Created
March 11, 2023 16:41
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This script shows how to use a Win32 function (GetDcName) from PowerShell.
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$code = @' | |
using System; | |
using System.Collections.Generic; | |
using System.ComponentModel; | |
using System.Linq; | |
using System.Runtime.InteropServices; | |
using System.Text; | |
using System.Threading.Tasks; | |
namespace Test | |
{ | |
public class AD | |
{ | |
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] | |
public struct DOMAIN_CONTROLLER_INFO | |
{ | |
[MarshalAs(UnmanagedType.LPTStr)] | |
public string DomainControllerName; | |
[MarshalAs(UnmanagedType.LPTStr)] | |
public string DomainControllerAddress; | |
public uint DomainControllerAddressType; | |
public Guid DomainGuid; | |
[MarshalAs(UnmanagedType.LPTStr)] | |
public string DomainName; | |
[MarshalAs(UnmanagedType.LPTStr)] | |
public string DnsForestName; | |
public uint Flags; | |
[MarshalAs(UnmanagedType.LPTStr)] | |
public string DcSiteName; | |
[MarshalAs(UnmanagedType.LPTStr)] | |
public string ClientSiteName; | |
} | |
[DllImport("Netapi32.dll", CharSet = CharSet.Auto, SetLastError = true)] | |
public static extern int DsGetDcName | |
( | |
[MarshalAs(UnmanagedType.LPTStr)] | |
string ComputerName, | |
[MarshalAs(UnmanagedType.LPTStr)] | |
string DomainName, | |
[In] int DomainGuid, | |
[MarshalAs(UnmanagedType.LPTStr)] | |
string SiteName, | |
[MarshalAs(UnmanagedType.U4)] | |
DSGETDCNAME_FLAGS flags, | |
out IntPtr pDOMAIN_CONTROLLER_INFO | |
); | |
[DllImport("Netapi32.dll", SetLastError = true)] | |
public static extern int NetApiBufferFree(IntPtr Buffer); | |
[Flags] | |
public enum DSGETDCNAME_FLAGS : uint | |
{ | |
DS_FORCE_REDISCOVERY = 0x00000001, | |
DS_DIRECTORY_SERVICE_REQUIRED = 0x00000010, | |
DS_DIRECTORY_SERVICE_PREFERRED = 0x00000020, | |
DS_GC_SERVER_REQUIRED = 0x00000040, | |
DS_PDC_REQUIRED = 0x00000080, | |
DS_BACKGROUND_ONLY = 0x00000100, | |
DS_IP_REQUIRED = 0x00000200, | |
DS_KDC_REQUIRED = 0x00000400, | |
DS_TIMESERV_REQUIRED = 0x00000800, | |
DS_WRITABLE_REQUIRED = 0x00001000, | |
DS_GOOD_TIMESERV_PREFERRED = 0x00002000, | |
DS_AVOID_SELF = 0x00004000, | |
DS_ONLY_LDAP_NEEDED = 0x00008000, | |
DS_IS_FLAT_NAME = 0x00010000, | |
DS_IS_DNS_NAME = 0x00020000, | |
DS_RETURN_DNS_NAME = 0x40000000, | |
DS_RETURN_FLAT_NAME = 0x80000000 | |
} | |
public DOMAIN_CONTROLLER_INFO GetDomainInfo() | |
{ | |
DOMAIN_CONTROLLER_INFO domainInfo; | |
const int ERROR_SUCCESS = 0; | |
IntPtr pDCI = IntPtr.Zero; | |
try | |
{ | |
int val = DsGetDcName("", "", 0, "", | |
DSGETDCNAME_FLAGS.DS_DIRECTORY_SERVICE_REQUIRED | | |
DSGETDCNAME_FLAGS.DS_RETURN_DNS_NAME | | |
DSGETDCNAME_FLAGS.DS_IP_REQUIRED, out pDCI); | |
//check return value for error | |
if (ERROR_SUCCESS == val) | |
{ | |
domainInfo = (DOMAIN_CONTROLLER_INFO)Marshal.PtrToStructure(pDCI, typeof(DOMAIN_CONTROLLER_INFO)); | |
string msg = "Forest : " + domainInfo.DnsForestName + "\r\n"; | |
msg += "DC-Site: " + domainInfo.DomainControllerName + "\r\n"; | |
msg += " Client: " + domainInfo.ClientSiteName + "\r\n"; | |
Console.WriteLine(msg); | |
} | |
else | |
{ | |
throw new Win32Exception(val); | |
} | |
} | |
finally | |
{ | |
NetApiBufferFree(pDCI); | |
} | |
return domainInfo; | |
} | |
} | |
} | |
'@ | |
Add-Type -TypeDefinition $code | |
$ERROR_SUCCESS = 0; | |
[IntPtr]$pDCI = [IntPtr]::Zero | |
try { | |
$flags = [Test.AD+DSGETDCNAME_FLAGS]::DS_DIRECTORY_SERVICE_REQUIRED -bor [Test.AD+DSGETDCNAME_FLAGS]::DS_RETURN_DNS_NAME -bor [Test.AD+DSGETDCNAME_FLAGS]::DS_IP_REQUIRED | |
$val = [Test.AD]::DsGetDcName('', '', 0, '', $flags, [ref]$pDCI); | |
if ($ERROR_SUCCESS -eq $val) | |
{ | |
$domainInfo = [Test.AD+DOMAIN_CONTROLLER_INFO][System.Runtime.InteropServices.Marshal]::PtrToStructure($pDCI, [type][Test.AD+DOMAIN_CONTROLLER_INFO]) | |
Write-Host "Forest: $($domainInfo.DnsForestName)" | |
Write-Host "DC-Site: $($domainInfo.DomainControllerName)" | |
Write-Host "Client: $($domainInfo.ClientSiteName)" | |
} | |
else | |
{ | |
$ex = [System.ComponentModel.Win32Exception]::new($val) | |
Write-Error -Exception $ex | |
} | |
} | |
finally | |
{ | |
[void][Test.AD]::NetApiBufferFree($pDCI) | |
} | |
$domainInfo |
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