perflib: add perflib_print_version()

A helper function that prints version information, so far the version
of the OpenSSL library a program is run with.

Signed-off-by: Eugene Syromiatnikov <[email protected]>

Author: esyr

source/perflib/perfhelper.c

@@ -7,6 +7,7 @@
  * https://www.openssl.org/source/license.html
  */
 
+#include <stdio.h>
 #include <string.h>
 #include <openssl/crypto.h>
 #include <openssl/bio.h>
@@ -31,3 +32,13 @@ char *perflib_mk_file_path(const char *dir, const char *file)
 
     return full_file;
 }
+
+void perflib_print_version(const char * const progname)
+{
+    fprintf(stderr,
+            "%s version information:\n"
+            "  OpenSSL library: %s (%s)\n",
+            progname,
+            OpenSSL_version(OPENSSL_VERSION),
+            OpenSSL_version(OPENSSL_BUILT_ON));
+}

source/perflib/perflib.h

@@ -61,3 +61,11 @@ int perflib_create_ssl_connection(SSL *serverssl, SSL *clientssl, int want);
 void perflib_shutdown_ssl_connection(SSL *serverssl, SSL *clientssl);
 
 #endif
+
+/**
+ * Print relevant version information.  So far only prints OpenSSL library
+ * version and build date.
+ *
+ * @param progname The name of the program.
+ */
+void perflib_print_version(const char *progname);