fetcher: Add option to retrieve response code from a fetcher

src/libstrongswan/fetcher/fetcher.h

@@ -81,6 +81,12 @@ enum fetcher_option_t {
 	 */
 	FETCH_TIMEOUT,
 
+	/**
+	 * Sets a pointer to a variable that receives the request's response code.
+	 * Additional argument is a u_int*.
+	 */
+	FETCH_RESPONSE_CODE,
+
 	/**
 	 * Callback to invoke with each chunk of data.
 	 * Additional argument fetch_callback_t.

src/libstrongswan/fetcher/fetcher_manager.c

@@ -113,6 +113,10 @@ METHOD(fetcher_manager_t, fetch, status_t,
 					good = fetcher->set_option(fetcher, opt,
 											va_arg(args, fetcher_callback_t));
 					continue;
+				case FETCH_RESPONSE_CODE:
+					good = fetcher->set_option(fetcher, opt,
+											va_arg(args, u_int*));
+					continue;
 				case FETCH_SOURCEIP:
 					host = va_arg(args, host_t*);
 					if (host && !host->is_anyaddr(host))