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using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller;
using MediaBrowser.Model.ApiClient;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
namespace Jellyfin.Networking;
/// <summary>
/// <see cref="BackgroundService"/> responsible for responding to auto-discovery messages.
/// </summary>
public sealed class AutoDiscoveryHost : BackgroundService
{
/// <summary>
/// The port to listen on for auto-discovery messages.
/// </summary>
private const int PortNumber = 7359;
private readonly ILogger<AutoDiscoveryHost> _logger;
private readonly IServerApplicationHost _appHost;
private readonly IConfigurationManager _configurationManager;
private readonly INetworkManager _networkManager;
/// <summary>
/// Initializes a new instance of the <see cref="AutoDiscoveryHost" /> class.
/// </summary>
/// <param name="logger">The <see cref="ILogger{AutoDiscoveryHost}"/>.</param>
/// <param name="appHost">The <see cref="IServerApplicationHost"/>.</param>
/// <param name="configurationManager">The <see cref="IConfigurationManager"/>.</param>
/// <param name="networkManager">The <see cref="INetworkManager"/>.</param>
public AutoDiscoveryHost(
ILogger<AutoDiscoveryHost> logger,
IServerApplicationHost appHost,
IConfigurationManager configurationManager,
INetworkManager networkManager)
{
_logger = logger;
_appHost = appHost;
_configurationManager = configurationManager;
_networkManager = networkManager;
}
/// <inheritdoc />
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
var networkConfig = _configurationManager.GetNetworkConfiguration();
if (!networkConfig.AutoDiscovery)
{
return;
}
await ListenForAutoDiscoveryMessage(IPAddress.Any, stoppingToken).ConfigureAwait(false);
}
private async Task ListenForAutoDiscoveryMessage(IPAddress listenAddress, CancellationToken cancellationToken)
{
try
{
using var udpClient = new UdpClient(new IPEndPoint(listenAddress, PortNumber));
udpClient.MulticastLoopback = false;
while (!cancellationToken.IsCancellationRequested)
{
try
{
var result = await udpClient.ReceiveAsync(cancellationToken).ConfigureAwait(false);
var text = Encoding.UTF8.GetString(result.Buffer);
if (text.Contains("who is JellyfinServer?", StringComparison.OrdinalIgnoreCase))
{
await RespondToV2Message(result.RemoteEndPoint, udpClient, cancellationToken).ConfigureAwait(false);
}
}
catch (SocketException ex)
{
_logger.LogError(ex, "Failed to receive data from socket");
}
}
}
catch (OperationCanceledException)
{
_logger.LogDebug("Broadcast socket operation cancelled");
}
catch (Exception ex)
{
// Exception in this function will prevent the background service from restarting in-process.
_logger.LogError(ex, "Unable to bind to {Address}:{Port}", listenAddress, PortNumber);
}
}
private async Task RespondToV2Message(IPEndPoint endpoint, UdpClient broadCastUdpClient, CancellationToken cancellationToken)
{
var localUrl = _appHost.GetSmartApiUrl(endpoint.Address);
if (string.IsNullOrEmpty(localUrl))
{
_logger.LogWarning("Unable to respond to server discovery request because the local ip address could not be determined");
return;
}
var response = new ServerDiscoveryInfo(localUrl, _appHost.SystemId, _appHost.FriendlyName);
try
{
_logger.LogDebug("Sending AutoDiscovery response");
await broadCastUdpClient
.SendAsync(JsonSerializer.SerializeToUtf8Bytes(response).AsMemory(), endpoint, cancellationToken)
.ConfigureAwait(false);
}
catch (SocketException ex)
{
_logger.LogError(ex, "Error sending response message");
}
}
}
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