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using System;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using MediaBrowser.Model.Net;
namespace Emby.Server.Implementations.Net
{
/// <summary>
/// Factory class to create different kinds of sockets.
/// </summary>
public class SocketFactory : ISocketFactory
{
/// <inheritdoc />
public Socket CreateUdpBroadcastSocket(int localPort)
{
if (localPort < 0)
{
throw new ArgumentException("localPort cannot be less than zero.", nameof(localPort));
}
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
try
{
socket.EnableBroadcast = true;
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
socket.Bind(new IPEndPoint(IPAddress.Any, localPort));
return socket;
}
catch
{
socket.Dispose();
throw;
}
}
/// <inheritdoc />
public Socket CreateSsdpUdpSocket(IPData bindInterface, int localPort)
{
var interfaceAddress = bindInterface.Address;
ArgumentNullException.ThrowIfNull(interfaceAddress);
if (localPort < 0)
{
throw new ArgumentException("localPort cannot be less than zero.", nameof(localPort));
}
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
try
{
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
socket.Bind(new IPEndPoint(interfaceAddress, localPort));
return socket;
}
catch
{
socket.Dispose();
throw;
}
}
/// <inheritdoc />
public Socket CreateUdpMulticastSocket(IPAddress multicastAddress, IPData bindInterface, int multicastTimeToLive, int localPort)
{
var bindIPAddress = bindInterface.Address;
ArgumentNullException.ThrowIfNull(multicastAddress);
ArgumentNullException.ThrowIfNull(bindIPAddress);
if (multicastTimeToLive <= 0)
{
throw new ArgumentException("multicastTimeToLive cannot be zero or less.", nameof(multicastTimeToLive));
}
if (localPort < 0)
{
throw new ArgumentException("localPort cannot be less than zero.", nameof(localPort));
}
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
try
{
socket.MulticastLoopback = false;
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.PacketInformation, true);
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, multicastTimeToLive);
if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
{
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(multicastAddress));
socket.Bind(new IPEndPoint(multicastAddress, localPort));
}
else
{
// Only create socket if interface supports multicast
var interfaceIndex = bindInterface.Index;
var interfaceIndexSwapped = IPAddress.HostToNetworkOrder(interfaceIndex);
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(multicastAddress, interfaceIndex));
socket.Bind(new IPEndPoint(bindIPAddress, localPort));
}
return socket;
}
catch
{
socket.Dispose();
throw;
}
}
}
}
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