/// <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 = Stopwatch.StartNew();
// Enumerate all computers in the NetworkNeighborhood for all Domains / Workgroups
var hosts = new Dictionary <String, Task <IPHostEntry> >();
ICollection <String> hostNames;
// The WNetEnum API requires at least to be impersonated as NetworkService; this is the fallback credential used for
// the root path of NetworkNeighborhoodResourceProvider if no other credentials have been entered.
using (ServiceRegistration.Get <IImpersonationService>().CheckImpersonationFor(NetworkNeighborhoodResourceProvider.RootPath))
hostNames = NetworkResourcesEnumerator.EnumerateResources(ResourceScope.GlobalNet, ResourceType.Disk, ResourceUsage.All, ResourceDisplayType.Server);
// The hostNames returned by the NetworkResourceEnumerator are in the form \\COMPUTERNAME
// We have to remove the leading \\ to be able to pass the hostName to GetHostEntryAsync
foreach (var hostName in hostNames)
{
hosts[hostName.Substring(2)] = Dns.GetHostEntryAsync(hostName.Substring(2));
}
// Wait until an IPHostEntry was found for all computers
try
{
await Task.WhenAll(hosts.Values);
}
catch (Exception e)
{
ServiceRegistration.Get <ILogger>().Error("WNetEnumNeighborhoodBrowser: Error while getting IPHostEntries", e.Message);
}
// Assemble the result
var result = new HashSet <IPHostEntry>();
foreach (var kvp in hosts)
{
// If the call to GetHostEntryAsync was successful, we return the retrieved IPHostEntry
// If not, we return a new IPHostEntry object just with its HostName property set.
var host = kvp.Value.IsFaulted ? new IPHostEntry {
HostName = kvp.Key
} : kvp.Value.Result;
NeighborhoodBrowserHelper.ConvertDnsHostNameToNetBiosName(host);
result.Add(host);
}
NeighborhoodBrowserHelper.LogResult(result, GetType().Name, stopWatch.ElapsedMilliseconds);
return(result);
}
public ICollection <IFileSystemResourceAccessor> GetChildDirectories()
{
if (_path == "/")
{
return(NetworkResourcesEnumerator.EnumerateResources(ResourceScope.GlobalNet, ResourceType.Disk,
ResourceUsage.All, ResourceDisplayType.Server).Select(
serverName => new NetworkNeighborhoodResourceAccessor(
_parent, StringUtils.CheckPrefix(serverName, @"\\").Replace('\\', '/'))).Cast <IFileSystemResourceAccessor>().ToList());
}
if (IsServerPath(_path))
{
return(SharesEnumerator.EnumerateShares(StringUtils.RemovePrefixIfPresent(_path, "//")).Where(
share => share.ShareType == ShareType.Disk).Select(
share => {
try { return new NetworkNeighborhoodResourceAccessor(_parent, share.UNCPath.Replace('\\', '/')); }
catch (IllegalCallException) { return null; }
}
).Where(share => share != null).Cast <IFileSystemResourceAccessor>().ToList());
}
return(_underlayingResource == null ? null : WrapLocalFsResourceAccessors(_underlayingResource.GetChildDirectories()));
}
