Make function to convert version to string

Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

MR: #1595

ssl/ssl_lib.c

@@ -3060,26 +3060,31 @@ SSL_METHOD *ssl_bad_method(int ver)
     return (NULL);
 }
 
-const char *SSL_get_version(const SSL *s)
-{
-    if (s->version == TLS1_2_VERSION)
-        return ("TLSv1.2");
-    else if (s->version == TLS1_1_VERSION)
-        return ("TLSv1.1");
-    else if (s->version == TLS1_VERSION)
-        return ("TLSv1");
-    else if (s->version == SSL3_VERSION)
-        return ("SSLv3");
-    else if (s->version == DTLS1_BAD_VER)
-        return ("DTLSv0.9");
-    else if (s->version == DTLS1_VERSION)
-        return ("DTLSv1");
-    else if (s->version == DTLS1_2_VERSION)
-        return ("DTLSv1.2");
+const char *version_to_string(int version)
+{
+    if (version == TLS1_2_VERSION)
+        return "TLSv1.2";
+    else if (version == TLS1_1_VERSION)
+        return "TLSv1.1";
+    else if (version == TLS1_VERSION)
+        return "TLSv1.0";
+    else if (version == SSL3_VERSION)
+        return "SSLv3";
+    else if (version == DTLS1_BAD_VER)
+        return "DTLSv0.9";
+    else if (version == DTLS1_VERSION)
+        return "DTLSv1";
+    else if (version == DTLS1_2_VERSION)
+        return "DTLSv1.2";
     else
         return ("unknown");
 }
 
+const char *SSL_get_version(const SSL *s)
+{
+    return version_to_string(s->version);
+}
+
 SSL *SSL_dup(SSL *s)
 {
     STACK_OF(X509_NAME) *sk;

ssl/ssl_locl.h

@@ -1871,6 +1871,8 @@ struct openssl_ssl_test_functions {
 # endif
 };
 
+const char *version_to_string(int version);
+
 # ifndef OPENSSL_UNIT_TEST
 
 void ssl_clear_cipher_ctx(SSL *s);

ssl/ssl_txt.c

@@ -111,22 +111,7 @@ int SSL_SESSION_print(BIO *bp, const SSL_SESSION *x)
         goto err;
     if (BIO_puts(bp, "SSL-Session:\n") <= 0)
         goto err;
-    if (x->ssl_version == SSL3_VERSION)
-        s = "SSLv3";
-    else if (x->ssl_version == TLS1_2_VERSION)
-        s = "TLSv1.2";
-    else if (x->ssl_version == TLS1_1_VERSION)
-        s = "TLSv1.1";
-    else if (x->ssl_version == TLS1_VERSION)
-        s = "TLSv1";
-    else if (x->ssl_version == DTLS1_VERSION)
-        s = "DTLSv1";
-    else if (x->ssl_version == DTLS1_2_VERSION)
-        s = "DTLSv1.2";
-    else if (x->ssl_version == DTLS1_BAD_VER)
-        s = "DTLSv1-bad";
-    else
-        s = "unknown";
+    s = version_to_string(x->ssl_version);
     if (BIO_printf(bp, "    Protocol  : %s\n", s) <= 0)
         goto err;