source3/smbd/srvstr.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    server specific string routines
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
   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 "smbd/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "lib/util/string_wrappers.h"
  25
  26 /* Make sure we can't write a string past the end of the buffer */
  27
  28 NTSTATUS srvstr_push_fn(const char *base_ptr, uint16_t smb_flags2, void *dest,
  29                       const char *src, int dest_len, int flags, size_t *ret_len)
  30 {
  31         size_t len;
  32         int saved_errno;
  33         NTSTATUS status;
  34
  35         if (dest_len < 0) {
  36                 return NT_STATUS_INVALID_PARAMETER;
  37         }
  38
  39         saved_errno = errno;
  40         errno = 0;
  41
  42         /* 'normal' push into size-specified buffer */
  43         len = push_string_base(base_ptr, smb_flags2, dest, src,
  44                                 dest_len, flags);
  45
  46         if (errno != 0) {
  47                 /*
  48                  * Special case E2BIG, EILSEQ, EINVAL
  49                  * as they mean conversion errors here,
  50                  * but we don't generically map them as
  51                  * they can mean different things in
  52                  * generic filesystem calls (such as
  53                  * read xattrs).
  54                  */
  55                 if (errno == E2BIG || errno == EILSEQ || errno == EINVAL) {
  56                         status = NT_STATUS_ILLEGAL_CHARACTER;
  57                 } else {
  58                         status = map_nt_error_from_unix_common(errno);
  59                         /*
  60                          * Paranoia - Filter out STATUS_MORE_ENTRIES.
  61                          * I don't think we can get this but it has a
  62                          * specific meaning to the client.
  63                          */
  64                         if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
  65                                 status = NT_STATUS_UNSUCCESSFUL;
  66                         }
  67                 }
  68                 DEBUG(10,("character conversion failure "
  69                         "on string (%s) (%s)\n",
  70                         src, strerror(errno)));
  71         } else {
  72                 /* Success - restore untouched errno. */
  73                 errno = saved_errno;
  74                 *ret_len = len;
  75                 status = NT_STATUS_OK;
  76         }
  77         return status;
  78 }