WPS: Added control interface notification for available WPS APs

Whenever new scan results include WPS AP(s) and the client is not
associated, send a notification message to control interface monitors.
This makes it easier for GUIs to notify the user about possible WPS
availability without having to go through the scan results.

src/common/wpa_ctrl.h

@@ -49,7 +49,15 @@ extern "C" {
 /** New scan results available */
 #define WPA_EVENT_SCAN_RESULTS "CTRL-EVENT-SCAN-RESULTS "
 
+/** WPS overlap detected in PBC mode */
 #define WPS_EVENT_OVERLAP "WPS-OVERLAP-DETECTED "
+/** Available WPS AP with active PBC found in scan results */
+#define WPS_EVENT_AP_AVAILABLE_PBC "WPS-AP-AVAILABLE-PBC "
+/** Available WPS AP with recently selected PIN registrar found in scan results
+ */
+#define WPS_EVENT_AP_AVAILABLE_PIN "WPS-AP-AVAILABLE-PIN "
+/** Available WPS AP found in scan results */
+#define WPS_EVENT_AP_AVAILABLE "WPS-AP-AVAILABLE "
 
 /* hostapd control interface - fixed message prefixes */
 #define WPS_EVENT_PIN_NEEDED "WPS-PIN-NEEDED "

wpa_supplicant/events.c

@@ -626,6 +626,7 @@ static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s)
 	} else {
 		wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
 		wpa_supplicant_dbus_notify_scan_results(wpa_s);
+		wpas_wps_notify_scan_results(wpa_s);
 	}
 
 	if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)

wpa_supplicant/wps_supplicant.c

@@ -21,6 +21,7 @@
 #include "eap_peer/eap.h"
 #include "wpa_supplicant_i.h"
 #include "eloop.h"
+#include "wpa_ctrl.h"
 #include "eap_common/eap_wsc_common.h"
 #include "wps/wps.h"
 #include "wps/wps_defs.h"
@@ -558,3 +559,28 @@ int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
 
 	return ret;
 }
+
+
+void wpas_wps_notify_scan_results(struct wpa_supplicant *wpa_s)
+{
+	size_t i;
+
+	if (wpa_s->disconnected || wpa_s->wpa_state >= WPA_ASSOCIATED)
+		return;
+
+	for (i = 0; i < wpa_s->scan_res->num; i++) {
+		struct wpa_scan_res *bss = wpa_s->scan_res->res[i];
+		struct wpabuf *ie;
+		ie = wpa_scan_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
+		if (!ie)
+			continue;
+		if (wps_is_selected_pbc_registrar(ie))
+			wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE_PBC);
+		else if (wps_is_selected_pin_registrar(ie))
+			wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE_PIN);
+		else
+			wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_AP_AVAILABLE);
+		wpabuf_free(ie);
+		break;
+	}
+}

wpa_supplicant/wps_supplicant.h

@@ -31,6 +31,7 @@ int wpas_wps_ssid_wildcard_ok(struct wpa_ssid *ssid, struct wpa_scan_res *bss);
 int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
 			      struct wpa_scan_res *selected,
 			      struct wpa_ssid *ssid);
+void wpas_wps_notify_scan_results(struct wpa_supplicant *wpa_s);
 
 #else /* CONFIG_WPS */
 
@@ -72,6 +73,10 @@ static inline int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
 	return 0;
 }
 
+static inline void wpas_wps_notify_scan_results(struct wpa_supplicant *wpa_s)
+{
+}
+
 #endif /* CONFIG_WPS */
 
 #endif /* WPS_SUPPLICANT_H */