二、wpa_supplicant 初始化的关键函数

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()

在结构体wpa_interface 的注释中提到，wpa_interface将作为此函数的参数。

/** * struct wpa_interface - Parameters for wpa_supplicant_add_iface() *

/ struct wpa_interface { …… }