Add running glibc version to the log. #40047

Also adds the compiled and running glibc version when using the
--library-versions flag.

3 files changed, 89 insertions, 2 deletions

diff --git a/src/lib/osinfo/include.am b/src/lib/osinfo/include.am
index 84bd7feb00..df8c98500c 100644
--- a/src/lib/osinfo/include.am
+++ b/src/lib/osinfo/include.am
@@ -7,7 +7,8 @@ endif
 
 # ADD_C_FILE: INSERT SOURCES HERE.
 src_lib_libtor_osinfo_a_SOURCES =			\
-	src/lib/osinfo/uname.c
+	src/lib/osinfo/uname.c		\
+	src/lib/osinfo/libc.c
 
 src_lib_libtor_osinfo_testing_a_SOURCES = \
 	$(src_lib_libtor_osinfo_a_SOURCES)
@@ -16,4 +17,5 @@ src_lib_libtor_osinfo_testing_a_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
 
 # ADD_C_FILE: INSERT HEADERS HERE.
 noinst_HEADERS +=					\
-	src/lib/osinfo/uname.h
+	src/lib/osinfo/uname.h		\
+	src/lib/osinfo/libc.h
diff --git a/src/lib/osinfo/libc.c b/src/lib/osinfo/libc.c
new file mode 100644
index 0000000000..32cbad0fa2
--- /dev/null
+++ b/src/lib/osinfo/libc.c
@@ -0,0 +1,66 @@
+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2020, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * @file libc.c
+ * @brief Functions to get the name and version of the system libc.
+ **/
+
+#include "orconfig.h"
+#include "lib/osinfo/libc.h"
+#include <stdlib.h>
+
+#ifdef HAVE_GNU_LIBC_VERSION_H
+#include <gnu/libc-version.h>
+#endif
+
+#ifdef HAVE_GNU_LIBC_VERSION_H
+#ifdef HAVE_GNU_GET_LIBC_VERSION
+#define CHECK_LIBC_VERSION
+#endif
+#endif
+
+#define STR_IMPL(x) #x
+#define STR(x) STR_IMPL(x)
+
+/** Return the name of the compile time libc. Returns NULL if we
+ * cannot identify the libc. */
+const char *
+tor_libc_get_name(void)
+{
+#ifdef __GLIBC__
+  return "Glibc";
+#else /* !defined(__GLIBC__) */
+  return NULL;
+#endif /* defined(__GLIBC__) */
+}
+
+/** Return a string representation of the version of the currently running
+ * version of Glibc. */
+const char *
+tor_libc_get_version_str(void)
+{
+#ifdef CHECK_LIBC_VERSION
+  const char *version = gnu_get_libc_version();
+  if (version == NULL)
+    return "N/A";
+  return version;
+#else /* !defined(CHECK_LIBC_VERSION) */
+  return "N/A";
+#endif /* defined(CHECK_LIBC_VERSION) */
+}
+
+/** Return a string representation of the version of Glibc that was used at
+ * compilation time. */
+const char *
+tor_libc_get_header_version_str(void)
+{
+#ifdef __GLIBC__
+  return STR(__GLIBC__) "." STR(__GLIBC_MINOR__);
+#else
+  return "N/A";
+#endif /* defined(__GLIBC__) */
+}
diff --git a/src/lib/osinfo/libc.h b/src/lib/osinfo/libc.h
new file mode 100644
index 0000000000..f4303f8c9c
--- /dev/null
+++ b/src/lib/osinfo/libc.h
@@ -0,0 +1,19 @@
+/* Copyright (c) 2001 Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2020, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * @file libc.h
+ * @brief Header for lib/osinfo/libc.c
+ **/
+
+#ifndef TOR_LIB_OSINFO_LIBC_H
+#define TOR_LIB_OSINFO_LIBC_H
+
+const char *tor_libc_get_name(void);
+const char *tor_libc_get_version_str(void);
+const char *tor_libc_get_header_version_str(void);
+
+#endif /* !defined(TOR_LIB_OSINFO_LIBC_H) */