source3/modules/util_reparse.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Utility functions for reparse points.
   4  *
   5  * Copyright (C) Jeremy Allison 2018
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "includes.h"
  22 #include "util_reparse.h"
  23
  24 NTSTATUS fsctl_get_reparse_point(struct files_struct *fsp,
  25                                  TALLOC_CTX *mem_ctx,
  26                                  char **out_data,
  27                                  uint32_t max_out_len,
  28                                  uint32_t *out_len)
  29 {
  30         DBG_DEBUG("Called on %s\n", fsp_str_dbg(fsp));
  31         return NT_STATUS_NOT_A_REPARSE_POINT;
  32 }
  33
  34 static NTSTATUS check_reparse_data_buffer(
  35         const uint8_t *in_data, size_t in_len)
  36 {
  37         uint16_t reparse_data_length;
  38
  39         if (in_len == 0) {
  40                 DBG_DEBUG("in_len=0\n");
  41                 return NT_STATUS_INVALID_BUFFER_SIZE;
  42         }
  43         if (in_len < 8) {
  44                 DBG_DEBUG("in_len=%zu\n", in_len);
  45                 return NT_STATUS_IO_REPARSE_DATA_INVALID;
  46         }
  47
  48         reparse_data_length = PULL_LE_U16(in_data, 4);
  49
  50         if (reparse_data_length != (in_len - 8)) {
  51                 DBG_DEBUG("in_len=%zu, reparse_data_length=%"PRIu16"\n",
  52                           in_len,
  53                           reparse_data_length);
  54                 return NT_STATUS_IO_REPARSE_DATA_INVALID;
  55         }
  56
  57         return NT_STATUS_OK;
  58 }
  59
  60 NTSTATUS fsctl_set_reparse_point(struct files_struct *fsp,
  61                                  TALLOC_CTX *mem_ctx,
  62                                  const uint8_t *in_data,
  63                                  uint32_t in_len)
  64 {
  65         NTSTATUS status;
  66
  67         DBG_DEBUG("Called on %s\n", fsp_str_dbg(fsp));
  68
  69         status = check_reparse_data_buffer(in_data, in_len);
  70         if (!NT_STATUS_IS_OK(status)) {
  71                 return status;
  72         }
  73
  74         return NT_STATUS_NOT_A_REPARSE_POINT;
  75 }
  76
  77 NTSTATUS fsctl_del_reparse_point(struct files_struct *fsp,
  78                                  TALLOC_CTX *mem_ctx,
  79                                  const uint8_t *in_data,
  80                                  uint32_t in_len)
  81 {
  82         DBG_DEBUG("Called on %s\n", fsp_str_dbg(fsp));
  83         return NT_STATUS_NOT_A_REPARSE_POINT;
  84 }