net-mdns

A simple Multicast Domain Name Service based on RFC 6762. Can be used as both a client (sending queries) or a server (responding to queries).

Features

Targets .NET Standard 1.4 and 2.0
Supports IPv6 and IPv4 platforms
CI on Circle (Debian GNU/Linux), Travis (Ubuntu Trusty) and AppVeyor (Windows Server 2016)
Periodically checks for new network interfaces

Getting started

Published releases are available on NuGet. To install, run the following command in the Package Manager Console.

PM> Install-Package Makaretu.Mdns

Usage

Discovery

Get all the Apple TVs. The query is sent when a network interface is discovered.

using Makaretu.Dns;

var mdns = new MulticastService();
mdns.NetworkInterfaceDiscovered += (s, e) => mdns.SendQuery("appletv.local");
mdns.AnswerReceived += (s, e) => { // do something with e.Message };
mdns.Start();

Broadcasting

Respond to a query for the service.

using Makaretu.Dns;

var service = "...";
var mdns = new MulticastService();
mdns.QueryReceived += (s, e) =>
{
    var msg = e.Message;
    if (msg.Questions.Any(q => q.Name == service))
    {
        var res = msg.CreateResponse();
        var addresses = MulticastService.GetIPAddresses()
            .Where(ip => ip.AddressFamily == AddressFamily.InterNetwork);
        foreach (var address in addresses)
        {
            res.Answers.Add(new ARecord
            {
                Name = service,
                Address = address
            });
        }
        mdns.SendAnswer(res);
    }
};
mdns.Start();

License

The package is licensed under the MIT license. Refer to the LICENSE file for more information.

benoitjadinon / net-mdns