Classify NTFS paths via DFS metadata

LiamNtfs/C4IT_IAM_SET/cNetworkConnection.cs

@@ -101,6 +101,35 @@ namespace C4IT_IAM
             }
         }
 
+        public static bool TryGetDfsEntryPath(string dfsEntryPath, out string entryPath)
+        {
+            entryPath = string.Empty;
+            if (string.IsNullOrWhiteSpace(dfsEntryPath))
+                return false;
+
+            IntPtr buffer = IntPtr.Zero;
+            try
+            {
+                int result = NetDfsGetInfo(dfsEntryPath, null, null, 1, ref buffer);
+                if (result != NERR_Success || buffer == IntPtr.Zero)
+                    return false;
+
+                DFS_INFO_1 info = (DFS_INFO_1)Marshal.PtrToStructure(buffer, typeof(DFS_INFO_1));
+                entryPath = info.EntryPath ?? dfsEntryPath;
+                return !string.IsNullOrWhiteSpace(entryPath);
+            }
+            catch (Exception ex)
+            {
+                DefaultLogger.LogException(ex);
+                return false;
+            }
+            finally
+            {
+                if (buffer != IntPtr.Zero)
+                    NetApiBufferFree(buffer);
+            }
+        }
+
         [DllImport("mpr.dll")]
         private static extern int WNetAddConnection2(NetResource netResource,
             string password, string username, int flags);
@@ -123,6 +152,15 @@ namespace C4IT_IAM
              ref int resume_handle
              );
 
+        [DllImport("Netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+        private static extern int NetDfsGetInfo(
+             string DfsEntryPath,
+             string ServerName,
+             string ShareName,
+             int Level,
+             ref IntPtr Buffer
+             );
+
     }
 
     [StructLayout(LayoutKind.Sequential)]
@@ -205,4 +243,10 @@ namespace C4IT_IAM
             return shi1_netname;
         }
     }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+    public struct DFS_INFO_1
+    {
+        public string EntryPath;
+    }
 }