bgscan.c

Go to the documentation of this file.

/*
 * WPA Supplicant - background scan and roaming interface
 * Copyright (c) 2009-2010, 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 "wpa_supplicant_i.h"
#include "config_ssid.h"
#include "bgscan.h"

#ifdef CONFIG_BGSCAN_SIMPLE
extern const struct bgscan_ops bgscan_simple_ops;
#endif /* CONFIG_BGSCAN_SIMPLE */

static const struct bgscan_ops * bgscan_modules[] = {
#ifdef CONFIG_BGSCAN_SIMPLE
        &bgscan_simple_ops,
#endif /* CONFIG_BGSCAN_SIMPLE */
        NULL
};


int bgscan_init(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
{
        const char *name = ssid->bgscan;
        const char *params;
        size_t nlen;
        int i;
        const struct bgscan_ops *ops = NULL;

        bgscan_deinit(wpa_s);
        if (name == NULL)
                return 0;

        params = os_strchr(name, ':');
        if (params == NULL) {
                params = "";
                nlen = os_strlen(name);
        } else {
                nlen = params - name;
                params++;
        }

        for (i = 0; bgscan_modules[i]; i++) {
                if (os_strncmp(name, bgscan_modules[i]->name, nlen) == 0) {
                        ops = bgscan_modules[i];
                        break;
                }
        }

        if (ops == NULL) {
                wpa_printf(MSG_ERROR, "bgscan: Could not find module "
                           "matching the parameter '%s'", name);
                return -1;
        }

        wpa_s->bgscan_priv = ops->init(wpa_s, params, ssid);
        if (wpa_s->bgscan_priv == NULL)
                return -1;
        wpa_s->bgscan = ops;
        wpa_printf(MSG_DEBUG, "bgscan: Initialized module '%s' with "
                   "parameters '%s'", ops->name, params);

        return 0;
}


void bgscan_deinit(struct wpa_supplicant *wpa_s)
{
        if (wpa_s->bgscan && wpa_s->bgscan_priv) {
                wpa_printf(MSG_DEBUG, "bgscan: Deinitializing module '%s'",
                           wpa_s->bgscan->name);
                wpa_s->bgscan->deinit(wpa_s->bgscan_priv);
                wpa_s->bgscan = NULL;
                wpa_s->bgscan_priv = NULL;
        }
}


int bgscan_notify_scan(struct wpa_supplicant *wpa_s)
{
        if (wpa_s->bgscan && wpa_s->bgscan_priv)
                return wpa_s->bgscan->notify_scan(wpa_s->bgscan_priv);
        return 0;
}


void bgscan_notify_beacon_loss(struct wpa_supplicant *wpa_s)
{
        if (wpa_s->bgscan && wpa_s->bgscan_priv)
                wpa_s->bgscan->notify_beacon_loss(wpa_s->bgscan_priv);
}


void bgscan_notify_signal_change(struct wpa_supplicant *wpa_s, int above)
{
        if (wpa_s->bgscan && wpa_s->bgscan_priv)
                wpa_s->bgscan->notify_signal_change(wpa_s->bgscan_priv, above);
}