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146 lines
4.9 KiB
146 lines
4.9 KiB
using System;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Text.Json;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Controller;
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using MediaBrowser.Model.ApiClient;
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using Microsoft.Extensions.Configuration;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.Udp
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{
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/// <summary>
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/// Provides a Udp Server.
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/// </summary>
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public sealed class UdpServer : IDisposable
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{
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/// <summary>
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/// Address Override Configuration Key.
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/// </summary>
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public const string AddressOverrideConfigKey = "PublishedServerUrl";
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/// <summary>
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/// The _logger.
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/// </summary>
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private readonly ILogger _logger;
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private readonly IServerApplicationHost _appHost;
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private readonly IConfiguration _config;
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private readonly byte[] _receiveBuffer = new byte[8192];
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private Socket _udpSocket;
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private IPEndPoint _endpoint;
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private bool _disposed = false;
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/// <summary>
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/// Initializes a new instance of the <see cref="UdpServer" /> class.
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/// </summary>
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/// <param name="logger">The logger.</param>
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/// <param name="appHost">The application host.</param>
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/// <param name="configuration">The configuration manager.</param>
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/// <param name="port">The port.</param>
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public UdpServer(
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ILogger logger,
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IServerApplicationHost appHost,
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IConfiguration configuration,
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int port)
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{
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_logger = logger;
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_appHost = appHost;
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_config = configuration;
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_endpoint = new IPEndPoint(IPAddress.Any, port);
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_udpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
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_udpSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
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}
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private async Task RespondToV2Message(EndPoint endpoint, CancellationToken cancellationToken)
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{
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string? localUrl = _config[AddressOverrideConfigKey];
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if (string.IsNullOrEmpty(localUrl))
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{
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localUrl = _appHost.GetSmartApiUrl(((IPEndPoint)endpoint).Address);
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}
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if (string.IsNullOrEmpty(localUrl))
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{
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_logger.LogWarning("Unable to respond to udp request because the local ip address could not be determined.");
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return;
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}
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var response = new ServerDiscoveryInfo(localUrl, _appHost.SystemId, _appHost.FriendlyName);
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try
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{
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await _udpSocket.SendToAsync(JsonSerializer.SerializeToUtf8Bytes(response), SocketFlags.None, endpoint, cancellationToken).ConfigureAwait(false);
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}
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catch (SocketException ex)
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{
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_logger.LogError(ex, "Error sending response message");
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}
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}
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/// <summary>
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/// Starts the specified port.
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/// </summary>
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/// <param name="cancellationToken">The cancellation token to cancel operation.</param>
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public void Start(CancellationToken cancellationToken)
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{
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_udpSocket.Bind(_endpoint);
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_ = Task.Run(async () => await BeginReceiveAsync(cancellationToken).ConfigureAwait(false), cancellationToken).ConfigureAwait(false);
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}
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private async Task BeginReceiveAsync(CancellationToken cancellationToken)
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{
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var infiniteTask = Task.Delay(-1, cancellationToken);
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while (!cancellationToken.IsCancellationRequested)
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{
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try
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{
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var task = _udpSocket.ReceiveFromAsync(_receiveBuffer, SocketFlags.None, _endpoint);
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await Task.WhenAny(task, infiniteTask).ConfigureAwait(false);
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if (!task.IsCompleted)
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{
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return;
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}
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var result = task.Result;
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var text = Encoding.UTF8.GetString(_receiveBuffer, 0, result.ReceivedBytes);
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if (text.Contains("who is JellyfinServer?", StringComparison.OrdinalIgnoreCase))
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{
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await RespondToV2Message(result.RemoteEndPoint, cancellationToken).ConfigureAwait(false);
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}
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}
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catch (SocketException ex)
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{
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_logger.LogError(ex, "Failed to receive data from socket");
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}
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catch (OperationCanceledException)
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{
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// Don't throw
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}
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}
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}
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/// <inheritdoc />
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public void Dispose()
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{
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if (_disposed)
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{
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return;
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}
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_udpSocket?.Dispose();
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GC.SuppressFinalize(this);
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}
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}
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}
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