wpa_supplicant: Add 'SCAN TYPE=ONLY' functionality

Usual manual scan request may cause reassociation due to several reasons.
New command is intended to perform pure scan.

Change-Id: I5f517a9f50f286482290e76ca1088abf6a1aeff9
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

diff --git a/wpa_supplicant/ctrl_iface.c b/wpa_supplicant/ctrl_iface.c
index 3408a85..8c186bd 100644 (file)
--- a/wpa_supplicant/ctrl_iface.c
+++ b/wpa_supplicant/ctrl_iface.c
@@ -5161,10 +5161,14 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
                wpa_supplicant_cancel_scan(wpa_s);
                wpa_supplicant_deauthenticate(wpa_s,
                                              WLAN_REASON_DEAUTH_LEAVING);
-       } else if (os_strcmp(buf, "SCAN") == 0) {
+       } else if ((os_strcmp(buf, "SCAN") == 0) ||
+                  (os_strncmp(buf, "SCAN ", 5) == 0)) {
                if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED)
                        reply_len = -1;
                else {
+                       if ((os_strlen(buf) > 4) &&
+                           (os_strncasecmp(buf + 5, "TYPE=ONLY", 9) == 0))
+                               wpa_s->scan_res_handler = scan_only_handler;
                        if (!wpa_s->sched_scanning && !wpa_s->scanning &&
                            ((wpa_s->wpa_state <= WPA_SCANNING) ||
                             (wpa_s->wpa_state == WPA_COMPLETED))) {

diff --git a/wpa_supplicant/events.c b/wpa_supplicant/events.c
index 3fefb48..2b62e6b 100644 (file)
--- a/wpa_supplicant/events.c
+++ b/wpa_supplicant/events.c
@@ -1109,7 +1109,8 @@ static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
                                                   data ? &data->scan_info :
                                                   NULL, 1);
        if (scan_res == NULL) {
-               if (wpa_s->conf->ap_scan == 2 || ap)
+               if ((wpa_s->conf->ap_scan == 2 || ap) ||
+                   (wpa_s->scan_res_handler == scan_only_handler))
                        return -1;
                wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results - try "
                        "scanning again");

diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
index c59b8ba..4b2b9fd 100644 (file)
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -11,6 +11,7 @@
 #include "utils/common.h"
 #include "utils/eloop.h"
 #include "common/ieee802_11_defs.h"
+#include "common/wpa_ctrl.h"
 #include "config.h"
 #include "wpa_supplicant_i.h"
 #include "driver_i.h"
@@ -1583,3 +1584,14 @@ int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
 
        return 0;
 }
+
+
+/**
+ * scan_only_handler - Reports scan results
+ */
+void scan_only_handler(struct wpa_supplicant *wpa_s,
+                      struct wpa_scan_results *scan_res)
+{
+       wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
+       wpas_notify_scan_results(wpa_s);
+}

diff --git a/wpa_supplicant/scan.h b/wpa_supplicant/scan.h
index 5096287..098f0f3 100644 (file)
--- a/wpa_supplicant/scan.h
+++ b/wpa_supplicant/scan.h
@@ -32,5 +32,7 @@ struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
                                             u32 vendor_type);
 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
                                      const u8 *bssid);
+void scan_only_handler(struct wpa_supplicant *wpa_s,
+                      struct wpa_scan_results *scan_res);
 
 #endif /* SCAN_H */

diff --git a/wpa_supplicant/wpa_cli.c b/wpa_supplicant/wpa_cli.c
index cc08009..2278138 100644 (file)
--- a/wpa_supplicant/wpa_cli.c
+++ b/wpa_supplicant/wpa_cli.c
@@ -1459,6 +1459,8 @@ static int wpa_cli_cmd_save_config(struct wpa_ctrl *ctrl, int argc,
 
 static int wpa_cli_cmd_scan(struct wpa_ctrl *ctrl, int argc, char *argv[])
 {
+       if (argc > 0)
+               return wpa_cli_cmd(ctrl, "SCAN", 1, argc, argv);
        return wpa_ctrl_command(ctrl, "SCAN");
 }