[PATCH] dbus: add BSS Age property to indicate last-seen time

Dan Williams dcbw at redhat.com
Thu Sep 4 14:10:54 EDT 2014


"Age" is the age in seconds since the BSS was last seen, and is
emitted as a PropertyChanged signal whenever the BSS is updated
from a scan result.  It also returns the correct age when queried
directly.

This property can be used to resolve issues where, if no other
properties of the BSS changed from scan results (for example,
if the BSS always had 100% signal) no D-Bus signals would be
emitted to indicate that the BSS had just been seen in the scan.

Signed-hostap: Dan Williams <dcbw at redhat.com>
---
 wpa_supplicant/bss.c                    |  2 ++
 wpa_supplicant/dbus/dbus_new.c          |  7 +++++++
 wpa_supplicant/dbus/dbus_new.h          |  1 +
 wpa_supplicant/dbus/dbus_new_handlers.c | 28 ++++++++++++++++++++++++++++
 wpa_supplicant/dbus/dbus_new_handlers.h |  3 +++
 wpa_supplicant/notify.c                 |  6 ++++++
 wpa_supplicant/notify.h                 |  1 +
 7 files changed, 48 insertions(+)

diff --git a/wpa_supplicant/bss.c b/wpa_supplicant/bss.c
index f99a8a7..7d01a5f 100644
--- a/wpa_supplicant/bss.c
+++ b/wpa_supplicant/bss.c
@@ -485,14 +485,16 @@ static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
 		wpas_notify_bss_wps_changed(wpa_s, bss->id);
 
 	if (changes & WPA_BSS_IES_CHANGED_FLAG)
 		wpas_notify_bss_ies_changed(wpa_s, bss->id);
 
 	if (changes & WPA_BSS_RATES_CHANGED_FLAG)
 		wpas_notify_bss_rates_changed(wpa_s, bss->id);
+
+	wpas_notify_bss_seen(wpa_s, bss->id);
 }
 
 
 static struct wpa_bss *
 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
 	       struct wpa_scan_res *res, struct os_reltime *fetch_time)
 {
diff --git a/wpa_supplicant/dbus/dbus_new.c b/wpa_supplicant/dbus/dbus_new.c
index 5aa8d73..73b1aea 100644
--- a/wpa_supplicant/dbus/dbus_new.c
+++ b/wpa_supplicant/dbus/dbus_new.c
@@ -1956,14 +1956,17 @@ void wpas_dbus_bss_signal_prop_changed(struct wpa_supplicant *wpa_s,
 		break;
 	case WPAS_DBUS_BSS_PROP_WPS:
 		prop = "WPS";
 		break;
 	case WPAS_DBUS_BSS_PROP_IES:
 		prop = "IEs";
 		break;
+	case WPAS_DBUS_BSS_PROP_AGE:
+		prop = "Age";
+		break;
 	default:
 		wpa_printf(MSG_ERROR, "dbus: %s: Unknown Property value %d",
 			   __func__, property);
 		return;
 	}
 
 	os_snprintf(path, WPAS_DBUS_OBJECT_PATH_MAX,
@@ -2380,14 +2383,18 @@ static const struct wpa_dbus_property_desc wpas_dbus_bss_properties[] = {
 	  wpas_dbus_getter_bss_wps,
 	  NULL
 	},
 	{ "IEs", WPAS_DBUS_NEW_IFACE_BSS, "ay",
 	  wpas_dbus_getter_bss_ies,
 	  NULL
 	},
+	{ "Age", WPAS_DBUS_NEW_IFACE_BSS, "u",
+	  wpas_dbus_getter_bss_age,
+	  NULL
+	},
 	{ NULL, NULL, NULL, NULL, NULL }
 };
 
 
 static const struct wpa_dbus_signal_desc wpas_dbus_bss_signals[] = {
 	/* Deprecated: use org.freedesktop.DBus.Properties.PropertiesChanged */
 	{ "PropertiesChanged", WPAS_DBUS_NEW_IFACE_BSS,
diff --git a/wpa_supplicant/dbus/dbus_new.h b/wpa_supplicant/dbus/dbus_new.h
index 881d351..5f32bbf 100644
--- a/wpa_supplicant/dbus/dbus_new.h
+++ b/wpa_supplicant/dbus/dbus_new.h
@@ -37,14 +37,15 @@ enum wpas_dbus_bss_prop {
 	WPAS_DBUS_BSS_PROP_MODE,
 	WPAS_DBUS_BSS_PROP_PRIVACY,
 	WPAS_DBUS_BSS_PROP_RATES,
 	WPAS_DBUS_BSS_PROP_WPA,
 	WPAS_DBUS_BSS_PROP_RSN,
 	WPAS_DBUS_BSS_PROP_WPS,
 	WPAS_DBUS_BSS_PROP_IES,
+	WPAS_DBUS_BSS_PROP_AGE,
 };
 
