1 files changed, 263 insertions, 0 deletions
diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
new file mode 100644
index 000000000000..67e2282efd72
--- /dev/null
+++ b/wpa_supplicant/scan.c
@@ -0,0 +1,263 @@
+/*
+ * WPA Supplicant - Scanning
+ * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "eloop.h"
+#include "config.h"
+#include "wpa_supplicant_i.h"
+#include "mlme.h"
+#include "wps_supplicant.h"
+
+
+static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
+{
+	struct wpa_ssid *ssid;
+	union wpa_event_data data;
+
+	ssid = wpa_supplicant_get_ssid(wpa_s);
+	if (ssid == NULL)
+		return;
+
+	if (wpa_s->current_ssid == NULL)
+		wpa_s->current_ssid = ssid;
+	wpa_supplicant_initiate_eapol(wpa_s);
+	wpa_printf(MSG_DEBUG, "Already associated with a configured network - "
+		   "generating associated event");
+	os_memset(&data, 0, sizeof(data));
+	wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
+}
+
+
+#ifdef CONFIG_WPS
+static int wpas_wps_in_use(struct wpa_config *conf,
+			   enum wps_request_type *req_type)
+{
+	struct wpa_ssid *ssid;
+	int wps = 0;
+
+	for (ssid = conf->ssid; ssid; ssid = ssid->next) {
+		if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
+			continue;
+
+		wps = 1;
+		*req_type = wpas_wps_get_req_type(ssid);
+		if (!ssid->eap.phase1)
+			continue;
+
+		if (os_strstr(ssid->eap.phase1, "pbc=1"))
+			return 2;
+	}
+
+	return wps;
+}
+#endif /* CONFIG_WPS */
+
+static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
+{
+	struct wpa_supplicant *wpa_s = eloop_ctx;
+	struct wpa_ssid *ssid;
+	int enabled, scan_req = 0, ret;
+	struct wpabuf *wps_ie = NULL;
+	const u8 *extra_ie = NULL;
+	size_t extra_ie_len = 0;
+	int wps = 0;
+#ifdef CONFIG_WPS
+	enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
+#endif /* CONFIG_WPS */
+
+	if (wpa_s->disconnected && !wpa_s->scan_req)
+		return;
+
+	enabled = 0;
+	ssid = wpa_s->conf->ssid;
+	while (ssid) {
+		if (!ssid->disabled) {
+			enabled++;
+			break;
+		}
+		ssid = ssid->next;
+	}
+	if (!enabled && !wpa_s->scan_req) {
+		wpa_printf(MSG_DEBUG, "No enabled networks - do not scan");
+		wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
+		return;
+	}
+	scan_req = wpa_s->scan_req;
+	wpa_s->scan_req = 0;
+
+	if (wpa_s->conf->ap_scan != 0 &&
+	    wpa_s->driver && IS_WIRED(wpa_s->driver)) {
+		wpa_printf(MSG_DEBUG, "Using wired authentication - "
+			   "overriding ap_scan configuration");
+		wpa_s->conf->ap_scan = 0;
+	}
+
+	if (wpa_s->conf->ap_scan == 0) {
+		wpa_supplicant_gen_assoc_event(wpa_s);
+		return;
+	}
+
+	if (wpa_s->wpa_state == WPA_DISCONNECTED ||
+	    wpa_s->wpa_state == WPA_INACTIVE)
+		wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
+
+	ssid = wpa_s->conf->ssid;
+	if (wpa_s->prev_scan_ssid != BROADCAST_SSID_SCAN) {
+		while (ssid) {
+			if (ssid == wpa_s->prev_scan_ssid) {
+				ssid = ssid->next;
+				break;
+			}
+			ssid = ssid->next;
+		}
+	}
+	while (ssid) {
+		if (!ssid->disabled &&
+		    (ssid->scan_ssid || wpa_s->conf->ap_scan == 2))
+			break;
+		ssid = ssid->next;
+	}
+
+	if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
+		/*
+		 * ap_scan=2 mode - try to associate with each SSID instead of
+		 * scanning for each scan_ssid=1 network.
