561 lines
24 KiB
C#
561 lines
24 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Net.Http;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Net;
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using MediaBrowser.Model.Threading;
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using Rssdp;
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namespace Rssdp.Infrastructure
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{
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/// <summary>
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/// Provides the platform independent logic for publishing SSDP devices (notifications and search responses).
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/// </summary>
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public class SsdpDevicePublisher : DisposableManagedObjectBase, ISsdpDevicePublisher
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{
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private ISsdpCommunicationsServer _CommsServer;
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private string _OSName;
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private string _OSVersion;
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private bool _SupportPnpRootDevice;
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private IList<SsdpRootDevice> _Devices;
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private IReadOnlyList<SsdpRootDevice> _ReadOnlyDevices;
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private ITimer _RebroadcastAliveNotificationsTimer;
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private ITimerFactory _timerFactory;
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private IDictionary<string, SearchRequest> _RecentSearchRequests;
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private Random _Random;
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private const string ServerVersion = "1.0";
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/// <summary>
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/// Default constructor.
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/// </summary>
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public SsdpDevicePublisher(ISsdpCommunicationsServer communicationsServer, ITimerFactory timerFactory, string osName, string osVersion)
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{
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if (communicationsServer == null) throw new ArgumentNullException("communicationsServer");
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if (osName == null) throw new ArgumentNullException("osName");
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if (osName.Length == 0) throw new ArgumentException("osName cannot be an empty string.", "osName");
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if (osVersion == null) throw new ArgumentNullException("osVersion");
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if (osVersion.Length == 0) throw new ArgumentException("osVersion cannot be an empty string.", "osName");
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_SupportPnpRootDevice = true;
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_timerFactory = timerFactory;
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_Devices = new List<SsdpRootDevice>();
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_ReadOnlyDevices = new ReadOnlyCollection<SsdpRootDevice>(_Devices);
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_RecentSearchRequests = new Dictionary<string, SearchRequest>(StringComparer.OrdinalIgnoreCase);
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_Random = new Random();
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_CommsServer = communicationsServer;
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_CommsServer.RequestReceived += CommsServer_RequestReceived;
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_OSName = osName;
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_OSVersion = osVersion;
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_CommsServer.BeginListeningForBroadcasts();
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}
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public void StartBroadcastingAliveMessages(TimeSpan interval)
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{
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_RebroadcastAliveNotificationsTimer = _timerFactory.Create(SendAllAliveNotifications, null, TimeSpan.FromSeconds(5), interval);
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}
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/// <summary>
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/// Adds a device (and it's children) to the list of devices being published by this server, making them discoverable to SSDP clients.
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/// </summary>
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/// <remarks>
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/// <para>Adding a device causes "alive" notification messages to be sent immediately, or very soon after. Ensure your device/description service is running before adding the device object here.</para>
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/// <para>Devices added here with a non-zero cache life time will also have notifications broadcast periodically.</para>
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/// <para>This method ignores duplicate device adds (if the same device instance is added multiple times, the second and subsequent add calls do nothing).</para>
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/// </remarks>
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/// <param name="device">The <see cref="SsdpDevice"/> instance to add.</param>
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/// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="device"/> argument is null.</exception>
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/// <exception cref="System.InvalidOperationException">Thrown if the <paramref name="device"/> contains property values that are not acceptable to the UPnP 1.0 specification.</exception>
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1804:RemoveUnusedLocals", MessageId = "t", Justification = "Capture task to local variable supresses compiler warning, but task is not really needed.")]
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public void AddDevice(SsdpRootDevice device)
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{
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if (device == null) throw new ArgumentNullException("device");
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ThrowIfDisposed();
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TimeSpan minCacheTime = TimeSpan.Zero;
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bool wasAdded = false;
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lock (_Devices)
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{
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if (!_Devices.Contains(device))
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{
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_Devices.Add(device);
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wasAdded = true;
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minCacheTime = GetMinimumNonZeroCacheLifetime();
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}
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}
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if (wasAdded)
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{
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WriteTrace("Device Added", device);
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SendAliveNotifications(device, true, CancellationToken.None);
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}
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}
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/// <summary>
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/// Removes a device (and it's children) from the list of devices being published by this server, making them undiscoverable.
