebRTCICEServers) ||
 		newConf.ReadBufferCount != p.conf.ReadBufferCount ||
 		closeMetrics ||
-		closePathManager
+		closePathManager ||
+		!reflect.DeepEqual(newConf.WebRTCICEHostNAT1To1IPs, p.conf.WebRTCICEHostNAT1To1IPs) ||
+		newConf.WebRTCICETCPMuxAddress != p.conf.WebRTCICETCPMuxAddress
 
 	closeAPI := newConf == nil ||
 		newConf.API != p.conf.API ||

internal/core/webrtc_conn.go

@@ -24,6 +24,8 @@ import (
 	"github.com/aler9/gortsplib/v2/pkg/ringbuffer"
 	"github.com/google/uuid"
 	"github.com/gorilla/websocket"
+	"github.com/pion/ice/v2"
+	"github.com/pion/interceptor"
 	"github.com/pion/webrtc/v3"
 
 	"github.com/aler9/rtsp-simple-server/internal/conf"
@@ -34,6 +36,31 @@ const (
 	handshakeDeadline = 10 * time.Second
 )
 
+// newPeerConnection creates a PeerConnection with the default codecs and
+// interceptors.  See RegisterDefaultCodecs and RegisterDefaultInterceptors.
+//
+// This function is a copy of webrtc/peerconnection.go
+// unlike the original one, allows you to add additional custom options
+func newPeerConnection(configuration webrtc.Configuration,
+	options ...func(*webrtc.API),
+) (*webrtc.PeerConnection, error) {
+	m := &webrtc.MediaEngine{}
+	if err := m.RegisterDefaultCodecs(); err != nil {
+		return nil, err
+	}
+
+	i := &interceptor.Registry{}
+	if err := webrtc.RegisterDefaultInterceptors(m, i); err != nil {
+		return nil, err
+	}
+
+	options = append(options, webrtc.WithMediaEngine(m))
+	options = append(options, webrtc.WithInterceptorRegistry(i))
+
+	api := webrtc.NewAPI(options...)
+	return api.NewPeerConnection(configuration)
+}
+
 type webRTCTrack struct {
 	media       *media.Media
 	format      format.Format
@@ -68,6 +95,8 @@ type webRTCConn struct {
 	wg                *sync.WaitGroup
 	pathManager       webRTCConnPathManager
 	parent            webRTCConnParent
+	iceTCPMux         ice.TCPMux
+	iceHostNAT1To1IPs []string
 
 	ctx       context.Context
 	ctxCancel func()
@@ -86,6 +115,8 @@ func newWebRTCConn(
 	wg *sync.WaitGroup,
 	pathManager webRTCConnPathManager,
 	parent webRTCConnParent,
+	iceTCPMux ice.TCPMux,
+	iceHostNAT1To1IPs []string,
 ) *webRTCConn {
 	ctx, ctxCancel := context.WithCancel(parentCtx)
 
@@ -101,6 +132,8 @@ func newWebRTCConn(
 		ctxCancel:         ctxCancel,
 		uuid:              uuid.New(),
 		created:           time.Now(),
+		iceTCPMux:         iceTCPMux,
+		iceHostNAT1To1IPs: iceHostNAT1To1IPs,
 	}
 
 	c.log(logger.Info, "opened")
@@ -222,9 +255,19 @@ func (c *webRTCConn) runInner(ctx context.Context) error {
 		return err
 	}
 
-	pc, err := webrtc.NewPeerConnection(webrtc.Configuration{
+	configuration := webrtc.Configuration{ICEServers: c.genICEServers()}
-		ICEServers: c.genICEServers(),
+	settingsEngine := webrtc.SettingEngine{}
-	})
+
+	if c.iceTCPMux != nil {
+		settingsEngine.SetICETCPMux(c.iceTCPMux)
+		settingsEngine.SetNetworkTypes([]webrtc.NetworkType{webrtc.NetworkTypeTCP4})
+	}
+
+	if len(c.iceHostNAT1To1IPs) != 0 {
+		settingsEngine.SetNAT1To1IPs(c.iceHostNAT1To1IPs, webrtc.ICECandidateTypeHost)
+	}
+
+	pc, err := newPeerConnection(configuration, webrtc.WithSettingEngine(settingsEngine))
 	if err != nil {
 		return err
 	}

internal/core/webrtc_server.go

@@ -15,6 +15,8 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/gorilla/websocket"
+	"github.com/pion/ice/v2"
+	"github.com/pion/webrtc/v3"
 
