jellyfin/MediaBrowser.Dlna/Ssdp/DeviceDiscovery.cs
2014-09-06 00:21:23 -04:00

248 lines
8.5 KiB
C#

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<SsdpMessageEventArgs> DeviceDiscovered;
public event EventHandler<SsdpMessageEventArgs> 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<NetworkInterface> GetNetworkInterfaces()
{
try
{
return NetworkInterface.GetAllNetworkInterfaces();
}
catch (Exception ex)
{
_logger.ErrorException("Error in GetAllNetworkInterfaces", ex);
return new List<NetworkInterface>();
}
}
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();
}
}
}
}