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/// </summary>
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/// <remarks>
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/// <para>Removing a device causes "byebye" notification messages to be sent immediately, advising clients of the device/service becoming unavailable. We recommend removing the device from the published list before shutting down the actual device/service, if possible.</para>
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/// <para>This method does nothing if the device was not found in the collection.</para>
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/// </remarks>
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/// <param name="device">The <see cref="SsdpDevice"/> instance to add.</param>
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/// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="device"/> argument is null.</exception>
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public async Task RemoveDevice(SsdpRootDevice device)
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{
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if (device == null) throw new ArgumentNullException("device");
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bool wasRemoved = false;
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TimeSpan minCacheTime = TimeSpan.Zero;
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lock (_Devices)
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{
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if (_Devices.Contains(device))
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{
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_Devices.Remove(device);
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wasRemoved = true;
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minCacheTime = GetMinimumNonZeroCacheLifetime();
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}
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}
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if (wasRemoved)
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{
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WriteTrace("Device Removed", device);
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await SendByeByeNotifications(device, true, CancellationToken.None).ConfigureAwait(false);
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}
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}
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/// <summary>
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/// Returns a read only list of devices being published by this instance.
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/// </summary>
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public IEnumerable<SsdpRootDevice> Devices
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{
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get
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{
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return _ReadOnlyDevices;
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}
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}
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/// <summary>
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/// If true (default) treats root devices as both upnp:rootdevice and pnp:rootdevice types.
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/// </summary>
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/// <remarks>
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/// <para>Enabling this option will cause devices to show up in Microsoft Windows Explorer's network screens (if discovery is enabled etc.). Windows Explorer appears to search only for pnp:rootdeivce and not upnp:rootdevice.</para>
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/// <para>If false, the system will only use upnp:rootdevice for notifiation broadcasts and and search responses, which is correct according to the UPnP/SSDP spec.</para>
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/// </remarks>
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public bool SupportPnpRootDevice
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{
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get { return _SupportPnpRootDevice; }
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set
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{
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_SupportPnpRootDevice = value;
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}
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}
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/// <summary>
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/// Stops listening for requests, stops sending periodic broadcasts, disposes all internal resources.
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/// </summary>
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/// <param name="disposing"></param>
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protected override void Dispose(bool disposing)
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{
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if (disposing)
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{
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DisposeRebroadcastTimer();
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var commsServer = _CommsServer;
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if (commsServer != null)
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{
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commsServer.RequestReceived -= this.CommsServer_RequestReceived;
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}
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var tasks = Devices.ToList().Select(RemoveDevice).ToArray();
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Task.WaitAll(tasks);
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_CommsServer = null;
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if (commsServer != null)
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{
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if (!commsServer.IsShared)
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commsServer.Dispose();
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}
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_RecentSearchRequests = null;
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}
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}
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private void ProcessSearchRequest(string mx, string searchTarget, IpEndPointInfo remoteEndPoint, IpAddressInfo receivedOnlocalIpAddress, CancellationToken cancellationToken)
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{
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if (String.IsNullOrEmpty(searchTarget))
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{
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WriteTrace(String.Format("Invalid search request received From {0}, Target is null/empty.", remoteEndPoint.ToString()));
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return;
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}
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//WriteTrace(String.Format("Search Request Received From {0}, Target = {1}", remoteEndPoint.ToString(), searchTarget));
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if (IsDuplicateSearchRequest(searchTarget, remoteEndPoint))
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{
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//WriteTrace("Search Request is Duplicate, ignoring.");
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return;
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}
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//Wait on random interval up to MX, as per SSDP spec.
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//Also, as per UPnP 1.1/SSDP spec ignore missing/bank MX header. If over 120, assume random value between 0 and 120.
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//Using 16 as minimum as that's often the minimum system clock frequency anyway.
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int maxWaitInterval = 0;
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if (String.IsNullOrEmpty(mx))
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{
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//Windows Explorer is poorly behaved and doesn't supply an MX header value.
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//if (this.SupportPnpRootDevice)
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mx = "1";
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//else
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//return;
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}
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if (!Int32.TryParse(mx, out maxWaitInterval) || maxWaitInterval <= 0) return;
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if (maxWaitInterval > 120)
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maxWaitInterval = _Random.Next(0, 120);
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//Do not block synchronously as that may tie up a threadpool thread for several seconds.
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Task.Delay(_Random.Next(16, (maxWaitInterval * 1000))).ContinueWith((parentTask) =>
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{
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//Copying devices to local array here to avoid threading issues/enumerator exceptions.
