using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Net.Sockets; using System.Threading.Tasks; using MediaBrowser.Model.Net; namespace Emby.Common.Implementations.Net { public class SocketFactory : ISocketFactory { // THIS IS A LINKED FILE - SHARED AMONGST MULTIPLE PLATFORMS // Be careful to check any changes compile and work for all platform projects it is shared in. // Not entirely happy with this. Would have liked to have done something more generic/reusable, // but that wasn't really the point so kept to YAGNI principal for now, even if the // interfaces are a bit ugly, specific and make assumptions. /// /// Used by RSSDP components to create implementations of the interface, to perform platform agnostic socket communications. /// private IPAddress _LocalIP; /// /// Default constructor. /// /// A string containing the IP address of the local network adapter to bind sockets to. Null or empty string will use . public SocketFactory(string localIP) { if (String.IsNullOrEmpty(localIP)) _LocalIP = IPAddress.Any; else _LocalIP = IPAddress.Parse(localIP); } #region ISocketFactory Members /// /// Creates a new UDP socket and binds it to the specified local port. /// /// An integer specifying the local port to bind the socket to. public IUdpSocket CreateUdpSocket(int localPort) { if (localPort < 0) throw new ArgumentException("localPort cannot be less than zero.", "localPort"); var retVal = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); try { retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); return new UdpSocket(retVal, localPort, _LocalIP); } catch { if (retVal != null) retVal.Dispose(); throw; } } /// /// Creates a new UDP socket that is a member of the SSDP multicast local admin group and binds it to the specified local port. /// /// An integer specifying the local port to bind the socket to. /// An implementation of the interface used by RSSDP components to perform socket operations. public IUdpSocket CreateSsdpUdpSocket(int localPort) { if (localPort < 0) throw new ArgumentException("localPort cannot be less than zero.", "localPort"); var retVal = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 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"), _LocalIP)); return new UdpSocket(retVal, localPort, _LocalIP); } catch { if (retVal != null) retVal.Dispose(); throw; } } /// /// Creates a new UDP socket 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 socket a member of. /// The multicast time to live value for the socket. /// The number of the local port to bind to. /// public IUdpSocket CreateUdpMulticastSocket(string ipAddress, int multicastTimeToLive, int localPort) { if (ipAddress == null) throw new ArgumentNullException("ipAddress"); if (ipAddress.Length == 0) throw new ArgumentException("ipAddress cannot be an empty string.", "ipAddress"); if (multicastTimeToLive <= 0) throw new ArgumentException("multicastTimeToLive cannot be zero or less.", "multicastTimeToLive"); if (localPort < 0) throw new ArgumentException("localPort cannot be less than zero.", "localPort"); var retVal = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); try { #if NETSTANDARD1_3 // The ExclusiveAddressUse socket option is a Windows-specific option that, when set to "true," tells Windows not to allow another socket to use the same local address as this socket // See https://github.com/dotnet/corefx/pull/11509 for more details if (System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows)) { retVal.ExclusiveAddressUse = false; } #else retVal.ExclusiveAddressUse = false; #endif retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, multicastTimeToLive); retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse(ipAddress), _LocalIP)); retVal.MulticastLoopback = true; return new UdpSocket(retVal, localPort, _LocalIP); } catch { if (retVal != null) retVal.Dispose(); throw; } } #endregion } }