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134 lines
6 KiB
C#
134 lines
6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Net;
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namespace Emby.Common.Implementations.Net
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{
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public class SocketFactory : ISocketFactory
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{
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// THIS IS A LINKED FILE - SHARED AMONGST MULTIPLE PLATFORMS
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// Be careful to check any changes compile and work for all platform projects it is shared in.
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// Not entirely happy with this. Would have liked to have done something more generic/reusable,
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// but that wasn't really the point so kept to YAGNI principal for now, even if the
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// interfaces are a bit ugly, specific and make assumptions.
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/// <summary>
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/// Used by RSSDP components to create implementations of the <see cref="IUdpSocket"/> interface, to perform platform agnostic socket communications.
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/// </summary>
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private IPAddress _LocalIP;
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/// <summary>
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/// Default constructor.
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/// </summary>
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/// <param name="localIP">A string containing the IP address of the local network adapter to bind sockets to. Null or empty string will use <see cref="IPAddress.Any"/>.</param>
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public SocketFactory(string localIP)
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{
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if (String.IsNullOrEmpty(localIP))
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_LocalIP = IPAddress.Any;
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else
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_LocalIP = IPAddress.Parse(localIP);
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}
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#region ISocketFactory Members
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/// <summary>
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/// Creates a new UDP socket and binds it to the specified local port.
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/// </summary>
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/// <param name="localPort">An integer specifying the local port to bind the socket to.</param>
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public IUdpSocket CreateUdpSocket(int localPort)
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{
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if (localPort < 0) throw new ArgumentException("localPort cannot be less than zero.", "localPort");
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var retVal = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
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try
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{
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retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
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return new UdpSocket(retVal, localPort, _LocalIP);
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}
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catch
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{
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if (retVal != null)
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retVal.Dispose();
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throw;
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}
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}
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/// <summary>
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/// Creates a new UDP socket that is a member of the SSDP multicast local admin group and binds it to the specified local port.
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/// </summary>
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/// <param name="localPort">An integer specifying the local port to bind the socket to.</param>
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/// <returns>An implementation of the <see cref="IUdpSocket"/> interface used by RSSDP components to perform socket operations.</returns>
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public IUdpSocket CreateSsdpUdpSocket(int localPort)
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{
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if (localPort < 0) throw new ArgumentException("localPort cannot be less than zero.", "localPort");
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var retVal = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
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try
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{
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retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
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retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 4);
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retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("239.255.255.250"), _LocalIP));
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return new UdpSocket(retVal, localPort, _LocalIP);
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}
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catch
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{
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if (retVal != null)
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retVal.Dispose();
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throw;
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}
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}
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/// <summary>
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/// Creates a new UDP socket that is a member of the specified multicast IP address, and binds it to the specified local port.
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/// </summary>
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/// <param name="ipAddress">The multicast IP address to make the socket a member of.</param>
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/// <param name="multicastTimeToLive">The multicast time to live value for the socket.</param>
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/// <param name="localPort">The number of the local port to bind to.</param>
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/// <returns></returns>
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public IUdpSocket CreateUdpMulticastSocket(string ipAddress, int multicastTimeToLive, int localPort)
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{
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if (ipAddress == null) throw new ArgumentNullException("ipAddress");
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if (ipAddress.Length == 0) throw new ArgumentException("ipAddress cannot be an empty string.", "ipAddress");
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if (multicastTimeToLive <= 0) throw new ArgumentException("multicastTimeToLive cannot be zero or less.", "multicastTimeToLive");
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if (localPort < 0) throw new ArgumentException("localPort cannot be less than zero.", "localPort");
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var retVal = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
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try
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{
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#if NETSTANDARD1_3
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// 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
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// See https://github.com/dotnet/corefx/pull/11509 for more details
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if (System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows))
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{
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retVal.ExclusiveAddressUse = false;
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}
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#else
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retVal.ExclusiveAddressUse = false;
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#endif
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retVal.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
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retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, multicastTimeToLive);
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retVal.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse(ipAddress), _LocalIP));
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retVal.MulticastLoopback = true;
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return new UdpSocket(retVal, localPort, _LocalIP);
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}
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catch
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{
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if (retVal != null)
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retVal.Dispose();
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throw;
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}
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}
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#endregion
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}
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}
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