src/common/compat/getenv.h

   1 #ifndef _COMPAT_GETENV_H
   2 #define _COMPAT_GETENV_H
   3
   4 /*
   5  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * SPDX-License-Identifier: LGPL-2.1-only
   8  *
   9  */
  10
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <common/error.h>
  15
  16 static inline
  17 int lttng_is_setuid_setgid(void)
  18 {
  19         return geteuid() != getuid() || getegid() != getgid();
  20 }
  21
  22 static inline
  23 char *lttng_secure_getenv(const char *name)
  24 {
  25         if (lttng_is_setuid_setgid()) {
  26                 WARN("Getting environment variable '%s' from setuid/setgid binary refused for security reasons.",
  27                         name);
  28                 return NULL;
  29         }
  30         return getenv(name);
  31 }
  32
  33 #endif /* _COMPAT_GETENV_H */