Generate an event when a network is added or removed

Generate an event on the control socket interface when a network is
added or removed. The event name CTRL-EVENT-NETWORK-<ADDED|REMOVED>
is followed by the network entry identifier. The event matches the
corresponding Network<Added|Removed> signal on the d-bus interface.

Signed-off-by: Andrew Beltrano <anbeltra@microsoft.com>

src/common/wpa_ctrl.h

@@ -126,6 +126,10 @@ extern "C" {
 #define WPA_EVENT_FREQ_CONFLICT "CTRL-EVENT-FREQ-CONFLICT "
 /** Frequency ranges that the driver recommends to avoid */
 #define WPA_EVENT_AVOID_FREQ "CTRL-EVENT-AVOID-FREQ "
+/** A new network profile was added (followed by network entry id) */
+#define WPA_EVENT_NETWORK_ADDED "CTRL-EVENT-NETWORK-ADDED "
+/** A network profile was removed (followed by prior network entry id) */
+#define WPA_EVENT_NETWORK_REMOVED "CTRL-EVENT-NETWORK-REMOVED "
 /** Result of MSCS setup */
 #define WPA_EVENT_MSCS_RESULT "CTRL-EVENT-MSCS-RESULT "
 /** WPS overlap detected in PBC mode */

wpa_supplicant/notify.c

@@ -350,8 +350,11 @@ void wpas_notify_network_added(struct wpa_supplicant *wpa_s,
 	 * applications since these network objects won't behave like
 	 * regular ones.
 	 */
-	if (!ssid->p2p_group && wpa_s->global->p2p_group_formation != wpa_s)
+	if (!ssid->p2p_group && wpa_s->global->p2p_group_formation != wpa_s) {
 		wpas_dbus_register_network(wpa_s, ssid);
+		wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_NETWORK_ADDED "%d",
+			     ssid->id);
+	}
 }
 
 
@@ -381,8 +384,11 @@ void wpas_notify_network_removed(struct wpa_supplicant *wpa_s,
 	if (wpa_s->wpa)
 		wpa_sm_pmksa_cache_flush(wpa_s->wpa, ssid);
 	if (!ssid->p2p_group && wpa_s->global->p2p_group_formation != wpa_s &&
-	    !wpa_s->p2p_mgmt)
+	    !wpa_s->p2p_mgmt) {
 		wpas_dbus_unregister_network(wpa_s, ssid->id);
+		wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_NETWORK_REMOVED "%d",
+			     ssid->id);
+	}
 	if (network_is_persistent_group(ssid))
 		wpas_notify_persistent_group_removed(wpa_s, ssid);