lib/secure_getenv.c

   1 /* Look up an environment variable more securely.
   2
   3    Copyright 2013-2016 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 #include <stdlib.h>
  21
  22 #if !HAVE___SECURE_GETENV
  23 # if HAVE_ISSETUGID
  24 #  include <unistd.h>
  25 # else
  26 #  undef issetugid
  27 #  define issetugid() 1
  28 # endif
  29 #endif
  30
  31 char *
  32 secure_getenv (char const *name)
  33 {
  34 #if HAVE___SECURE_GETENV
  35   return __secure_getenv (name);
  36 #else
  37   if (issetugid ())
  38     return 0;
  39   return getenv (name);
  40 #endif
  41 }