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IEnumerable<SsdpDevice> devices = null;
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lock (_Devices)
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{
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if (String.Compare(SsdpConstants.SsdpDiscoverAllSTHeader, searchTarget, StringComparison.OrdinalIgnoreCase) == 0)
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devices = GetAllDevicesAsFlatEnumerable().ToArray();
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else if (String.Compare(SsdpConstants.UpnpDeviceTypeRootDevice, searchTarget, StringComparison.OrdinalIgnoreCase) == 0 || (this.SupportPnpRootDevice && String.Compare(SsdpConstants.PnpDeviceTypeRootDevice, searchTarget, StringComparison.OrdinalIgnoreCase) == 0))
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devices = _Devices.ToArray();
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else if (searchTarget.Trim().StartsWith("uuid:", StringComparison.OrdinalIgnoreCase))
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devices = (from device in GetAllDevicesAsFlatEnumerable() where String.Compare(device.Uuid, searchTarget.Substring(5), StringComparison.OrdinalIgnoreCase) == 0 select device).ToArray();
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else if (searchTarget.StartsWith("urn:", StringComparison.OrdinalIgnoreCase))
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devices = (from device in GetAllDevicesAsFlatEnumerable() where String.Compare(device.FullDeviceType, searchTarget, StringComparison.OrdinalIgnoreCase) == 0 select device).ToArray();
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}
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if (devices != null)
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{
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var deviceList = devices.ToList();
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//WriteTrace(String.Format("Sending {0} search responses", deviceList.Count));
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foreach (var device in deviceList)
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{
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SendDeviceSearchResponses(device, remoteEndPoint, receivedOnlocalIpAddress, cancellationToken);
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}
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}
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else
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{
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//WriteTrace(String.Format("Sending 0 search responses."));
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}
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});
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}
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private IEnumerable<SsdpDevice> GetAllDevicesAsFlatEnumerable()
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{
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return _Devices.Union(_Devices.SelectManyRecursive<SsdpDevice>((d) => d.Devices));
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}
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private void SendDeviceSearchResponses(SsdpDevice device, IpEndPointInfo endPoint, IpAddressInfo receivedOnlocalIpAddress, CancellationToken cancellationToken)
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{
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bool isRootDevice = (device as SsdpRootDevice) != null;
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if (isRootDevice)
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{
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SendSearchResponse(SsdpConstants.UpnpDeviceTypeRootDevice, device, GetUsn(device.Udn, SsdpConstants.UpnpDeviceTypeRootDevice), endPoint, receivedOnlocalIpAddress, cancellationToken);
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if (this.SupportPnpRootDevice)
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SendSearchResponse(SsdpConstants.PnpDeviceTypeRootDevice, device, GetUsn(device.Udn, SsdpConstants.PnpDeviceTypeRootDevice), endPoint, receivedOnlocalIpAddress, cancellationToken);
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}
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SendSearchResponse(device.Udn, device, device.Udn, endPoint, receivedOnlocalIpAddress, cancellationToken);
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SendSearchResponse(device.FullDeviceType, device, GetUsn(device.Udn, device.FullDeviceType), endPoint, receivedOnlocalIpAddress, cancellationToken);
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}
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private string GetUsn(string udn, string fullDeviceType)
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{
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return String.Format("{0}::{1}", udn, fullDeviceType);
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}
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private async void SendSearchResponse(string searchTarget, SsdpDevice device, string uniqueServiceName, IpEndPointInfo endPoint, IpAddressInfo receivedOnlocalIpAddress, CancellationToken cancellationToken)
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{
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var rootDevice = device.ToRootDevice();
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//var additionalheaders = FormatCustomHeadersForResponse(device);
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const string header = "HTTP/1.1 200 OK";
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var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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values["EXT"] = "";
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values["DATE"] = DateTime.UtcNow.ToString("r");
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values["CACHE-CONTROL"] = "max-age = " + rootDevice.CacheLifetime.TotalSeconds;
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values["ST"] = searchTarget;
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values["SERVER"] = string.Format("{0}/{1} UPnP/1.0 RSSDP/{2}", _OSName, _OSVersion, ServerVersion);
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values["USN"] = uniqueServiceName;
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values["LOCATION"] = rootDevice.Location.ToString();
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var message = BuildMessage(header, values);
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try
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{
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await _CommsServer.SendMessage(System.Text.Encoding.UTF8.GetBytes(message), endPoint, receivedOnlocalIpAddress, cancellationToken).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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}
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//WriteTrace(String.Format("Sent search response to " + endPoint.ToString()), device);
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}
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private bool IsDuplicateSearchRequest(string searchTarget, IpEndPointInfo endPoint)
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{
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var isDuplicateRequest = false;
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var newRequest = new SearchRequest() { EndPoint = endPoint, SearchTarget = searchTarget, Received = DateTime.UtcNow };
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lock (_RecentSearchRequests)
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{
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if (_RecentSearchRequests.ContainsKey(newRequest.Key))
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{
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var lastRequest = _RecentSearchRequests[newRequest.Key];
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if (lastRequest.IsOld())
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_RecentSearchRequests[newRequest.Key] = newRequest;
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else
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isDuplicateRequest = true;
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}
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else
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{
