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server/vendor/github.com/pion/ice/v2/mdns.go

@@ -0,0 +1,65 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package ice
+
+import (
+	"github.com/google/uuid"
+	"github.com/pion/logging"
+	"github.com/pion/mdns"
+	"github.com/pion/transport/v2"
+	"golang.org/x/net/ipv4"
+)
+
+// MulticastDNSMode represents the different Multicast modes ICE can run in
+type MulticastDNSMode byte
+
+// MulticastDNSMode enum
+const (
+	// MulticastDNSModeDisabled means remote mDNS candidates will be discarded, and local host candidates will use IPs
+	MulticastDNSModeDisabled MulticastDNSMode = iota + 1
+
+	// MulticastDNSModeQueryOnly means remote mDNS candidates will be accepted, and local host candidates will use IPs
+	MulticastDNSModeQueryOnly
+
+	// MulticastDNSModeQueryAndGather means remote mDNS candidates will be accepted, and local host candidates will use mDNS
+	MulticastDNSModeQueryAndGather
+)
+
+func generateMulticastDNSName() (string, error) {
+	// https://tools.ietf.org/id/draft-ietf-rtcweb-mdns-ice-candidates-02.html#gathering
+	// The unique name MUST consist of a version 4 UUID as defined in [RFC4122], followed by “.local”.
+	u, err := uuid.NewRandom()
+	return u.String() + ".local", err
+}
+
+func createMulticastDNS(n transport.Net, mDNSMode MulticastDNSMode, mDNSName string, log logging.LeveledLogger) (*mdns.Conn, MulticastDNSMode, error) {
+	if mDNSMode == MulticastDNSModeDisabled {
+		return nil, mDNSMode, nil
+	}
+
+	addr, mdnsErr := n.ResolveUDPAddr("udp4", mdns.DefaultAddress)
+	if mdnsErr != nil {
+		return nil, mDNSMode, mdnsErr
+	}
+
+	l, mdnsErr := n.ListenUDP("udp4", addr)
+	if mdnsErr != nil {
+		// If ICE fails to start MulticastDNS server just warn the user and continue
+		log.Errorf("Failed to enable mDNS, continuing in mDNS disabled mode: (%s)", mdnsErr)
+		return nil, MulticastDNSModeDisabled, nil
+	}
+
+	switch mDNSMode {
+	case MulticastDNSModeQueryOnly:
+		conn, err := mdns.Server(ipv4.NewPacketConn(l), &mdns.Config{})
+		return conn, mDNSMode, err
+	case MulticastDNSModeQueryAndGather:
+		conn, err := mdns.Server(ipv4.NewPacketConn(l), &mdns.Config{
+			LocalNames: []string{mDNSName},
+		})
+		return conn, mDNSMode, err
+	default:
+		return nil, mDNSMode, nil
+	}
+}