/// <summary>
/// Asynchronous callback that processes changes from Active Directory.
/// </summary>
/// <param name="asyncResult">Result of permanens search</param>
private void RunAsyncSearch(IAsyncResult asyncResult)
{
var results = new List <SearchResultEntry>();
// Get changes
if (!asyncResult.IsCompleted)
{
PartialResultsCollection partialResults = null;
try
{
partialResults = Connection.GetPartialResults(asyncResult);
}
catch (Exception e)
{
LogError("Retrieving partial results from Active Directory asynchronous search failed.", e);
}
if (partialResults != null)
{
// Add only users and groups
results.AddRange(partialResults.OfType <SearchResultEntry>().Where(p => LdapHelper.IsUser(p, PersonObjectCategory) || LdapHelper.IsGroup(p, GroupObjectCategory)));
}
}
else
{
LogMessage("The change notification control unexpectedly ended the search.");
mSearches.Remove(asyncResult);
StartIncrementalSynchronization();
}
// Send changes to CMS
Dispatcher.AddToQueue(results);
}
private void Notify(IAsyncResult result)
{
lock (this.lockObject)
{
try
{
if (this.stopped)
{
this.connection?.EndSendRequest(result);
return;
}
PartialResultsCollection resultsCollection = this.connection?.GetPartialResults(result);
if (resultsCollection == null)
{
this.Trace("Results collection was empty");
return;
}
if (DateTime.Now < this.nextTriggerAfter)
{
//this.Trace("Discarding change because next trigger time has not been reached");
return;
}
DateTime lastLogonOldestDate = DateTime.UtcNow.Subtract(this.LastLogonTimestampOffset);
foreach (SearchResultEntry r in resultsCollection.OfType <SearchResultEntry>())
{
if (r.Attributes == null || !r.Attributes.Contains(ActiveDirectoryChangeTrigger.ObjectClassAttribute))
{
this.Trace($"Skipping entry {r.DistinguishedName} because the object class list was empty");
continue;
}
IList <string> objectClasses = r.Attributes[ActiveDirectoryChangeTrigger.ObjectClassAttribute].GetValues(typeof(string)).OfType <string>().ToList();
if (!this.ObjectClasses.Intersect(objectClasses, StringComparer.OrdinalIgnoreCase).Any())
{
continue;
}
if (objectClasses.Contains("computer", StringComparer.OrdinalIgnoreCase) && !this.ObjectClasses.Contains("computer", StringComparer.OrdinalIgnoreCase))
{
continue;
}
bool dateTooSoon = false;
foreach (string timestampAttribute in ActiveDirectoryChangeTrigger.TimeStampAttributesToIgnore)
{
if (r.Attributes.Contains(timestampAttribute))
{
string ts = r.Attributes[timestampAttribute][0] as string;
DateTime date1 = DateTime.FromFileTimeUtc(Convert.ToInt64(ts));
if (date1 > lastLogonOldestDate)
{
dateTooSoon = true;
break;
}
}
}
if (dateTooSoon)
{
continue;
}
this.Log($"Change detected on {r.DistinguishedName}");
this.Fire();
}
}
catch (LdapException ex)
{
if (ex.ErrorCode == 85)
{
this.SetupListener();
}
else
{
this.LogError("The AD change listener encountered an unexpected error", ex);
if (MessageSender.CanSendMail())
{
string messageContent = MessageBuilder.GetMessageBody(this.ManagementAgentName, this.Type, this.Description, DateTime.Now, false, ex);
MessageSender.SendMessage($"{this.ManagementAgentName}: {this.Type} trigger error", messageContent);
Thread.Sleep(1000);
}
}
}
catch (Exception ex)
{
this.LogError("The AD change listener encountered an unexpected error", ex);
if (MessageSender.CanSendMail())
{
string messageContent = MessageBuilder.GetMessageBody(this.ManagementAgentName, this.Type, this.Description, DateTime.Now, false, ex);
MessageSender.SendMessage($"{this.ManagementAgentName}: {this.Type} trigger error", messageContent);
Thread.Sleep(1000);
}
}
}
}