//Enumerate all dcs with srv records
public static IEnumerable <string> EnumerateDCs(string domainDnsName, DsFlag flags)
{
IntPtr handle;
int result = NativeMethods.DsGetDcOpenW(domainDnsName, DsEnumerateOptions.None, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, flags, out handle);
if (result != 0)
{
ThrowNetApi(result);
}
try
{
IntPtr hostName;
while ((result = NativeMethods.DsGetDcNextW(handle, IntPtr.Zero, IntPtr.Zero, out hostName)) == 0)
{
yield return(Marshal.PtrToStringUni(hostName));
NativeMethods.NetApiBufferFree(hostName);
}
if (result != 259) //NoMoreItems
{
ThrowNetApi(result);
}
}
finally
{
NativeMethods.DsGetDcCloseW(handle);
}
}
public static extern int DsGetDcNameW(
string ComputerName,
string DomainName,
IntPtr DomainGuid,
IntPtr SiteName,
DsFlag Flags,
out IntPtr DomainControllerInfo);
public static extern int DsGetDcOpenW(
string DnsName,
DsEnumerateOptions options,
IntPtr SiteName,
IntPtr DomainGuid,
IntPtr DnsForestName,
DsFlag Flags,
out IntPtr GetDcContext);
//Get a dc in the domain
public static DOMAIN_CONTROLLER_INFO GetDc(string domainName, DsFlag flags, string computerNameToPerformSearch = null)
{
IntPtr returnValue;
int result = string.IsNullOrWhiteSpace(computerNameToPerformSearch) ? NativeMethods.DsGetDcNameW(IntPtr.Zero, domainName, IntPtr.Zero, IntPtr.Zero, flags, out returnValue) : NativeMethods.DsGetDcNameW(computerNameToPerformSearch, domainName, IntPtr.Zero, IntPtr.Zero, flags, out returnValue);
if (result != 0)
{
ThrowNetApi(result);
}
var dci = (DOMAIN_CONTROLLER_INFO)Marshal.PtrToStructure(returnValue, typeof(DOMAIN_CONTROLLER_INFO));
NativeMethods.NetApiBufferFree(returnValue);
return(dci);
}
