dbus: Add global capabilities property

Otherwise it's difficult to determine if the supplicant was built with
CONFIG_AP, CONFIG_IBSS_RSN, CONFIG_P2P, etc. CONFIG_AP and CONFIG_P2P
can be inferred from the introspection data of the Interface object,
but CONFIG_IBSS_RSN does not change the introspection data at all and
thus it's impossible to determine whether the supplicant supports it
without knowing its compile-time options.

Signed-hostap: Dan Williams <dcbw@redhat.com>
intended-for: hostap-1

wpa_supplicant/dbus/dbus_new.c

@@ -1950,6 +1950,10 @@ static const struct wpa_dbus_property_desc wpas_dbus_global_properties[] = {
 	  wpas_dbus_getter_eap_methods,
 	  NULL
 	},
+	{ "Capabilities", WPAS_DBUS_NEW_INTERFACE, "as",
+	  wpas_dbus_getter_global_capabilities,
+	  NULL
+	},
 	{ NULL, NULL, NULL, NULL, NULL }
 };
 

wpa_supplicant/dbus/dbus_new_handlers.c

@@ -924,6 +924,44 @@ dbus_bool_t wpas_dbus_getter_eap_methods(DBusMessageIter *iter,
 }
 
 
+/**
+ * wpas_dbus_getter_global_capabilities - Request supported global capabilities
+ * @iter: Pointer to incoming dbus message iter
+ * @error: Location to store error on failure
+ * @user_data: Function specific data
+ * Returns: TRUE on success, FALSE on failure
+ *
+ * Getter for "Capabilities" property. Handles requests by dbus clients to
+ * return a list of strings with supported capabilities like AP, RSN IBSS,
+ * and P2P that are determined at compile time.
+ */
+dbus_bool_t wpas_dbus_getter_global_capabilities(DBusMessageIter *iter,
+					         DBusError *error,
+					         void *user_data)
+{
+	const char *capabilities[5] = { NULL, NULL, NULL, NULL, NULL };
+	size_t num_items = 0;
+
+#ifdef CONFIG_AP
+	capabilities[num_items++] = "ap";
+#endif /* CONFIG_AP */
+#ifdef CONFIG_IBSS_RSN
+	capabilities[num_items++] = "ibss-rsn";
+#endif /* CONFIG_IBSS_RSN */
+#ifdef CONFIG_P2P
+	capabilities[num_items++] = "p2p";
+#endif /* CONFIG_P2P */
+#ifdef CONFIG_INTERWORKING
+	capabilities[num_items++] = "interworking";
+#endif /* CONFIG_INTERWORKING */
+
+	return wpas_dbus_simple_array_property_getter(iter,
+						      DBUS_TYPE_STRING,
+						      capabilities,
+						      num_items, error);
+}
+
+
 static int wpas_dbus_get_scan_type(DBusMessage *message, DBusMessageIter *var,
 				   char **type, DBusMessage **reply)
 {

wpa_supplicant/dbus/dbus_new_handlers.h

@@ -80,6 +80,10 @@ dbus_bool_t wpas_dbus_getter_interfaces(DBusMessageIter *iter,
 dbus_bool_t wpas_dbus_getter_eap_methods(DBusMessageIter *iter,
 					 DBusError *error, void *user_data);
 
+dbus_bool_t wpas_dbus_getter_global_capabilities(DBusMessageIter *iter,
+						 DBusError *error,
+						 void *user_data);
+
 DBusMessage * wpas_dbus_handler_scan(DBusMessage *message,
 				     struct wpa_supplicant *wpa_s);