-#define log_dhcp_client(client, fmt, ...) log_meta(LOG_DEBUG, __FILE__, __LINE__, __func__, "DHCP CLIENT: " fmt, ##__VA_ARGS__)
+DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_unref);
+#define _cleanup_dhcp_client_unref_ _cleanup_(sd_dhcp_client_unrefp)
+
+/* If we are invoking callbacks of a dhcp-client, ensure unreffing the
+ * client from the callback doesn't destroy the object we are working
+ * on */
+#define DHCP_CLIENT_DONT_DESTROY(client) \
+ _cleanup_dhcp_client_unref_ _unused_ sd_dhcp_client *_dont_destroy_##client = sd_dhcp_client_ref(client)
+
+#define log_dhcp_client(client, fmt, ...) log_internal(LOG_DEBUG, 0, __FILE__, __LINE__, __func__, "DHCP CLIENT (0x%x): " fmt, client->xid, ##__VA_ARGS__)