public Task Start()
{
_mdns.QueryReceived += _mdns_QueryReceived;
var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
foreach (var network in networkInterfaces)
{
_logger.LogDebug(
$"Interface {network.Name}, Type {network.NetworkInterfaceType}, OP Status {network.OperationalStatus}, IP {network.GetIPProperties().UnicastAddresses.FirstOrDefault()}");
}
var weUseAddresses = MulticastService.GetIpAddresses();
foreach (var ip in weUseAddresses)
{
_logger.LogDebug($"We use {ip}");
}
var startMessage = new Message();
startMessage.AuthorityRecords.Add(new SRVRecord
{
Name = $"{_name}.{DnsHapDomain}",
Port = _port,
Target = $"{_hapId.Replace(":", "_")}.local"
});
var q = new Question
{
Type = DnsType.ANY,
Name = $"{_name}.{DnsHapDomain}",
QU = true,
Class = DnsClass.IN
};
startMessage.Questions.Add(q);
_mdns.Start();
#pragma warning disable 4014
Task.Run(async () =>
{
_mdns.SendQuery(startMessage);
await Task.Delay(1000);
q.QU = false;
_mdns.SendQuery(startMessage);
await Task.Delay(1000);
_mdns.SendQuery(startMessage);
await Task.Delay(1000);
}).ConfigureAwait(false);
#pragma warning restore 4014
return Task.CompletedTask;
}
/// <summary>
/// Sends an unsolicited MDNS response describing the
/// service profile.
/// </summary>
/// <param name="profile">
/// The profile to describe.
/// </param>
/// <remarks>
/// Sends a MDNS response <see cref="Message"/> containing the pointer
/// and resource records of the <paramref name="profile"/>.
/// <para>
/// To provide increased robustness against packet loss,
/// two unsolicited responses are sent one second apart.
/// </para>
/// </remarks>
public void Announce(ServiceProfile profile)
{
var message = new Message {
QR = true
};
// Add the shared records.
var ptrRecord = new PTRRecord {
Name = profile.QualifiedServiceName, DomainName = profile.FullyQualifiedName
};
message.Answers.Add(ptrRecord);
// Add the resource records.
profile.Resources.ForEach((resource) =>
{
message.Answers.Add(resource);
});
message.Questions.Add(new Question()
{
Name = profile.ServiceName,
Class = DnsClass.IN,
Type = DnsType.PTR
});
foreach (var ip in MulticastService.GetLinkLocalAddresses())
{
message.AdditionalRecords.Add(new ARecord()
{
Class = DnsClass.IN,
Type = DnsType.A,
Name = profile.ServiceName,
Address = ip,
TTL = TimeSpan.FromSeconds(120)
});
}
Mdns.Send(message, false);
Task.Delay(1000).Wait();
Mdns.Send(message, false);
}
private void _mdns_QueryReceived(object sender, MessageEventArgs e)
{
if (e.Message.IsQuery &&
(e.Message.Questions.Any(a => a.Name.Labels.Contains(HapName))) ||
e.Message.Questions.Any(a => a.Name == ServiceDiscovery.ServiceName))
{
var localAddresses = MulticastService.GetIpAddresses();
var dnsMessage = GenerateQueryResponseMessage();
foreach (var localAddress in localAddresses)
{
if (localAddress.AddressFamily == AddressFamily.InterNetwork)
{
dnsMessage.Answers.Add(new ARecord
{
Name = $"{_hapId.Replace(":", "_")}.local",
Address = localAddress,
Class = DnsClass.IN,
Type = DnsType.A,
TTL = TimeSpan.FromMinutes(2)
});
}
else if (localAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
dnsMessage.Answers.Add(new AAAARecord
{
Name = $"{_hapId.Replace(":", "_")}.local",
Address = localAddress,
Class = DnsClass.IN,
Type = DnsType.AAAA,
TTL = TimeSpan.FromMinutes(2)
});
}
}
_mdns.SendAnswer(dnsMessage, e);
}
}
// Enforce multicast defaults, especially TTL.
static ServiceProfile()
{
// Make sure MulticastService is inited.
MulticastService.ReferenceEquals(null, null);
}
