+static const char *
+ssl_handshake_type_to_string(uint8_t type)
+{
+ switch (type) {
+ case 0: return "hello_request";
+ case 1: return "client_hello";
+ case 2: return "server_hello";
+ case 11: return "certificate";
+ case 12: return "server_key_exchange";
+ case 13: return "certificate_request";
+ case 14: return "server_hello_done";
+ case 15: return "certificate_verify";
+ case 16: return "client_key_exchange";
+ case 20: return "finished";
+ default: return "<unknown>";
+ }
+}
+
+static void
+ssl_protocol_cb(int write_p, int version OVS_UNUSED, int content_type,
+ const void *buf_, size_t len, SSL *ssl OVS_UNUSED, void *sslv_)
+{
+ const struct ssl_stream *sslv = sslv_;
+ const uint8_t *buf = buf_;
+ struct ds details;
+
+ if (!VLOG_IS_DBG_ENABLED()) {
+ return;
+ }
+
+ ds_init(&details);
+ if (content_type == 20) {
+ ds_put_cstr(&details, "change_cipher_spec");
+ } else if (content_type == 21) {
+ ds_put_format(&details, "alert: %s, %s",
+ ssl_alert_level_to_string(buf[0]),
+ ssl_alert_description_to_string(buf[1]));
+ } else if (content_type == 22) {
+ ds_put_format(&details, "handshake: %s",
+ ssl_handshake_type_to_string(buf[0]));
+ } else {
+ ds_put_format(&details, "type %d", content_type);
+ }
+
+ VLOG_DBG("%s%u%s%s %s (%zu bytes)",
+ sslv->type == CLIENT ? "client" : "server",
+ sslv->session_nr, write_p ? "-->" : "<--",
+ stream_get_name(&sslv->stream), ds_cstr(&details), len);