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).
A higher level DNS Service Discovery based on RFC 6763 that automatically responds to any query for the service or service instance.
- Targets Framework 4.6.1, .NET Standard 1.4 and 2.0
- Supports IPv6 and IPv4 platforms
- CI on Circle (Debian GNU/Linux), Travis (Ubuntu Xenial and OSX) and AppVeyor (Windows Server 2016)
- Detects new and/or removed network interfaces
- Supports multicasting on multiple network interfaces
- Supports reverse address mapping
- Supports service subtypes (features)
- Handles legacy unicast queries, see #61
Published releases are available on NuGet. To install, run the following command in the Package Manager Console
PM> Install-Package Makaretu.Dns.Multicast
or using .NET CLI run the following command in the project folder
> dotnet add package Makaretu.Dns.Multicast
Always broadcast the service ("foo") running on local host with port 1024.
using Makaretu.Dns;
var service = new ServiceProfile("x", "_foo._tcp", 1024);
var sd = new ServiceDiscovery();
sd.Advertise(service);See the example advertiser for a working program.
Find all services running on the local link.
using Makaretu.Dns;
var sd = new ServiceDiscovery();
sd.ServiceDiscovered += (s, serviceName) => { // Do something };Find all service instances running on the local link.
using Makaretu.Dns;
var sd = new ServiceDiscovery();
sd.ServiceInstanceDiscovered += (s, e) => { // Do something };See the example browser for a working program.
Get all the Apple TVs. The query is sent when a network interface is discovered.
The AnsweredReceived callback contains any answer that is seen, not just the answer
to the specific query.
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();Get the first answer to Apple TVs. Wait 2 seconds for an answer.
using Makaretu.Dns;
var service = "appletv.local";
var query = new Message();
query.Questions.Add(new Question { Name = service, Type = DnsType.ANY });
var cancellation = new CancellationTokenSource(2000);
using (var mdns = new MulticastService())
{
mdns.Start();
var response = await mdns.ResolveAsync(query, cancellation.Token);
// Do something
}Respond to a query for the service. Note that ServiceDiscovery.Advertise is much easier.
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();- net-dns - DNS data model and Name Server with serializer for the wire and master file format
- net-udns - client for unicast DNS, DNS over HTTPS (DOH) and DNS over TLS (DOT)
Copyright © 2018-2019 Richard Schneider ([email protected])
The package is licensed under the MIT license. Refer to the LICENSE file for more information.
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