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; } } /// /// Creates a new UDP acceptSocket that is a member of the SSDP multicast local admin group and binds it to the specified local port. /// /// An implementation of the interface used by RSSDP components to perform acceptSocket operations. 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; } } /// /// Creates a new UDP acceptSocket that is a member of the specified multicast IP address, and binds it to the specified local port. /// /// The multicast IP address to make the acceptSocket a member of. /// The multicast time to live value for the acceptSocket. /// The number of the local port to bind to. /// 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; } } } }