1 files changed, 59 insertions, 0 deletions
diff --git a/src/lib/version/version.c b/src/lib/version/version.c
new file mode 100644
index 0000000000..ec1d0bea2f
--- /dev/null
+++ b/src/lib/version/version.c
@@ -0,0 +1,59 @@
+/* Copyright 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 */
+
+#include "orconfig.h"
+#include "lib/version/torversion.h"
+#include "lib/version/git_revision.h"
+
+#include <stdio.h>
+#include <string.h>
+
+/**
+ * @file version.c
+ * @brief Functions to get the version of Tor.
+ **/
+
+/** A shorter version of this Tor process's version, for export in our router
+ *  descriptor.  (Does not include the git version, if any.) */
+static const char the_short_tor_version[] =
+  VERSION
+#ifdef TOR_BUILD_TAG
+  " ("TOR_BUILD_TAG")"
+#endif
+  "";
+
+/**
+ * Longest possible version length. We make this a constant so that we
+ * can statically allocate the_tor_version.
+ **/
+#define MAX_VERSION_LEN 128
+
+/** The version of this Tor process, possibly including git version */
+static char the_tor_version[MAX_VERSION_LEN] = "";
+
+/** Return the current Tor version. */
+const char *
+get_version(void)
+{
+  if (the_tor_version[0] == 0) {
+    if (strlen(tor_git_revision)) {
+      snprintf(the_tor_version, sizeof(the_tor_version),
+               "%s (git-%s)", the_short_tor_version, tor_git_revision);
+    } else {
+      snprintf(the_tor_version, sizeof(the_tor_version),
+               "%s", the_short_tor_version);
+    }
+    the_tor_version[sizeof(the_tor_version)-1] = 0;
+  }
+
+  return the_tor_version;
+}
+
+/** Return the current Tor version, without any git tag. */
+const char *
+get_short_version(void)
+{
+  return the_short_tor_version;
+}