int eloop_register_timeout(unsigned int secs, unsigned int usecs,
			   eloop_timeout_handler handler,
			   void *eloop_data, void *user_data)
{
	struct eloop_timeout *timeout, *tmp, *prev;
	os_time_t now_sec;

	timeout = os_malloc(sizeof(*timeout));
	if (timeout == NULL)
		return -1;
	os_get_time(&timeout->time);
	now_sec = timeout->time.sec;
	timeout->time.sec += secs;
	if (timeout->time.sec < now_sec) {
		/*
		 * Integer overflow - assume long enough timeout to be assumed
		 * to be infinite, i.e., the timeout would never happen.
		 */
		wpa_printf(MSG_DEBUG, "ELOOP: Too long timeout (secs=%u) to "
			   "ever happen - ignore it", secs);
		os_free(timeout);
		return 0;
	}
	timeout->time.usec += usecs;
	while (timeout->time.usec >= 1000000) {
		timeout->time.sec++;
		timeout->time.usec -= 1000000;
	}
	timeout->eloop_data = eloop_data;
	timeout->user_data = user_data;
	timeout->handler = handler;
	timeout->next = NULL;

	if (eloop.timeout == NULL) {
		eloop.timeout = timeout;
		return 0;
	}

	prev = NULL;
	tmp = eloop.timeout;
	while (tmp != NULL) {
		if (os_time_before(&timeout->time, &tmp->time))
			break;
		prev = tmp;
		tmp = tmp->next;
	}

	if (prev == NULL) {
		timeout->next = eloop.timeout;
		eloop.timeout = timeout;
	} else {
		timeout->next = prev->next;
		prev->next = timeout;
	}

	return 0;
}

int os_get_reltime(struct os_reltime *t)
{
	/* consider using performance counters or so instead */
	struct os_time now;
	int res = os_get_time(&now);
	t->sec = now.sec;
	t->usec = now.usec;
	return res;
}

/**
 * hostapd_acl_expire - ACL cache expiration callback
 * @eloop_ctx: struct hostapd_data *
 * @timeout_ctx: Not used
 */
static void hostapd_acl_expire(void *eloop_ctx, void *timeout_ctx)
{
	struct hostapd_data *hapd = eloop_ctx;
	struct os_time now;

	os_get_time(&now);
	hostapd_acl_expire_cache(hapd, now.sec);
	hostapd_acl_expire_queries(hapd, now.sec);

	eloop_register_timeout(10, 0, hostapd_acl_expire, hapd, NULL);
}

int wpa_supplicant_may_scan(struct wpa_supplicant *wpa_s)
{
	struct os_time time;

	if (wpa_s->conf->scan_cache > 0) {
		os_get_time(&time);
		time.sec -= wpa_s->conf->scan_cache;
		if (os_time_before(&time, &wpa_s->last_scan_results))
			return 0;
	}
	return 1;
}

static void radius_client_list_add(struct radius_client_data *radius,
				   struct radius_msg *msg,
				   RadiusType msg_type, u8 *shared_secret,
				   size_t shared_secret_len, const u8 *addr)
{
	struct radius_msg_list *entry, *prev;

	if (eloop_terminated()) {
		/* No point in adding entries to retransmit queue since event
		 * loop has already been terminated. */
		radius_msg_free(msg);
		os_free(msg);
		return;
	}

	entry = os_zalloc(sizeof(*entry));
	if (entry == NULL) {
		printf("Failed to add RADIUS packet into retransmit list\n");
		radius_msg_free(msg);
		os_free(msg);
		return;
	}

	if (addr)
		os_memcpy(entry->addr, addr, ETH_ALEN);
	entry->msg = msg;
	entry->msg_type = msg_type;
	entry->shared_secret = shared_secret;
	entry->shared_secret_len = shared_secret_len;
	os_get_time(&entry->last_attempt);
	entry->first_try = entry->last_attempt.sec;
	entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
	entry->attempts = 1;
	entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
	entry->next = radius->msgs;
	radius->msgs = entry;
	radius_client_update_timeout(radius);

