wpa_supplicant/autoscan.c

   1 /*
   2  * WPA Supplicant - auto scan
   3  * Copyright (c) 2012, Intel Corporation. All rights reserved.
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "config.h"
  13 #include "wpa_supplicant_i.h"
  14 #include "bss.h"
  15 #include "scan.h"
  16 #include "autoscan.h"
  17
  18 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL
  19 extern const struct autoscan_ops autoscan_exponential_ops;
  20 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
  21
  22 #ifdef CONFIG_AUTOSCAN_PERIODIC
  23 extern const struct autoscan_ops autoscan_periodic_ops;
  24 #endif /* CONFIG_AUTOSCAN_PERIODIC */
  25
  26 static const struct autoscan_ops * autoscan_modules[] = {
  27 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL
  28         &autoscan_exponential_ops,
  29 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
  30 #ifdef CONFIG_AUTOSCAN_PERIODIC
  31         &autoscan_periodic_ops,
  32 #endif /* CONFIG_AUTOSCAN_PERIODIC */
  33         NULL
  34 };
  35
  36
  37 static void request_scan(struct wpa_supplicant *wpa_s)
  38 {
  39         wpa_s->scan_req = MANUAL_SCAN_REQ;
  40
  41         if (wpa_supplicant_req_sched_scan(wpa_s))
  42                 wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval, 0);
  43 }
  44
  45
  46 int autoscan_init(struct wpa_supplicant *wpa_s, int req_scan)
  47 {
  48         const char *name = wpa_s->conf->autoscan;
  49         const char *params;
  50         size_t nlen;
  51         int i;
  52         const struct autoscan_ops *ops = NULL;
  53
  54         if (wpa_s->autoscan && wpa_s->autoscan_priv)
  55                 return 0;
  56
  57         if (name == NULL)
  58                 return 0;
  59
  60         params = os_strchr(name, ':');
  61         if (params == NULL) {
  62                 params = "";
  63                 nlen = os_strlen(name);
  64         } else {
  65                 nlen = params - name;
  66                 params++;
  67         }
  68
  69         for (i = 0; autoscan_modules[i]; i++) {
  70                 if (os_strncmp(name, autoscan_modules[i]->name, nlen) == 0) {
  71                         ops = autoscan_modules[i];
  72                         break;
  73                 }
  74         }
  75
  76         if (ops == NULL) {
  77                 wpa_printf(MSG_ERROR, "autoscan: Could not find module "
  78                            "matching the parameter '%s'", name);
  79                 return -1;
  80         }
  81
  82         wpa_s->autoscan_params = NULL;
  83
  84         wpa_s->autoscan_priv = ops->init(wpa_s, params);
  85         if (wpa_s->autoscan_priv == NULL)
  86                 return -1;
  87         wpa_s->autoscan = ops;
  88
  89         wpa_printf(MSG_DEBUG, "autoscan: Initialized module '%s' with "
  90                    "parameters '%s'", ops->name, params);
  91         if (!req_scan)
  92                 return 0;
  93
  94         /*
  95          * Cancelling existing scan requests, if any.
  96          */
  97         wpa_supplicant_cancel_sched_scan(wpa_s);
  98         wpa_supplicant_cancel_scan(wpa_s);
  99
 100         /*
 101          * Firing first scan, which will lead to call autoscan_notify_scan.
 102          */
 103         request_scan(wpa_s);
 104
 105         return 0;
 106 }
 107
 108
 109 void autoscan_deinit(struct wpa_supplicant *wpa_s)
 110 {
 111         if (wpa_s->autoscan && wpa_s->autoscan_priv) {
 112                 wpa_printf(MSG_DEBUG, "autoscan: Deinitializing module '%s'",
 113                            wpa_s->autoscan->name);
 114                 wpa_s->autoscan->deinit(wpa_s->autoscan_priv);
 115                 wpa_s->autoscan = NULL;
 116                 wpa_s->autoscan_priv = NULL;
 117
 118                 wpa_s->scan_interval = 5;
 119                 wpa_s->sched_scan_interval = 0;
 120         }
 121 }
 122
 123
 124 int autoscan_notify_scan(struct wpa_supplicant *wpa_s,
 125                          struct wpa_scan_results *scan_res)
 126 {
 127         int interval;
 128
 129         if (wpa_s->autoscan && wpa_s->autoscan_priv) {
 130                 interval = wpa_s->autoscan->notify_scan(wpa_s->autoscan_priv,
 131                                                         scan_res);
 132
 133                 if (interval <= 0)
 134                         return -1;
 135
 136                 wpa_s->scan_interval = interval;
 137                 wpa_s->sched_scan_interval = interval;
 138
 139                 request_scan(wpa_s);
 140         }
 141
 142         return 0;
 143 }