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using MediaBrowser.Common.Events;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Dlna;
using MediaBrowser.Model.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Net;
namespace MediaBrowser.Dlna.Ssdp
{
public class DeviceDiscovery : IDeviceDiscovery, IDisposable
{
private bool _disposed;
private readonly ILogger _logger;
private readonly IServerConfigurationManager _config;
private SsdpHandler _ssdpHandler;
private readonly CancellationTokenSource _tokenSource;
private readonly IServerApplicationHost _appHost;
public event EventHandler<SsdpMessageEventArgs> DeviceDiscovered;
public event EventHandler<SsdpMessageEventArgs> DeviceLeft;
private readonly INetworkManager _networkManager;
public DeviceDiscovery(ILogger logger, IServerConfigurationManager config, IServerApplicationHost appHost, INetworkManager networkManager)
{
_tokenSource = new CancellationTokenSource();
_logger = logger;
_config = config;
_appHost = appHost;
_networkManager = networkManager;
}
private List<IPAddress> GetLocalIpAddresses()
{
return _networkManager.GetLocalIpAddresses().ToList();
}
public void Start(SsdpHandler ssdpHandler)
{
_ssdpHandler = ssdpHandler;
_ssdpHandler.MessageReceived += _ssdpHandler_MessageReceived;
foreach (var localIp in GetLocalIpAddresses())
{
try
{
CreateListener(localIp);
}
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
{
if (e.LocalEndPoint == null)
{
var ip = _appHost.LocalIpAddresses.FirstOrDefault(i => !IPAddress.IsLoopback(i));
if (ip != null)
{
e.LocalEndPoint = new IPEndPoint(ip, 0);
}
}
if (e.LocalEndPoint != null)
{
TryCreateDevice(e);
}
}
catch (OperationCanceledException)
{
}
catch (Exception ex)
{
_logger.ErrorException("Error creating play to controller", ex);
}
}
private void CreateListener(IPAddress localIp)
{
Task.Factory.StartNew(async (o) =>
{
try
{
_logger.Info("Creating SSDP listener on {0}", localIp);
var endPoint = new IPEndPoint(localIp, 1900);
var socket = GetMulticastSocket(localIp, endPoint);
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.LocalEndPoint = new IPEndPoint(localIp, 0);
if (_ssdpHandler.IgnoreMessage(args, true))
{
return;
}
_ssdpHandler.LogMessageReceived(args, true);
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(IPAddress localIpAddress, EndPoint localEndpoint)
{
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"), localIpAddress));
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 4);
socket.Bind(localEndpoint);
return socket;
}
private void TryCreateDevice(SsdpMessageEventArgs args)
{
string nts;
args.Headers.TryGetValue("NTS", out nts);
if (String.Equals(nts, "ssdp:byebye", StringComparison.OrdinalIgnoreCase))
{
if (String.Equals(args.Method, "NOTIFY", StringComparison.OrdinalIgnoreCase))
{
if (!_disposed)
{
EventHelper.FireEventIfNotNull(DeviceLeft, this, args, _logger);
}
}
return;
}
string usn;
if (!args.Headers.TryGetValue("USN", out usn)) usn = string.Empty;
string nt;
if (!args.Headers.TryGetValue("NT", out nt)) nt = string.Empty;
// Need to be able to download device description
string location;
if (!args.Headers.TryGetValue("Location", out location) ||
string.IsNullOrEmpty(location))
{
return;
}
EventHelper.FireEventIfNotNull(DeviceDiscovered, this, args, _logger);
}
public void Dispose()
{
if (_ssdpHandler != null)
{
_ssdpHandler.MessageReceived -= _ssdpHandler_MessageReceived;
}
if (!_disposed)
{
_disposed = true;
_tokenSource.Cancel();
}
}
}
}
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