 #define WPAS_DBUS_OBJECT_PATH_MAX 150
 
 #define WPAS_DBUS_NEW_SERVICE		"fi.w1.wpa_supplicant1"
 #define WPAS_DBUS_NEW_PATH		"/fi/w1/wpa_supplicant1"
 #define WPAS_DBUS_NEW_INTERFACE		"fi.w1.wpa_supplicant1"
diff --git a/wpa_supplicant/dbus/dbus_new_handlers.c b/wpa_supplicant/dbus/dbus_new_handlers.c
index 599ab50..b973259 100644
--- a/wpa_supplicant/dbus/dbus_new_handlers.c
+++ b/wpa_supplicant/dbus/dbus_new_handlers.c
@@ -4030,14 +4030,42 @@ dbus_bool_t wpas_dbus_getter_bss_ies(DBusMessageIter *iter, DBusError *error,
 		return FALSE;
 
 	return wpas_dbus_simple_array_property_getter(iter, DBUS_TYPE_BYTE,
 						      res + 1, res->ie_len,
 						      error);
 }
 
+/**
+ * wpas_dbus_getter_bss_age - Return time in seconds since BSS was last seen
+ * @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 BSS age
+ */
+dbus_bool_t wpas_dbus_getter_bss_age(DBusMessageIter *iter, DBusError *error,
+				     void *user_data)
+{
+	struct bss_handler_args *args = user_data;
+	struct wpa_bss *res;
+	struct os_reltime now, diff = { 0, 0 };
+	u32 age;
+
+	res = get_bss_helper(args, error, __func__);
+	if (!res)
+		return FALSE;
+
+	os_get_reltime(&now);
+	os_reltime_sub(&now, &res->last_update, &diff);
+	age = diff.sec > 0 ? diff.sec : 0;
+	return wpas_dbus_simple_property_getter(iter, DBUS_TYPE_UINT32, &age,
+						error);
+}
+
 
 /**
  * wpas_dbus_getter_enabled - Check whether network is enabled or disabled
  * @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
diff --git a/wpa_supplicant/dbus/dbus_new_handlers.h b/wpa_supplicant/dbus/dbus_new_handlers.h
index f00eb88..51cf5f3 100644
--- a/wpa_supplicant/dbus/dbus_new_handlers.h
+++ b/wpa_supplicant/dbus/dbus_new_handlers.h
@@ -267,14 +267,17 @@ dbus_bool_t wpas_dbus_getter_bss_rsn(DBusMessageIter *iter, DBusError *error,
 
 dbus_bool_t wpas_dbus_getter_bss_wps(DBusMessageIter *iter, DBusError *error,
 				     void *user_data);
 
 dbus_bool_t wpas_dbus_getter_bss_ies(DBusMessageIter *iter, DBusError *error,
 				     void *user_data);
 
+dbus_bool_t wpas_dbus_getter_bss_age(DBusMessageIter *iter, DBusError *error,
+				     void *user_data);
+
 dbus_bool_t wpas_dbus_getter_enabled(DBusMessageIter *iter, DBusError *error,
 				     void *user_data);
 
 dbus_bool_t wpas_dbus_setter_enabled(DBusMessageIter *iter, DBusError *error,
 				     void *user_data);
 
 dbus_bool_t wpas_dbus_getter_network_properties(DBusMessageIter *iter,
diff --git a/wpa_supplicant/notify.c b/wpa_supplicant/notify.c
index 3b730cf..b29fdac 100644
--- a/wpa_supplicant/notify.c
+++ b/wpa_supplicant/notify.c
@@ -341,14 +341,20 @@ void wpas_notify_bss_ies_changed(struct wpa_supplicant *wpa_s,
 void wpas_notify_bss_rates_changed(struct wpa_supplicant *wpa_s,
 				   unsigned int id)
 {
 	wpas_dbus_bss_signal_prop_changed(wpa_s, WPAS_DBUS_BSS_PROP_RATES, id);
 }
 
 
+void wpas_notify_bss_seen(struct wpa_supplicant *wpa_s, unsigned int id)
+{
+	wpas_dbus_bss_signal_prop_changed(wpa_s, WPAS_DBUS_BSS_PROP_AGE, id);
+}
+
+
 void wpas_notify_blob_added(struct wpa_supplicant *wpa_s, const char *name)
 {
 	wpas_dbus_signal_blob_added(wpa_s, name);
 }
 
 
 void wpas_notify_blob_removed(struct wpa_supplicant *wpa_s, const char *name)
diff --git a/wpa_supplicant/notify.h b/wpa_supplicant/notify.h
index 58675ac..5dda608 100644
--- a/wpa_supplicant/notify.h
+++ b/wpa_supplicant/notify.h
@@ -67,14 +67,15 @@ void wpas_notify_bss_rsnie_changed(struct wpa_supplicant *wpa_s,
 				   unsigned int id);
 void wpas_notify_bss_wps_changed(struct wpa_supplicant *wpa_s,
 				 unsigned int id);
 void wpas_notify_bss_ies_changed(struct wpa_supplicant *wpa_s,
 				 unsigned int id);
 void wpas_notify_bss_rates_changed(struct wpa_supplicant *wpa_s,
 				   unsigned int id);
+void wpas_notify_bss_seen(struct wpa_supplicant *wpa_s, unsigned int id);
 void wpas_notify_blob_added(struct wpa_supplicant *wpa_s, const char *name);
 void wpas_notify_blob_removed(struct wpa_supplicant *wpa_s, const char *name);
 
 void wpas_notify_debug_level_changed(struct wpa_global *global);
 void wpas_notify_debug_timestamp_changed(struct wpa_global *global);
 void wpas_notify_debug_show_keys_changed(struct wpa_global *global);
 void wpas_notify_suspend(struct wpa_global *global);
-- 
1.9.3




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