openssl 1.1 tls version support

@@ -215,6 +215,19 @@
 #endif
 }
 
+/* convert internal version number to openssl version number */
+static int
+openssl_tls_version(int ver)
+{
+    if (ver == TLS_VER_1_0)
+        return TLS1_VERSION;
+    else if (ver == TLS_VER_1_1)
+        return TLS1_1_VERSION;
+    else if (ver == TLS_VER_1_2)
+        return TLS1_2_VERSION;
+    return 0;
+}
+
 void
 tls_ctx_set_options(struct tls_root_ctx *ctx, unsigned int ssl_flags)
 {

@@ -232,6 +245,17 @@
 
         tls_ver_max =
             (ssl_flags >> SSLF_TLS_VERSION_MAX_SHIFT) & SSLF_TLS_VERSION_MAX_MASK;
+
+#if OPENSSL_VERSION_NUMBER >= 0x10100000
+        if (tls_ver_min <= TLS_VER_UNSPEC)
+        {
+            SSL_CTX_set_min_proto_version(ctx->ctx, openssl_tls_version(tls_ver_min));
+        }
+        if (tls_ver_max <= TLS_VER_UNSPEC)
+        {
+            SSL_CTX_set_max_proto_version(ctx->ctx, openssl_tls_version(tls_ver_max));
+        }
+#else /* OPENSSL_VERSION_NUMBER >= 0x10100000*/
         if (tls_ver_max <= TLS_VER_UNSPEC)
         {
             tls_ver_max = tls_version_max();

@@ -253,6 +277,7 @@
             sslopt |= SSL_OP_NO_TLSv1_2;
         }
 #endif
+#endif /* OPENSSL_VERSION_NUMBER */
 #ifdef SSL_OP_NO_COMPRESSION
         /* Disable compression - flag not available in OpenSSL 0.9.8 */
         sslopt |= SSL_OP_NO_COMPRESSION;