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using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using MediaBrowser.Model.Net;
namespace Emby.Server.Implementations.Net
{
public class SocketFactory : ISocketFactory
{
public ISocket CreateUdpBroadcastSocket(int localPort)
{
if (localPort < 0)
{
throw new ArgumentException("localPort cannot be less than zero.", nameof(localPort));
}
var retVal = new Socket(AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Dgram, System.Net.Sockets.ProtocolType.Udp);
try
{
retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
return new UdpSocket(retVal, localPort, IPAddress.Any);
}
catch
{
retVal?.Dispose();
throw;
}
}
/// <summary>
/// Creates a new UDP acceptSocket that is a member of the SSDP multicast local admin group and binds it to the specified local port.
/// </summary>
/// <returns>An implementation of the <see cref="ISocket"/> interface used by RSSDP components to perform acceptSocket operations.</returns>
public ISocket CreateSsdpUdpSocket(IPAddress localIpAddress, int localPort)
{
if (localPort < 0)
{
throw new ArgumentException("localPort cannot be less than zero.", nameof(localPort));
}
var retVal = new Socket(AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Dgram, System.Net.Sockets.ProtocolType.Udp);
try
{
retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 4);
retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("239.255.255.250"), localIpAddress));
return new UdpSocket(retVal, localPort, localIpAddress);
}
catch
{
retVal?.Dispose();
throw;
}
}
/// <summary>
/// Creates a new UDP acceptSocket that is a member of the specified multicast IP address, and binds it to the specified local port.
/// </summary>
/// <param name="ipAddress">The multicast IP address to make the acceptSocket a member of.</param>
/// <param name="multicastTimeToLive">The multicast time to live value for the acceptSocket.</param>
/// <param name="localPort">The number of the local port to bind to.</param>
/// <returns></returns>
public ISocket CreateUdpMulticastSocket(string ipAddress, int multicastTimeToLive, int localPort)
{
if (ipAddress == null)
{
throw new ArgumentNullException(nameof(ipAddress));
}
if (ipAddress.Length == 0)
{
throw new ArgumentException("ipAddress cannot be an empty string.", nameof(ipAddress));
}
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 retVal = new Socket(AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Dgram, System.Net.Sockets.ProtocolType.Udp);
try
{
// not supported on all platforms. throws on ubuntu with .net core 2.0
retVal.ExclusiveAddressUse = false;
}
catch (SocketException)
{
}
try
{
// seeing occasional exceptions thrown on qnap
// System.Net.Sockets.SocketException (0x80004005): Protocol not available
retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
}
catch (SocketException)
{
}
try
{
//retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, multicastTimeToLive);
var localIp = IPAddress.Any;
retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse(ipAddress), localIp));
retVal.MulticastLoopback = true;
return new UdpSocket(retVal, localPort, localIp);
}
catch
{
retVal?.Dispose();
throw;
}
}
}
}
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