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_RecentSearchRequests.Add(newRequest.Key, newRequest);
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if (_RecentSearchRequests.Count > 10)
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CleanUpRecentSearchRequestsAsync();
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}
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}
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return isDuplicateRequest;
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}
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private void CleanUpRecentSearchRequestsAsync()
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{
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lock (_RecentSearchRequests)
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{
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foreach (var requestKey in (from r in _RecentSearchRequests where r.Value.IsOld() select r.Key).ToArray())
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{
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_RecentSearchRequests.Remove(requestKey);
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}
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}
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}
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private void SendAllAliveNotifications(object state)
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{
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try
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{
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if (IsDisposed) return;
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//WriteTrace("Begin Sending Alive Notifications For All Devices");
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SsdpRootDevice[] devices;
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lock (_Devices)
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{
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devices = _Devices.ToArray();
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}
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foreach (var device in devices)
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{
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if (IsDisposed) return;
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SendAliveNotifications(device, true, CancellationToken.None);
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}
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//WriteTrace("Completed Sending Alive Notifications For All Devices");
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}
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catch (ObjectDisposedException ex)
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{
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WriteTrace("Publisher stopped, exception " + ex.Message);
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Dispose();
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}
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}
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private void SendAliveNotifications(SsdpDevice device, bool isRoot, CancellationToken cancellationToken)
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{
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if (isRoot)
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{
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SendAliveNotification(device, SsdpConstants.UpnpDeviceTypeRootDevice, GetUsn(device.Udn, SsdpConstants.UpnpDeviceTypeRootDevice), cancellationToken);
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if (this.SupportPnpRootDevice)
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SendAliveNotification(device, SsdpConstants.PnpDeviceTypeRootDevice, GetUsn(device.Udn, SsdpConstants.PnpDeviceTypeRootDevice), cancellationToken);
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}
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SendAliveNotification(device, device.Udn, device.Udn, cancellationToken);
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SendAliveNotification(device, device.FullDeviceType, GetUsn(device.Udn, device.FullDeviceType), cancellationToken);
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foreach (var childDevice in device.Devices)
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{
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SendAliveNotifications(childDevice, false, cancellationToken);
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}
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}
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private void SendAliveNotification(SsdpDevice device, string notificationType, string uniqueServiceName, CancellationToken cancellationToken)
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{
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var rootDevice = device.ToRootDevice();
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const string header = "NOTIFY * HTTP/1.1";
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var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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// If needed later for non-server devices, these headers will need to be dynamic
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values["HOST"] = "239.255.255.250:1900";
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values["DATE"] = DateTime.UtcNow.ToString("r");
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values["CACHE-CONTROL"] = "max-age = " + rootDevice.CacheLifetime.TotalSeconds;
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values["LOCATION"] = rootDevice.Location.ToString();
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values["SERVER"] = string.Format("{0}/{1} UPnP/1.0 RSSDP/{2}", _OSName, _OSVersion, ServerVersion);
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values["NTS"] = "ssdp:alive";
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values["NT"] = notificationType;
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values["USN"] = uniqueServiceName;
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var message = BuildMessage(header, values);
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_CommsServer.SendMulticastMessage(message, cancellationToken);
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//WriteTrace(String.Format("Sent alive notification"), device);
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}
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private Task SendByeByeNotifications(SsdpDevice device, bool isRoot, CancellationToken cancellationToken)
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{
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var tasks = new List<Task>();
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if (isRoot)
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{
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tasks.Add(SendByeByeNotification(device, SsdpConstants.UpnpDeviceTypeRootDevice, GetUsn(device.Udn, SsdpConstants.UpnpDeviceTypeRootDevice), cancellationToken));
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if (this.SupportPnpRootDevice)
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tasks.Add(SendByeByeNotification(device, "pnp:rootdevice", GetUsn(device.Udn, "pnp:rootdevice"), cancellationToken));
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}
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tasks.Add(SendByeByeNotification(device, device.Udn, device.Udn, cancellationToken));
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tasks.Add(SendByeByeNotification(device, String.Format("urn:{0}", device.FullDeviceType), GetUsn(device.Udn, device.FullDeviceType), cancellationToken));
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foreach (var childDevice in device.Devices)
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{
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tasks.Add(SendByeByeNotifications(childDevice, false, cancellationToken));
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}
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return Task.WhenAll(tasks);
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}
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[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", MessageId = "byebye", Justification = "Correct value for this type of notification in SSDP.")]
