II. Key functions of wpa_supplicant Initialization

• Struct wpa_global * wpa_supplicant_init (struct wpa_params * Params)
• Struct wpa_supplicant * wpa_supplicant_add_iface (struct wpa_global * Global, struct wpa_interface * iface)

1. wpa_supplicant_init ()

 

 

/** * wpa_supplicant_init - Initialize %wpa_supplicant * @params: Parameters for %wpa_supplicant * Returns: Pointer to global %wpa_supplicant data, or %NULL on failure * * This function is used to initialize %wpa_supplicant. After successful * initialization, the returned data pointer can be used to add and remove * network interfaces, and eventually, to deinitialize %wpa_supplicant. */struct wpa_global * wpa_supplicant_init(struct wpa_params *params){    struct wpa_global *global;    int ret, i;    if (params == NULL)        return NULL;#ifdef CONFIG_DRIVER_NDIS    {        void driver_ndis_init_ops(void);        driver_ndis_init_ops();    }#endif /* CONFIG_DRIVER_NDIS */#ifndef CONFIG_NO_WPA_MSG    wpa_msg_register_ifname_cb(wpa_supplicant_msg_ifname_cb);#endif /* CONFIG_NO_WPA_MSG */    wpa_debug_open_file(params->wpa_debug_file_path);    if (params->wpa_debug_syslog)        wpa_debug_open_syslog();    if (params->wpa_debug_tracing) {        ret = wpa_debug_open_linux_tracing();        if (ret) {            wpa_printf(MSG_ERROR,                   "Failed to enable trace logging");            return NULL;        }    }    ret = eap_register_methods();    if (ret) {        wpa_printf(MSG_ERROR, "Failed to register EAP methods");        if (ret == -2)            wpa_printf(MSG_ERROR, "Two or more EAP methods used "                   "the same EAP type.");        return NULL;    }    global = os_zalloc(sizeof(*global));    if (global == NULL)        return NULL;    dl_list_init(&global->p2p_srv_bonjour);    dl_list_init(&global->p2p_srv_upnp);    global->params.daemonize = params->daemonize;    global->params.wait_for_monitor = params->wait_for_monitor;    global->params.dbus_ctrl_interface = params->dbus_ctrl_interface;    if (params->pid_file)        global->params.pid_file = os_strdup(params->pid_file);    if (params->ctrl_interface)        global->params.ctrl_interface =            os_strdup(params->ctrl_interface);    if (params->override_driver)        global->params.override_driver =            os_strdup(params->override_driver);    if (params->override_ctrl_interface)        global->params.override_ctrl_interface =            os_strdup(params->override_ctrl_interface);    wpa_debug_level = global->params.wpa_debug_level =        params->wpa_debug_level;    wpa_debug_show_keys = global->params.wpa_debug_show_keys =        params->wpa_debug_show_keys;    wpa_debug_timestamp = global->params.wpa_debug_timestamp =        params->wpa_debug_timestamp;    wpa_printf(MSG_DEBUG, "wpa_supplicant v" VERSION_STR);    if (eloop_init()) {        wpa_printf(MSG_ERROR, "Failed to initialize event loop");        wpa_supplicant_deinit(global);        return NULL;    }    random_init(params->entropy_file);    global->ctrl_iface = wpa_supplicant_global_ctrl_iface_init(global);    if (global->ctrl_iface == NULL) {        wpa_supplicant_deinit(global);        return NULL;    }    if (wpas_notify_supplicant_initialized(global)) {        wpa_supplicant_deinit(global);        return NULL;    }    for (i = 0; wpa_drivers[i]; i++)        global->drv_count++;    if (global->drv_count == 0) {        wpa_printf(MSG_ERROR, "No drivers enabled");        wpa_supplicant_deinit(global);        return NULL;    }    global->drv_priv = os_zalloc(global->drv_count * sizeof(void *));    if (global->drv_priv == NULL) {        wpa_supplicant_deinit(global);        return NULL;    }#ifdef CONFIG_WIFI_DISPLAY    if (wifi_display_init(global) < 0) {        wpa_printf(MSG_ERROR, "Failed to initialize Wi-Fi Display");        wpa_supplicant_deinit(global);        return NULL;    }#endif /* CONFIG_WIFI_DISPLAY */    return global;}

2. wpa_supplicant_add_iface ()

In the comment of the wpa_interface struct, wpa_interface serves as the parameter of this function.

/*** Struct wpa_interface-parameters for wpa_supplicant_add_iface ()*

/Struct wpa_interface {...... }