using MediaBrowser.Common.Events; using MediaBrowser.Common.Net; using MediaBrowser.Controller.Configuration; using MediaBrowser.Model.Logging; using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Net.NetworkInformation; using System.Net.Sockets; using System.Threading; using System.Threading.Tasks; namespace MediaBrowser.Dlna.Ssdp { public class DeviceDiscovery : IDisposable { private bool _disposed; private readonly ILogger _logger; private readonly IServerConfigurationManager _config; private readonly SsdpHandler _ssdpHandler; private readonly CancellationTokenSource _tokenSource; private readonly IHttpClient _httpClient; private readonly INetworkManager _networkManager; public event EventHandler DeviceDiscovered; public event EventHandler DeviceLeft; public DeviceDiscovery(ILogger logger, IServerConfigurationManager config, IHttpClient httpClient, SsdpHandler ssdpHandler, INetworkManager networkManager) { _tokenSource = new CancellationTokenSource(); _logger = logger; _config = config; _httpClient = httpClient; _ssdpHandler = ssdpHandler; _networkManager = networkManager; } public void Start() { _ssdpHandler.MessageReceived += _ssdpHandler_MessageReceived; foreach (var network in GetNetworkInterfaces()) { _logger.Debug("Found interface: {0}. Type: {1}. Status: {2}", network.Name, network.NetworkInterfaceType, network.OperationalStatus); if (!network.SupportsMulticast || OperationalStatus.Up != network.OperationalStatus || !network.GetIPProperties().MulticastAddresses.Any()) continue; var ipV4 = network.GetIPProperties().GetIPv4Properties(); if (null == ipV4) continue; var localIp = network.GetIPProperties().UnicastAddresses .Where(i => i.Address.AddressFamily == AddressFamily.InterNetwork) .Select(i => i.Address) .FirstOrDefault(); if (localIp != null) { try { CreateListener(localIp, ipV4.Index); } catch (Exception e) { _logger.ErrorException("Failed to Initilize Socket", e); } } } } void _ssdpHandler_MessageReceived(object sender, SsdpMessageEventArgs e) { string nts; e.Headers.TryGetValue("NTS", out nts); if (String.Equals(e.Method, "NOTIFY", StringComparison.OrdinalIgnoreCase) && String.Equals(nts, "ssdp:byebye", StringComparison.OrdinalIgnoreCase) && !_disposed) { EventHelper.FireEventIfNotNull(DeviceLeft, this, e, _logger); return; } try { var ip = _networkManager.GetLocalIpAddresses().FirstOrDefault(); if (ip != null) { e.LocalIp = IPAddress.Parse(ip); TryCreateDevice(e); } } catch (OperationCanceledException) { } catch (Exception ex) { _logger.ErrorException("Error creating play to controller", ex); } } private IEnumerable GetNetworkInterfaces() { try { return NetworkInterface.GetAllNetworkInterfaces(); } catch (Exception ex) { _logger.ErrorException("Error in GetAllNetworkInterfaces", ex); return new List(); } } private void CreateListener(IPAddress localIp, int networkInterfaceIndex) { Task.Factory.StartNew(async (o) => { try { var socket = GetMulticastSocket(networkInterfaceIndex); var endPoint = new IPEndPoint(localIp, 1900); socket.Bind(endPoint); _logger.Info("Creating SSDP listener on {0}, network interface index {1}", localIp, networkInterfaceIndex); var receiveBuffer = new byte[64000]; CreateNotifier(localIp); while (!_tokenSource.IsCancellationRequested) { var receivedBytes = await socket.ReceiveAsync(receiveBuffer, 0, 64000); if (receivedBytes > 0) { var args = SsdpHelper.ParseSsdpResponse(receiveBuffer); args.EndPoint = endPoint; args.LocalIp = localIp; TryCreateDevice(args); } } _logger.Info("SSDP listener - Task completed"); } catch (OperationCanceledException) { } catch (Exception e) { _logger.ErrorException("Error in listener", e); } }, _tokenSource.Token, TaskCreationOptions.LongRunning); } private void CreateNotifier(IPAddress localIp) { Task.Factory.StartNew(async (o) => { try { while (true) { _ssdpHandler.SendSearchMessage(new IPEndPoint(localIp, 1900)); var delay = _config.GetDlnaConfiguration().ClientDiscoveryIntervalSeconds * 1000; await Task.Delay(delay, _tokenSource.Token).ConfigureAwait(false); } } catch (OperationCanceledException) { } catch (Exception ex) { _logger.ErrorException("Error in notifier", ex); } }, _tokenSource.Token, TaskCreationOptions.LongRunning); } private Socket GetMulticastSocket(int networkInterfaceIndex) { var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("239.255.255.250"), networkInterfaceIndex)); socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 4); return socket; } private void TryCreateDevice(SsdpMessageEventArgs args) { string nts; args.Headers.TryGetValue("NTS", out nts); string usn; if (!args.Headers.TryGetValue("USN", out usn)) usn = string.Empty; string nt; if (!args.Headers.TryGetValue("NT", out nt)) nt = string.Empty; // Ignore when a device is indicating it's shutting down if (string.Equals(nts, "ssdp:byebye", StringComparison.OrdinalIgnoreCase)) { return; } // Need to be able to download device description string location; if (!args.Headers.TryGetValue("Location", out location) || string.IsNullOrEmpty(location)) { return; } if (_config.GetDlnaConfiguration().EnableDebugLogging) { var headerTexts = args.Headers.Select(i => string.Format("{0}={1}", i.Key, i.Value)); var headerText = string.Join(",", headerTexts.ToArray()); _logger.Debug("{0} Device message received from {1}. Headers: {2}", args.Method, args.EndPoint, headerText); } EventHelper.FireEventIfNotNull(DeviceDiscovered, this, args, _logger); } public void Dispose() { _ssdpHandler.MessageReceived -= _ssdpHandler_MessageReceived; if (!_disposed) { _disposed = true; _tokenSource.Cancel(); } } } }