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private Task SendByeByeNotification(SsdpDevice device, string notificationType, string uniqueServiceName, CancellationToken cancellationToken)
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{
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const string header = "NOTIFY * HTTP/1.1";
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var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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// If needed later for non-server devices, these headers will need to be dynamic
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values["HOST"] = "239.255.255.250:1900";
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values["DATE"] = DateTime.UtcNow.ToString("r");
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values["SERVER"] = string.Format("{0}/{1} UPnP/1.0 RSSDP/{2}", _OSName, _OSVersion, ServerVersion);
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values["NTS"] = "ssdp:byebye";
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values["NT"] = notificationType;
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values["USN"] = uniqueServiceName;
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var message = BuildMessage(header, values);
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var sendCount = IsDisposed ? 1 : 3;
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WriteTrace(String.Format("Sent byebye notification"), device);
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return _CommsServer.SendMulticastMessage(message, sendCount, cancellationToken);
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}
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private void DisposeRebroadcastTimer()
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{
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var timer = _RebroadcastAliveNotificationsTimer;
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_RebroadcastAliveNotificationsTimer = null;
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if (timer != null)
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|
timer.Dispose();
|
|
}
|
|
|
|
private TimeSpan GetMinimumNonZeroCacheLifetime()
|
|
{
|
|
var nonzeroCacheLifetimesQuery = (from device
|
|
in _Devices
|
|
where device.CacheLifetime != TimeSpan.Zero
|
|
select device.CacheLifetime).ToList();
|
|
|
|
if (nonzeroCacheLifetimesQuery.Any())
|
|
return nonzeroCacheLifetimesQuery.Min();
|
|
else
|
|
return TimeSpan.Zero;
|
|
}
|
|
|
|
private string GetFirstHeaderValue(System.Net.Http.Headers.HttpRequestHeaders httpRequestHeaders, string headerName)
|
|
{
|
|
string retVal = null;
|
|
IEnumerable<String> values = null;
|
|
if (httpRequestHeaders.TryGetValues(headerName, out values) && values != null)
|
|
retVal = values.FirstOrDefault();
|
|
|
|
return retVal;
|
|
}
|
|
|
|
public Action<string> LogFunction { get; set; }
|
|
|
|
private void WriteTrace(string text)
|
|
{
|
|
if (LogFunction != null)
|
|
{
|
|
LogFunction(text);
|
|
}
|
|
//System.Diagnostics.Debug.WriteLine(text, "SSDP Publisher");
|
|
}
|
|
|
|
private void WriteTrace(string text, SsdpDevice device)
|
|
{
|
|
var rootDevice = device as SsdpRootDevice;
|
|
if (rootDevice != null)
|
|
WriteTrace(text + " " + device.DeviceType + " - " + device.Uuid + " - " + rootDevice.Location);
|
|
else
|
|
WriteTrace(text + " " + device.DeviceType + " - " + device.Uuid);
|
|
}
|
|
|
|
private void CommsServer_RequestReceived(object sender, RequestReceivedEventArgs e)
|
|
{
|
|
if (this.IsDisposed) return;
|
|
|
|
if (string.Equals(e.Message.Method.Method, SsdpConstants.MSearchMethod, StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
//According to SSDP/UPnP spec, ignore message if missing these headers.
|
|
// Edit: But some devices do it anyway
|
|
//if (!e.Message.Headers.Contains("MX"))
|
|
// WriteTrace("Ignoring search request - missing MX header.");
|
|
//else if (!e.Message.Headers.Contains("MAN"))
|
|
// WriteTrace("Ignoring search request - missing MAN header.");
|
|
//else
|
|
ProcessSearchRequest(GetFirstHeaderValue(e.Message.Headers, "MX"), GetFirstHeaderValue(e.Message.Headers, "ST"), e.ReceivedFrom, e.LocalIpAddress, CancellationToken.None);
|
|
}
|
|
}
|
|
|
|
private class SearchRequest
|
|
{
|
|
public IpEndPointInfo EndPoint { get; set; }
|
|
public DateTime Received { get; set; }
|
|
public string SearchTarget { get; set; }
|
|
|
|
public string Key
|
|
{
|
|
get { return this.SearchTarget + ":" + this.EndPoint.ToString(); }
|
|
}
|
|
|
|
public bool IsOld()
|
|
{
|
|
return DateTime.UtcNow.Subtract(this.Received).TotalMilliseconds > 500;
|
|
}
|
|
}
|
|
}
|
|
} |