/// <summary>
/// Asynchronously returns a collection of IPHostEntries of all computers found in the NetworkNeighborhood
/// </summary>
/// <returns></returns>
private async Task <ICollection <IPHostEntry> > DoGetHostsAsync()
{
var stopWatch = System.Diagnostics.Stopwatch.StartNew();
var networks = NetworkUtils.GetAllLocalIPv4Networks();
ServiceRegistration.Get <ILogger>().Debug("NetbiosNameServiceNeighborhoodBrowser: Found {0} local IPv4 network(s) with IP address(es) {1}", networks.Count, String.Join(" / ", networks.Select(i => i.Address + " (" + i.IPv4Mask + ")")));
networks = RemoveLargeSubnets(networks);
ServiceRegistration.Get <ILogger>().Debug("NetbiosNameServiceNeighborhoodBrowser: {0} local IPv4 network(s) are used: {1}", networks.Count, String.Join(" / ", networks.Select(i => i.Address + " (" + i.IPv4Mask + ")")));
var tasks = new Dictionary <IPAddress, Task <NbNsNodeStatusResponse> >();
using (var client = new NbNsClient())
{
foreach (var target in networks.SelectMany(NetworkUtils.GetAllAddressesInSubnet))
{
if (!tasks.ContainsKey(target))
{
tasks.Add(target, client.SendUnicastNodeStatusRequestAsync(NbNsNodeStatusRequest.WildCardNodeStatusRequest, target));
}
}
await Task.WhenAll(tasks.Values);
// Uncomment the following two lines for extensive logging
// foreach (var kvp in tasks.Where(kvp => kvp.Value.Result != null))
// ServiceRegistration.Get<ILogger>().Debug("NetbiosNameServiceNeighborhoodBrowser: Found {0} ({1})\r\n{2}", kvp.Value.Result.WorkstationName, kvp.Key, kvp.Value.Result);
}
// If the computer has multiple network interfaces, it is found multiple times - once for each network interface.
// Every occurence of the computer then has a different IP address (the one of the respective network interface).
// As result we want this computer only as one IPHostEntry, but IPHostEntry.AddressList should show all IP addresses.
var result = new HashSet <IPHostEntry>();
var responses = tasks.Where(kvp => kvp.Value.Result != null);
foreach (var kvp in responses)
{
var alreadyPresentHost = result.FirstOrDefault(host => host.HostName == kvp.Value.Result.WorkstationName);
if (alreadyPresentHost == null)
{
result.Add(new IPHostEntry {
AddressList = new[] { kvp.Key }, HostName = kvp.Value.Result.WorkstationName
});
}
else
{
if (!alreadyPresentHost.AddressList.Any(address => address.Equals(kvp.Key)))
{
alreadyPresentHost.AddressList = alreadyPresentHost.AddressList.Union(new[] { kvp.Key }).ToArray();
}
}
}
NeighborhoodBrowserHelper.LogResult(result, GetType().Name, stopWatch.ElapsedMilliseconds);
return(result);
}
/// <summary>
/// Asynchronously returns a collection of IPHostEntries of all computers found in the NetworkNeighborhood
/// </summary>
/// <returns></returns>
private async Task<ICollection<IPHostEntry>> DoGetHostsAsync()
{
var stopWatch = System.Diagnostics.Stopwatch.StartNew();
var networks = NetworkUtils.GetAllLocalIPv4Networks();
ServiceRegistration.Get<ILogger>().Debug("NetbiosNameServiceNeighborhoodBrowser: Found {0} local IPv4 network(s) with IP address(es) {1}", networks.Count, String.Join(" / ", networks.Select(i => i.Address + " (" + i.IPv4Mask + ")")));
networks = RemoveLargeSubnets(networks);
ServiceRegistration.Get<ILogger>().Debug("NetbiosNameServiceNeighborhoodBrowser: {0} local IPv4 network(s) are used: {1}", networks.Count, String.Join(" / ", networks.Select(i => i.Address + " (" + i.IPv4Mask + ")")));
var tasks = new Dictionary<IPAddress, Task<NbNsNodeStatusResponse>>();
using (var client = new NbNsClient())
{
foreach (var target in networks.SelectMany(NetworkUtils.GetAllAddressesInSubnet))
tasks.Add(target, client.SendUnicastNodeStatusRequestAsync(NbNsNodeStatusRequest.WildCardNodeStatusRequest, target));
await Task.WhenAll(tasks.Values);
// Uncomment the following two lines for extensive logging
// foreach (var kvp in tasks.Where(kvp => kvp.Value.Result != null))
// ServiceRegistration.Get<ILogger>().Debug("NetbiosNameServiceNeighborhoodBrowser: Found {0} ({1})\r\n{2}", kvp.Value.Result.WorkstationName, kvp.Key, kvp.Value.Result);
}
// If the computer has multiple network interfaces, it is found multiple times - once for each network interface.
// Every occurence of the computer then has a different IP address (the one of the respective network interface).
// As result we want this computer only as one IPHostEntry, but IPHostEntry.AddressList should show all IP addresses.
var result = new HashSet<IPHostEntry>();
var responses = tasks.Where(kvp => kvp.Value.Result != null);
foreach (var kvp in responses)
{
var alreadyPresentHost = result.FirstOrDefault(host => host.HostName == kvp.Value.Result.WorkstationName);
if (alreadyPresentHost == null)
result.Add(new IPHostEntry { AddressList = new[] { kvp.Key }, HostName = kvp.Value.Result.WorkstationName });
else
{
if (!alreadyPresentHost.AddressList.Any(address => address.Equals(kvp.Key)))
alreadyPresentHost.AddressList = alreadyPresentHost.AddressList.Union(new[] { kvp.Key }).ToArray();
}
}
NeighborhoodBrowserHelper.LogResult(result, GetType().Name, stopWatch.ElapsedMilliseconds);
return result;
}