Fix: add missing getenv wrapper

[lttng-ust.git] / liblttng-ust / getenv.h

diff --git a/liblttng-ust/getenv.h b/liblttng-ust/getenv.h
new file mode 100644 (file)
index 0000000..05864fb
--- /dev/null
+++ b/liblttng-ust/getenv.h
@@ -0,0 +1,44 @@
+#ifndef _COMPAT_GETENV_H
+#define _COMPAT_GETENV_H
+
+/*
+ * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <usterr-signal-safe.h>
+
+static inline
+int lttng_is_setuid_setgid(void)
+{
+       return geteuid() != getuid() || getegid() != getgid();
+}
+
+static inline
+char *lttng_secure_getenv(const char *name)
+{
+       if (lttng_is_setuid_setgid()) {
+               ERR("Getting environment variable '%s' from setuid/setgid binary refused for security reasons.",
+                       name);
+               return NULL;
+       }
+       return getenv(name);
+}
+
+#endif /* _COMPAT_GETENV_H */