bgscan learn: Add data file for storing learned network information

diff --git a/wpa_supplicant/bgscan_learn.c b/wpa_supplicant/bgscan_learn.c
index 1244856..91ac80d 100644 (file)
--- a/wpa_supplicant/bgscan_learn.c
+++ b/wpa_supplicant/bgscan_learn.c
@@ -31,9 +31,57 @@ struct bgscan_learn_data {
        int short_interval; /* use if signal < threshold */
        int long_interval; /* use if signal > threshold */
        struct os_time last_bgscan;
+       char *fname;
 };
 
 
+static int bgscan_learn_load(struct bgscan_learn_data *data)
+{
+       FILE *f;
+       char buf[128];
+
+       if (data->fname == NULL)
+               return 0;
+
+       f = fopen(data->fname, "r");
+       if (f == NULL)
+               return 0;
+
+       wpa_printf(MSG_DEBUG, "bgscan learn: Loading data from %s",
+                  data->fname);
+
+       if (fgets(buf, sizeof(buf), f) == NULL ||
+           os_strncmp(buf, "wpa_supplicant-bgscan-learn\n", 28) != 0) {
+               wpa_printf(MSG_INFO, "bgscan learn: Invalid data file %s",
+                          data->fname);
+               fclose(f);
+               return -1;
+       }
+
+       fclose(f);
+       return 0;
+}
+
+
+static void bgscan_learn_save(struct bgscan_learn_data *data)
+{
+       FILE *f;
+
+       if (data->fname == NULL)
+               return;
+
+       wpa_printf(MSG_DEBUG, "bgscan learn: Saving data to %s",
+                  data->fname);
+
+       f = fopen(data->fname, "w");
+       if (f == NULL)
+               return;
+       fprintf(f, "wpa_supplicant-bgscan-learn\n");
+
+       fclose(f);
+}
+
+
 static void bgscan_learn_timeout(void *eloop_ctx, void *timeout_ctx)
 {
        struct bgscan_learn_data *data = eloop_ctx;
@@ -85,6 +133,11 @@ static int bgscan_learn_get_params(struct bgscan_learn_data *data,
        }
        pos++;
        data->long_interval = atoi(pos);
+       pos = os_strchr(pos, ':');
+       if (pos) {
+               pos++;
+               data->fname = os_strdup(pos);
+       }
 
        return 0;
 }
@@ -102,6 +155,7 @@ static void * bgscan_learn_init(struct wpa_supplicant *wpa_s,
        data->wpa_s = wpa_s;
        data->ssid = ssid;
        if (bgscan_learn_get_params(data, params) < 0) {
+               os_free(data->fname);
                os_free(data);
                return NULL;
        }
@@ -110,6 +164,12 @@ static void * bgscan_learn_init(struct wpa_supplicant *wpa_s,
        if (data->long_interval <= 0)
                data->long_interval = 30;
 
+       if (bgscan_learn_load(data) < 0) {
+               os_free(data->fname);
+               os_free(data);
+               return NULL;
+       }
+
        wpa_printf(MSG_DEBUG, "bgscan learn: Signal strength threshold %d  "
                   "Short bgscan interval %d  Long bgscan interval %d",
                   data->signal_threshold, data->short_interval,
@@ -131,9 +191,11 @@ static void * bgscan_learn_init(struct wpa_supplicant *wpa_s,
 static void bgscan_learn_deinit(void *priv)
 {
        struct bgscan_learn_data *data = priv;
+       bgscan_learn_save(data);
        eloop_cancel_timeout(bgscan_learn_timeout, data, NULL);
        if (data->signal_threshold)
                wpa_drv_signal_monitor(data->wpa_s, 0, 0);
+       os_free(data->fname);
        os_free(data);
 }