using System;
using System.Collections;
using System.Runtime.InteropServices;

namespace ServerEnum
{
  internal class Class1 
  {
    [DllImport("netapi32.dll", EntryPoint="NetServerEnum")]
    public static extern NERR NetServerEnum (
           [MarshalAs(UnmanagedType.LPWStr)] string ServerName, 
           int Level, out IntPtr BufPtr, int PrefMaxLen, 
           ref int EntriesRead, ref int TotalEntries, 
           SV_101_TYPES ServerType,
           [MarshalAs(UnmanagedType.LPWStr)] string Domain, 
           int ResumeHandle);

    [DllImport("netapi32.dll", EntryPoint="NetApiBufferFree")]
    public static extern NERR NetApiBufferFree (IntPtr Buffer);

    //
    // типы серверов
    //
    [Flags]
    public enum SV_101_TYPES : uint 
    {
      SV_TYPE_WORKSTATION       = 0x00000001,
      SV_TYPE_SERVER            = 0x00000002,
      SV_TYPE_SQLSERVER         = 0x00000004,
      SV_TYPE_DOMAIN_CTRL       = 0x00000008,
      SV_TYPE_DOMAIN_BAKCTRL    = 0x00000010,
      SV_TYPE_TIME_SOURCE       = 0x00000020,
      SV_TYPE_AFP               = 0x00000040,
      SV_TYPE_NOVELL            = 0x00000080,
      SV_TYPE_DOMAIN_MEMBER     = 0x00000100,
      SV_TYPE_PRINTQ_SERVER     = 0x00000200,
      SV_TYPE_DIALIN_SERVER     = 0x00000400,
      SV_TYPE_XENIX_SERVER      = 0x00000800,
      SV_TYPE_SERVER_UNIX       = SV_TYPE_XENIX_SERVER,
      SV_TYPE_NT                = 0x00001000,
      SV_TYPE_WFW               = 0x00002000,
      SV_TYPE_SERVER_MFPN       = 0x00004000,
      SV_TYPE_SERVER_NT         = 0x00008000,
      SV_TYPE_POTENTIAL_BROWSER = 0x00010000,
      SV_TYPE_BACKUP_BROWSER    = 0x00020000,
      SV_TYPE_MASTER_BROWSER    = 0x00040000,
      SV_TYPE_DOMAIN_MASTER     = 0x00080000,
      SV_TYPE_SERVER_OSF        = 0x00100000,
      SV_TYPE_SERVER_VMS        = 0x00200000,
      SV_TYPE_WINDOWS           = 0x00400000,
      SV_TYPE_DFS               = 0x00800000,
      SV_TYPE_CLUSTER_NT        = 0x01000000,
      SV_TYPE_TERMINALSERVER    = 0x02000000,
      SV_TYPE_CLUSTER_VS_NT     = 0x04000000,
      SV_TYPE_DCE               = 0x10000000,
      SV_TYPE_ALTERNATE_XPORT   = 0x20000000,
      SV_TYPE_LOCAL_LIST_ONLY   = 0x40000000,
      SV_TYPE_DOMAIN_ENUM       = 0x80000000,
      SV_TYPE_ALL               = 0xFFFFFFFF,
    }

    [StructLayout(LayoutKind.Sequential)]
      public struct SERVER_INFO_101 
    {
      [MarshalAs(UnmanagedType.U4)] public uint sv101_platform_id;
      [MarshalAs(UnmanagedType.LPWStr)] public string sv101_name;
      [MarshalAs(UnmanagedType.U4)] public uint sv101_version_major;
      [MarshalAs(UnmanagedType.U4)] public uint sv101_version_minor;
      [MarshalAs(UnmanagedType.U4)] public uint sv101_type;
      [MarshalAs(UnmanagedType.LPWStr)] public string sv101_comment;
    }

    //
    // оперционная система
    //
    public enum PLATFORM_ID : uint 
    {
      PLATFORM_ID_DOS = 300,
      PLATFORM_ID_OS2 = 400,
      PLATFORM_ID_NT  = 500,
      PLATFORM_ID_OSF = 600,
      PLATFORM_ID_VMS = 700,
    }

    //
    // список ошибок, возвращаемых NetServerEnum
    //        
    public enum NERR 
    {
      NERR_Success                   = 0, // Успех
      ERROR_ACCESS_DENIED            = 5,
      ERROR_NOT_ENOUGH_MEMORY        = 8,
      ERROR_BAD_NETPATH              = 53,
      ERROR_NETWORK_BUSY             = 54,
      ERROR_INVALID_PARAMETER        = 87,
      ERROR_INVALID_LEVEL            = 124,
      ERROR_MORE_DATA                = 234,
      ERROR_EXTENDED_ERROR           = 1208,
      ERROR_NO_NETWORK               = 1222,
      ERROR_INVALID_HANDLE_STATE     = 1609,
      ERROR_NO_BROWSER_SERVERS_FOUND = 6118,
    }

    public static ArrayList GetServerList(SV_101_TYPES type) 
    {
      SERVER_INFO_101 si;
      IntPtr pInfo      = IntPtr.Zero;
      int etriesread   = 0;
      int totalentries = 0;
      ArrayList srvs   = new ArrayList();

      try 
      {
        NERR err = NetServerEnum(null, 101, out pInfo, -1, 
             ref etriesread, ref totalentries, type, null, 0);
        if ((err == NERR.NERR_Success || 
                      err == NERR.ERROR_MORE_DATA) && 
                      pInfo != IntPtr.Zero) 
        {
          int ptr = pInfo.ToInt32();
          for (int i = 0; i < etriesread; i++) 
          {
            si = (SERVER_INFO_101) Marshal.PtrToStructure(
                       new IntPtr(ptr), typeof (SERVER_INFO_101));
            srvs.Add(si.sv101_name); // добавляем имя 
                                     // сервера в список
            ptr += Marshal.SizeOf(si);
          }
        }
      } 
      catch (Exception) 
      { 
      } 
      finally 
      { // освобождаем выделенную память
        if (pInfo != IntPtr.Zero) 
        {
          NetApiBufferFree(pInfo);
        }
      }
      return (srvs);
    }

    [STAThread]
    static void Main() 
    {
      Console.WriteLine("{0} WORKSTATION", new string('=', 10));
      ArrayList list =
                 GetServerList(SV_101_TYPES.SV_TYPE_WORKSTATION);
      foreach (string name in list) 
      {
        Console.WriteLine(name);  
      }
      Console.WriteLine("{0} UNIX", new string('=', 10));
      list = GetServerList(SV_101_TYPES.SV_TYPE_SERVER_UNIX);
      foreach (string name in list)
      {
        Console.WriteLine(name);  
      }
    }
  }
}