 	"github.com/aler9/rtsp-simple-server/internal/conf"
 	"github.com/aler9/rtsp-simple-server/internal/logger"
@@ -81,9 +83,13 @@ type webRTCServer struct {
 	ctxCancel func()
 	wg        sync.WaitGroup
 	ln        net.Listener
+	tcpMuxLn  net.Listener
 	tlsConfig *tls.Config
 	conns     map[*webRTCConn]struct{}
 
+	iceTCPMux         ice.TCPMux
+	iceHostNAT1To1IPs []string
+
 	// in
 	connNew        chan webRTCConnNewReq
 	chConnClose    chan *webRTCConn
@@ -105,6 +111,8 @@ func newWebRTCServer(
 	pathManager *pathManager,
 	metrics *metrics,
 	parent webRTCServerParent,
+	iceHostNAT1To1IPs []string,
+	iceTCPMuxAddress string,
 ) (*webRTCServer, error) {
 	ln, err := net.Listen("tcp", address)
 	if err != nil {
@@ -124,6 +132,18 @@ func newWebRTCServer(
 		}
 	}
 
+	var iceTCPMux ice.TCPMux
+	var tcpMuxLn net.Listener
+	if iceTCPMuxAddress != "" {
+		tcpMuxLn, err = net.Listen("tcp", iceTCPMuxAddress)
+		if err != nil {
+			tcpMuxLn.Close()
+			return nil, err
+		}
+
+		iceTCPMux = webrtc.NewICETCPMux(nil, tcpMuxLn, 8)
+	}
+
 	ctx, ctxCancel := context.WithCancel(parentCtx)
 
 	s := &webRTCServer{
@@ -138,7 +158,10 @@ func newWebRTCServer(
 		ctx:                       ctx,
 		ctxCancel:                 ctxCancel,
 		ln:                        ln,
+		tcpMuxLn:                  tcpMuxLn,
 		tlsConfig:                 tlsConfig,
+		iceTCPMux:                 iceTCPMux,
+		iceHostNAT1To1IPs:         iceHostNAT1To1IPs,
 		conns:                     make(map[*webRTCConn]struct{}),
 		connNew:                   make(chan webRTCConnNewReq),
 		chConnClose:               make(chan *webRTCConn),
@@ -148,6 +171,10 @@ func newWebRTCServer(
 
 	s.log(logger.Info, "listener opened on "+address)
 
+	if tcpMuxLn != nil {
+		s.log(logger.Info, "ice mux tcp listener opened on "+iceTCPMuxAddress)
+	}
+
 	if s.metrics != nil {
 		s.metrics.webRTCServerSet(s)
 	}
@@ -206,6 +233,8 @@ outer:
 				&s.wg,
 				s.pathManager,
 				s,
+				s.iceTCPMux,
+				s.iceHostNAT1To1IPs,
 			)
 			s.conns[c] = struct{}{}
 
@@ -253,6 +282,11 @@ outer:
 	s.ctxCancel()
 
 	hs.Shutdown(context.Background())
+
+	if s.tcpMuxLn != nil {
+		s.tcpMuxLn.Close()
+	}
+
 	s.ln.Close() // in case Shutdown() is called before Serve()
 }
 

rtsp-simple-server.yml

@@ -196,6 +196,13 @@ webrtcTrustedProxies: []
 # if user is "AUTH_SECRET", then authentication is secret based.
 # the secret must be inserted into the pass field.
 webrtcICEServers: [stun:stun.l.google.com:19302]
+# List of public IP addresses that are to be used as a host.
+# This is used typically for servers that are behind 1:1 D-NAT.
+webrtcICEHostNAT1To1IPs: []
+# Address of a ICE TCP listener in format host:port.
+# If filled, ICE traffic will come through a single TCP port,
+# allowing the deployment of the server inside a container or behind a NAT.
+webrtcICETCPMuxAddress:
 
 ###############################################
 # Path parameters