+		 */
+		if (ssid == NULL) {
+			wpa_printf(MSG_DEBUG, "wpa_supplicant_scan: Reached "
+				   "end of scan list - go back to beginning");
+			wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
+			wpa_supplicant_req_scan(wpa_s, 0, 0);
+			return;
+		}
+		if (ssid->next) {
+			/* Continue from the next SSID on the next attempt. */
+			wpa_s->prev_scan_ssid = ssid;
+		} else {
+			/* Start from the beginning of the SSID list. */
+			wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
+		}
+		wpa_supplicant_associate(wpa_s, NULL, ssid);
+		return;
+	}
+
+	wpa_printf(MSG_DEBUG, "Starting AP scan (%s SSID)",
+		   ssid ? "specific": "broadcast");
+	if (ssid) {
+		wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
+				  ssid->ssid, ssid->ssid_len);
+		wpa_s->prev_scan_ssid = ssid;
+	} else
+		wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
+
+#ifdef CONFIG_WPS
+	wps = wpas_wps_in_use(wpa_s->conf, &req_type);
+#endif /* CONFIG_WPS */
+
+	if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
+	    !wpa_s->use_client_mlme && wps != 2) {
+		wpa_s->scan_res_tried++;
+		wpa_s->scan_req = scan_req;
+		wpa_printf(MSG_DEBUG, "Trying to get current scan results "
+			   "first without requesting a new scan to speed up "
+			   "initial association");
+		wpa_supplicant_event(wpa_s, EVENT_SCAN_RESULTS, NULL);
+		return;
+	}
+
+#ifdef CONFIG_WPS
+	if (wps) {
+		wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev,
+						wpa_s->wps->uuid, req_type);
+		if (wps_ie) {
+			extra_ie = wpabuf_head(wps_ie);
+			extra_ie_len = wpabuf_len(wps_ie);
+		}
+	}
+#endif /* CONFIG_WPS */
+
+	if (wpa_s->use_client_mlme) {
+		ieee80211_sta_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len);
+		ret = ieee80211_sta_req_scan(wpa_s, ssid ? ssid->ssid : NULL,
+					     ssid ? ssid->ssid_len : 0);
+	} else {
+		wpa_drv_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len);
+		ret = wpa_drv_scan(wpa_s, ssid ? ssid->ssid : NULL,
+				   ssid ? ssid->ssid_len : 0);
+	}
+
+	wpabuf_free(wps_ie);
+
+	if (ret) {
+		wpa_printf(MSG_WARNING, "Failed to initiate AP scan.");
+		wpa_supplicant_req_scan(wpa_s, 10, 0);
+	} else
+		wpa_s->scan_runs++;
+}
+
+
+/**
+ * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @sec: Number of seconds after which to scan
+ * @usec: Number of microseconds after which to scan
+ *
+ * This function is used to schedule a scan for neighboring access points after
+ * the specified time.
+ */
+void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
+{
+	/* If there's at least one network that should be specifically scanned
+	 * then don't cancel the scan and reschedule.  Some drivers do
+	 * background scanning which generates frequent scan results, and that
+	 * causes the specific SSID scan to get continually pushed back and
+	 * never happen, which causes hidden APs to never get probe-scanned.
+	 */
+	if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
+	    wpa_s->conf->ap_scan == 1) {
+		struct wpa_ssid *ssid = wpa_s->conf->ssid;
+
+		while (ssid) {
+			if (!ssid->disabled && ssid->scan_ssid)
+				break;
+			ssid = ssid->next;
+		}
+		if (ssid) {
+			wpa_msg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
+			        "ensure that specific SSID scans occur");
+			return;
+		}
+	}
+
+	wpa_msg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
+		sec, usec);
+	eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
+	eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
+}
+
+
+/**
+ * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function is used to cancel a scan request scheduled with
+ * wpa_supplicant_req_scan().
+ */
+void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
+{
+	wpa_msg(wpa_s, MSG_DEBUG, "Cancelling scan request");
+	eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
+}