D-Bus: Fix .Group Set(WPSVendorExtensions) format

The earlier implementation seemed to require a strange extra
encapsulation with a dictionary for setting the WPSVendorExtensions
property while this was defined to have aay signature and the get
operation did indeed return and array of array of bytes without that
dictionary. Fix this to accept aay format for the setter as well. Keep
support for the old dictionary encapsulation format for backwards
compatibility.

Signed-off-by: Jouni Malinen <j@w1.fi>

wpa_supplicant/dbus/dbus_new_handlers_p2p.c

@@ -2194,7 +2194,7 @@ dbus_bool_t wpas_dbus_setter_p2p_group_vendor_ext(DBusMessageIter *iter,
 						  void *user_data)
 {
 	struct wpa_supplicant *wpa_s = user_data;
-	DBusMessageIter variant_iter, iter_dict;
+	DBusMessageIter variant_iter, iter_dict, array_iter, sub;
 	struct wpa_dbus_dict_entry entry = { .type = DBUS_TYPE_STRING };
 	unsigned int i;
 	struct hostapd_data *hapd = NULL;
@@ -2206,6 +2206,82 @@ dbus_bool_t wpas_dbus_setter_p2p_group_vendor_ext(DBusMessageIter *iter,
 		return FALSE;
 
 	dbus_message_iter_recurse(iter, &variant_iter);
+	if (dbus_message_iter_get_arg_type(&variant_iter) != DBUS_TYPE_ARRAY)
+		return FALSE;
+
+	/*
+	 * This is supposed to be array of bytearrays (aay), but the earlier
+	 * implementation used a dict with "WPSVendorExtensions" as the key in
+	 * this setter function which does not match the format used by the
+	 * getter function. For backwards compatibility, allow both formats to
+	 * be used in the setter.
+	 */
+	if (dbus_message_iter_get_element_type(&variant_iter) ==
+	    DBUS_TYPE_ARRAY) {
+		/* This is the proper format matching the getter */
+		struct wpabuf *vals[MAX_WPS_VENDOR_EXTENSIONS];
+
+		dbus_message_iter_recurse(&variant_iter, &array_iter);
+
+		if (dbus_message_iter_get_arg_type(&array_iter) !=
+		    DBUS_TYPE_ARRAY ||
+		    dbus_message_iter_get_element_type(&array_iter) !=
+		    DBUS_TYPE_BYTE) {
+			wpa_printf(MSG_DEBUG,
+				   "dbus: Not an array of array of bytes");
+			return FALSE;
+		}
+
+		i = 0;
+		os_memset(vals, 0, sizeof(vals));
+
+		while (dbus_message_iter_get_arg_type(&array_iter) ==
+		       DBUS_TYPE_ARRAY) {
+			char *val;
+			int len;
+
+			if (i == MAX_WPS_VENDOR_EXTENSIONS) {
+				wpa_printf(MSG_DEBUG,
+					   "dbus: Too many WPSVendorExtensions values");
+				i = MAX_WPS_VENDOR_EXTENSIONS + 1;
+				break;
+			}
+
+			dbus_message_iter_recurse(&array_iter, &sub);
+			dbus_message_iter_get_fixed_array(&sub, &val, &len);
+			wpa_hexdump(MSG_DEBUG, "dbus: WPSVendorExtentions[]",
+				    val, len);
+			vals[i] = wpabuf_alloc_copy(val, len);
+			if (vals[i] == NULL) {
+				i = MAX_WPS_VENDOR_EXTENSIONS + 1;
+				break;
+			}
+			i++;
+			dbus_message_iter_next(&array_iter);
+		}
+
+		if (i > MAX_WPS_VENDOR_EXTENSIONS) {
+			for (i = 0; i < MAX_WPS_VENDOR_EXTENSIONS; i++)
+				wpabuf_free(vals[i]);
+			return FALSE;
+		}
+
+		for (i = 0; i < MAX_WPS_VENDOR_EXTENSIONS; i++) {
+			wpabuf_free(hapd->conf->wps_vendor_ext[i]);
+			hapd->conf->wps_vendor_ext[i] = vals[i];
+		}
+
+		hostapd_update_wps(hapd);
+
+		return TRUE;
+	}
+
+	if (dbus_message_iter_get_element_type(&variant_iter) !=
+	    DBUS_TYPE_DICT_ENTRY)
+		return FALSE;
+
+	wpa_printf(MSG_DEBUG,
+		   "dbus: Try to use backwards compatibility version of WPSVendorExtensions setter");
 	if (!wpa_dbus_dict_open_read(&variant_iter, &iter_dict, error))
 		return FALSE;