c# - 如何在复杂环境中使用FQDN获取NETBIOS域名

从完全限定的Active Directory域名中获取NETBIOS域名有时是一项繁琐的任务。我找到了一个很好的答案here。

但是，在具有多个林的环境中，如果PC不在您要查询的林中，则此方法将不起作用。这是因为LDAP://RootDSE将查询计算机域的信息。

有人可能会问:为什么这么复杂？只需在第一个点检索之前使用该名称即可:

ActiveDirectory.Domain.GetComputerDomain().Name;

或者只是获取用户的域名:

Environment.GetEnvironmentVariable("USERDOMAIN");

要么

Environment.UserDomainName;

但是NETBIOS域名可以完全不同，您或您的计算机可能位于不同的域或林中!因此，此方法仅在简单的环境中可用。

DJ KRAZE’s解决方案仅需进行少量修改即可允许跨域查询。这假定了信任关系!

private string GetNetbiosDomainName(string dnsDomainName)
{
      string netbiosDomainName = string.Empty;

      DirectoryEntry rootDSE = new DirectoryEntry(string.Format("LDAP://{0}/RootDSE",dnsDomainName));

      string configurationNamingContext = rootDSE.Properties["configurationNamingContext"][0].ToString();

      DirectoryEntry searchRoot = new DirectoryEntry("LDAP://cn=Partitions," + configurationNamingContext);

      DirectorySearcher searcher = new DirectorySearcher(searchRoot);
      searcher.SearchScope = SearchScope.OneLevel;
      searcher.PropertiesToLoad.Add("netbiosname");
      searcher.Filter = string.Format("(&(objectcategory=Crossref)(dnsRoot={0})(netBIOSName=*))", dnsDomainName);

      SearchResult result = searcher.FindOne();

      if (result != null)
      {
        netbiosDomainName = result.Properties["netbiosname"][0].ToString();
      }

      return netbiosDomainName;
    }

最佳答案

您还可以使用DsGetDcName API，它将为您完成所有工作。如果您查询的域是本地计算机，它还将缓存 call ，甚至不会打入网络。

如果您对

使用:

internal static string GetNetbiosNameForDomain(string dns)
{
    IntPtr pDomainInfo;
    int result = DsGetDcName(null, dns, IntPtr.Zero, null,
        DSGETDCNAME_FLAGS.DS_IS_DNS_NAME | DSGETDCNAME_FLAGS.DS_RETURN_FLAT_NAME,
        out pDomainInfo);
    try
    {
        if (result != ERROR_SUCCESS)
            throw new Win32Exception(result);

        var dcinfo = new DomainControllerInfo();
        Marshal.PtrToStructure(pDomainInfo, dcinfo);

        return dcinfo.DomainName;
    }
    finally
    {
        if (pDomainInfo != IntPtr.Zero)
            NetApiBufferFree(pDomainInfo);
    }
}

P /调用:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
private class DomainControllerInfo
{
    public string DomainControllerName;
    public string DomainControllerAddress;
    public int DomainControllerAddressType;
    public Guid DomainGuid;
    public string DomainName;
    public string DnsForestName;
    public int Flags;
    public string DcSiteName;
    public string ClientSiteName;
}

[Flags]
private 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
}

[DllImport("Netapi32.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "DsGetDcNameW", CharSet = CharSet.Unicode)]
private static extern int DsGetDcName(
    [In] string computerName,
    [In] string domainName,
    [In] IntPtr domainGuid,
    [In] string siteName,
    [In] DSGETDCNAME_FLAGS flags,
    [Out] out IntPtr domainControllerInfo);

[DllImport("Netapi32.dll")]
private static extern int NetApiBufferFree(
    [In] IntPtr buffer);

private const int ERROR_SUCCESS = 0;

关于c# - 如何在复杂环境中使用FQDN获取NETBIOS域名，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14119753/