Enumerating domains in a forest C#

[thund3rstruck]

Hi guys,

I've been plugging away at this for a few hours and it's really frustrating me. I have a requirement where I must enumerate domains (and all child domains) in a large forest where I do not know any details about the forest. The solution must be in C#.net 2005. I located a vbscript that worked ok but it must be in C#.

The part I am stuck on is objRootDSE = GetObject("LDAP://RootDSE") which has no equivelent in c#. I'm very firmiliar with System.DirectoryServices but it seems that using that one must specify a ldap path to bind to when creating the connection to the directoryEntry and this requirement dictates that I do not know any details about the forest or even what domain the machine/user is attached to.

I researched using IADs but I really have no clue as to how to functionally use that.

[thund3rstruck]

Well I had to go about it in a backwards sort of way but ultimately I had to formulate a query to locate the OU that stores the domain information, enumerate, compare and exstrapulate based on that .

So basically, I capture the user's friendly domain name based on their login ID (domain\username) and send that to this function that translates that friendly name into the fqdn which later on I use to get their group memberships

        private string GetDomainFqdn(string domainName)
        {            
            //Get the forest primary partition
            DirectoryEntry RootDSE = new DirectoryEntry("LDAP://RootDSE");
            DirectoryEntry ConfigContainer = new DirectoryEntry("LDAP://" +
                            RootDSE.Properties["configurationNamingContext"].Value);
            DirectorySearcher ConfigSearcher = new DirectorySearcher(ConfigContainer);
            //Get the distinguishedName for the primary partition
            ConfigSearcher.Filter = "(&(objectClass=crossRefContainer))";
            ConfigSearcher.PropertiesToLoad.Add("distinguishedName");
            ConfigSearcher.SearchScope = SearchScope.OneLevel;
            SearchResult result = ConfigSearcher.FindOne();
            string OUdn = result.Properties["distinguishedName"][0].ToString();
            string ldapPath = string.Empty;
 
            try
            {
                //Enumerate the primary partition table for domain children
                string bindGroup = "LDAP://" + OUdn;
                DirectoryEntry ent = new DirectoryEntry(bindGroup);
 
                foreach (DirectoryEntry child in ent.Children)
                {
                    //Match friendly domain name with FQDN domain partition location
                    string ldapMatch = System.Text.RegularExpressions.Regex.Match(child.Path.ToString(),
                            domainName, System.Text.RegularExpressions.RegexOptions.IgnoreCase).ToString();
 
                    if (ldapMatch != "")
                    {
                        //Found a match, fetch ldap domain distinguishedName 
                        ldapPath = child.Properties["nCName"].Value.ToString();
                    }
                    child.Close();
                    child.Dispose();
                }
                ent.Close();
                ent.Dispose();
             }
            catch (DirectoryServicesCOMException e)
            {
                _error = e.Message.ToString();
            }
 
            return ldapPath;
            this._ldapDomain = ldapPath;
        }