D-Bus: Add ConfigFile parameter into the interface properties

This patch aims to expose the configuration file path as an interface
property, like is done with the driver and the bridge name. Doing so,
higher layer programs become responsible to recreate interfaces with the
correct configuration file path when programs need to remove them.

Signed-off-by: Jose Blanquicet <blanquicet@gmail.com>

doc/dbus.doxygen

@@ -680,6 +680,11 @@ fi.w1.wpa_supplicant1.CreateInterface.
 	<p>Name of driver used by the interface, e.g., nl80211.</p>
       </li>
 
+      <li>
+	<h3>ConfigFile - s - (read)</h3>
+	<p>Configuration file path. Returns an empty string if no configuration file is in use.</p>
+      </li>
+
       <li>
 	<h3>CurrentBSS - o - (read)</h3>
 	<p>Path to D-Bus object representing BSS which wpa_supplicant is associated with, or "/" if is not associated at all.</p>

wpa_supplicant/dbus/dbus_new.c

@@ -3158,6 +3158,11 @@ static const struct wpa_dbus_property_desc wpas_dbus_interface_properties[] = {
 	  NULL,
 	  NULL
 	},
+	{ "ConfigFile", WPAS_DBUS_NEW_IFACE_INTERFACE, "s",
+	  wpas_dbus_getter_config_file,
+	  NULL,
+	  NULL
+	},
 	{ "CurrentBSS", WPAS_DBUS_NEW_IFACE_INTERFACE, "o",
 	  wpas_dbus_getter_current_bss,
 	  NULL,

wpa_supplicant/dbus/dbus_new_handlers.c

@@ -3239,6 +3239,30 @@ dbus_bool_t wpas_dbus_getter_bridge_ifname(
 }
 
 
+/**
+ * wpas_dbus_getter_config_file - Get interface configuration file path
+ * @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 "ConfigFile" property.
+ */
+dbus_bool_t wpas_dbus_getter_config_file(
+	const struct wpa_dbus_property_desc *property_desc,
+	DBusMessageIter *iter, DBusError *error, void *user_data)
+{
+	struct wpa_supplicant *wpa_s = user_data;
+	char *confname = "";
+
+	if (wpa_s->confname)
+		confname = wpa_s->confname;
+
+	return wpas_dbus_simple_property_getter(iter, DBUS_TYPE_STRING,
+						&confname, error);
+}
+
+
 /**
  * wpas_dbus_getter_bsss - Get array of BSSs objects
  * @iter: Pointer to incoming dbus message iter

wpa_supplicant/dbus/dbus_new_handlers.h

@@ -150,6 +150,7 @@ DECLARE_ACCESSOR(wpas_dbus_setter_scan_interval);
 DECLARE_ACCESSOR(wpas_dbus_getter_ifname);
 DECLARE_ACCESSOR(wpas_dbus_getter_driver);
 DECLARE_ACCESSOR(wpas_dbus_getter_bridge_ifname);
+DECLARE_ACCESSOR(wpas_dbus_getter_config_file);
 DECLARE_ACCESSOR(wpas_dbus_getter_current_bss);
 DECLARE_ACCESSOR(wpas_dbus_getter_current_network);
 DECLARE_ACCESSOR(wpas_dbus_getter_current_auth_mode);