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[FreeBSD/releng/10.0.git] / contrib / wpa / 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 }