private string GetDomainController(string server, string domainDns, DsGetDcNameFlags flags, ref DcLocatorMode mode)
{
string key = BuildDcCacheKey(server, domainDns, flags);
DcLocatorMode mode2 = mode;
try
{
if (flags.HasFlag(DsGetDcNameFlags.DS_FORCE_REDISCOVERY))
{
return(dcCache.AddOrUpdate(
key,
a => this.GetDc(server, domainDns, flags, ref mode2),
(a, b) =>
{
this.logger.LogTrace("New DC requested");
return this.GetDc(server, domainDns, flags, ref mode2);
}));
}
return(dcCache.GetOrAdd(key, k => this.GetDc(server, domainDns, flags, ref mode2)));
}
finally
{
mode = mode2;
}
}
public string GetDc(string server, string domainDns, DsGetDcNameFlags flags, ref DcLocatorMode mode)
{
string dc;
if (server != null)
{
bool hadNextClosestSite = flags.HasFlag(DsGetDcNameFlags.DS_TRY_NEXTCLOSEST_SITE);
if (mode.HasFlag(DcLocatorMode.RemoteDcLocator))
{
try
{
flags |= DsGetDcNameFlags.DS_TRY_NEXTCLOSEST_SITE;
this.logger.LogTrace("Remote DCLocator: Finding domain controller for server {server}, domain {domainDns} with flags {flags}", server, domainDns, flags.ToString());
dc = NativeMethods.GetDomainControllerForDnsDomain(server, domainDns, null, flags);
this.logger.LogTrace("Remote DCLocator: Found DC {dc} for server {server} in domain {domainDns}, with flags {flags}", dc, server, domainDns, flags.ToString());
return(dc);
}
catch (DirectoryException dex) //when (dex.InnerException is Win32Exception wex && wex.NativeErrorCode == 1722)
{
mode &= ~DcLocatorMode.RemoteDcLocator;
this.logger.LogWarning(dex, "Could not connect to server {server} to find DC", server);
}
}
if (!hadNextClosestSite)
{
flags &= ~DsGetDcNameFlags.DS_TRY_NEXTCLOSEST_SITE;
}
if (mode.HasFlag(DcLocatorMode.SiteLookup))
{
this.logger.LogTrace("Manual DCLocator: Finding site for server {server}, domain {domainDns} with flags {flags}", server, domainDns, flags.ToString());
string site = this.GetComputerSiteNameManual(domainDns, server);
if (site != null)
{
try
{
this.logger.LogTrace("Manual DCLocator: Attempting to find domain controller for site {site}, in domain {domainDns} with flags {flags}", site, domainDns, flags.ToString());
dc = NativeMethods.GetDomainControllerForDnsDomain(null, domainDns, site, flags);
this.logger.LogTrace("Manual DCLocator: Found DC {dc} for site {site} in domain {domainDns}, with flags {flags}", dc, site, domainDns, flags.ToString());
return(dc);
}
catch (DirectoryException dex) when(dex.InnerException is Win32Exception wex && wex.NativeErrorCode == 1355)
{
mode &= ~DcLocatorMode.SiteLookup;
this.logger.LogWarning(dex, "There are no domain controllers in the site {site}", site);
}
}
else
{
this.logger.LogTrace("Manual DCLocator: No site found for server {server}", server);
}
}
}
this.logger.LogTrace("Local DCLocator: Finding domain controller for domain {domainDns} with flags {flags}", domainDns, flags.ToString());
dc = NativeMethods.GetDomainControllerForDnsDomain(null, domainDns, null, flags);
this.logger.LogTrace("Local DCLocator: Found DC {dc} for domain {domainDns}, with flags {flags}", dc, domainDns, flags.ToString());
return(dc);
}