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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23 extern int max_send;
  24
  25 /* Make sure we can't write a string past the end of the buffer */
  26
  27 size_t srvstr_push_fn(const char *function, unsigned int line,
  28                       const char *base_ptr, void *dest,
  29                       const char *src, int dest_len, int flags)
  30 {
  31         size_t buf_used = PTR_DIFF(dest, base_ptr);
  32         if (dest_len == -1) {
  33                 if (((ptrdiff_t)dest < (ptrdiff_t)base_ptr) || (buf_used > (size_t)max_send)) {
  34 #if 0
  35                         DEBUG(0, ("Pushing string of 'unlimited' length into non-SMB buffer!\n"));
  36 #endif
  37                         return push_string_fn(function, line, base_ptr, dest, src, -1, flags);
  38                 }
  39                 return push_string_fn(function, line, base_ptr, dest, src, max_send - buf_used, flags);
  40         }
  41
  42         /* 'normal' push into size-specified buffer */
  43         return push_string_fn(function, line, base_ptr, dest, src, dest_len, flags);
  44 }