/// <summary>
/// Stop the service.
/// </summary>
/// <remarks>
/// Clears all the event handlers.
/// </remarks>
public void Stop()
{
// All event handlers are cleared.
QueryReceived = null;
AnswerReceived = null;
NetworkInterfaceDiscovered = null;
// Stop current UDP listener
client?.Dispose();
client = null;
}
void FindNetworkInterfaces()
{
log.Debug("Finding network interfaces");
try
{
var currentNics = GetLinkLocalAddresses().ToList();
var newNics = new List <IPAddress>();
var oldNics = new List <IPAddress>();
foreach (var nic in knownIPs?.Where(k => !currentNics.Any(n => k.Equals(n))))
{
oldNics.Add(nic);
if (log.IsDebugEnabled)
{
log.Debug($"Removed ip '{nic}'.");
}
}
foreach (var nic in currentNics.Where(nic => !knownIPs.Any(k => k.Equals(nic))))
{
newNics.Add(nic);
if (log.IsDebugEnabled)
{
log.Debug($"Found ip '{nic}'.");
}
}
knownIPs = currentNics;
// Only create client if something has changed.
if (newNics.Any() || oldNics.Any())
{
client?.Dispose();
client = new MulticastClient(UseIpv4, UseIpv6, knownIPs);
client.MessageReceived += OnDnsMessage;
}
// Tell others.
if (newNics.Any())
{
NetworkInterfaceDiscovered?.Invoke(this, new IPEventArgs
{
NetworkInterfaces = newNics
});
}
// Magic from @eshvatskyi
//
// I've seen situation when NetworkAddressChanged is not triggered
// (wifi off, but NIC is not disabled, wifi - on, NIC was not changed
// so no event). Rebinding fixes this.
//
// Do magic only on Windows.
#if NET461
if (Environment.OSVersion.Platform.ToString().StartsWith("Win"))
#else
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
#endif
{
NetworkChange.NetworkAddressChanged -= OnNetworkAddressChanged;
NetworkChange.NetworkAddressChanged += OnNetworkAddressChanged;
}
}
catch (Exception e)
{
log.Error("FindNics failed", e);
}
}