	if (radius->num_msgs >= RADIUS_CLIENT_MAX_ENTRIES) {
		printf("Removing the oldest un-ACKed RADIUS packet due to "
		       "retransmit list limits.\n");
		prev = NULL;
		while (entry->next) {
			prev = entry;
			entry = entry->next;
		}
		if (prev) {
			prev->next = NULL;
			radius_client_msg_free(entry);
		}
	} else
		radius->num_msgs++;
}

void Gui::exec() {
    os_mutex_unlock(gui_mutex);
    fps = 60.0;
    double last_time = os_get_time();
    while (_running) {
        os_mutex_lock(gui_mutex);
        genesis_flush_events(_genesis_context);
        glfwPollEvents();
        events.trigger(EventFlushEvents);
        os_mutex_unlock(gui_mutex);

        _utility_window->draw();

        double this_time = os_get_time();
        double delta = this_time - last_time;
        last_time = this_time;
        double this_fps = 1.0 / delta;
        fps = fps * 0.90 + this_fps * 0.10;
    }
    os_mutex_lock(gui_mutex);
}

static void ap_list_timer(void *eloop_ctx, void *timeout_ctx)
{
	struct hostapd_iface *iface = eloop_ctx;
	struct os_time now;
	struct ap_info *ap;
	int set_beacon = 0;

	eloop_register_timeout(10, 0, ap_list_timer, iface, NULL);

	if (!iface->ap_list)
		return;

	os_get_time(&now);

	while (iface->ap_list) {
		ap = iface->ap_list->prev;
		if (ap->last_beacon + iface->conf->ap_table_expiration_time >=
		    now.sec)
			break;

		ap_free_ap(iface, ap);
	}

	if (iface->olbc || iface->olbc_ht) {
		int olbc = 0;
		int olbc_ht = 0;

		ap = iface->ap_list;
		while (ap && (olbc == 0 || olbc_ht == 0)) {
			if (ap_list_beacon_olbc(iface, ap))
				olbc = 1;
			if (!ap->ht_support)
				olbc_ht = 1;
			ap = ap->next;
		}
		if (!olbc && iface->olbc) {
			wpa_printf(MSG_DEBUG, "OLBC not detected anymore");
			iface->olbc = 0;
			set_beacon++;
		}
#ifdef CONFIG_IEEE80211N
		if (!olbc_ht && iface->olbc_ht) {
			wpa_printf(MSG_DEBUG, "OLBC HT not detected anymore");
			iface->olbc_ht = 0;
			hostapd_ht_operation_update(iface);
			set_beacon++;
		}
#endif /* CONFIG_IEEE80211N */
	}

	if (set_beacon)
		ieee802_11_update_beacons(iface);
}

struct radius_server_data *
radius_server_init(struct radius_server_conf *conf)
{
	struct radius_server_data *data;

#ifndef CONFIG_IPV6
	if (conf->ipv6) {
		fprintf(stderr, "RADIUS server compiled without IPv6 "
			"support.\n");
		return NULL;
	}
#endif /* CONFIG_IPV6 */

	data = wpa_zalloc(sizeof(*data));
	if (data == NULL)
		return NULL;

	os_get_time(&data->start_time);
	data->hostapd_conf = conf->hostapd_conf;
	data->eap_sim_db_priv = conf->eap_sim_db_priv;
	data->ssl_ctx = conf->ssl_ctx;
	data->ipv6 = conf->ipv6;

	data->clients = radius_server_read_clients(conf->client_file,
						   conf->ipv6);
	if (data->clients == NULL) {
		printf("No RADIUS clients configured.\n");
		radius_server_deinit(data);
		return NULL;
	}

#ifdef CONFIG_IPV6
	if (conf->ipv6)
		data->auth_sock = radius_server_open_socket6(conf->auth_port);
	else
#endif /* CONFIG_IPV6 */
	data->auth_sock = radius_server_open_socket(conf->auth_port);
	if (data->auth_sock < 0) {
		printf("Failed to open UDP socket for RADIUS authentication "
		       "server\n");
		radius_server_deinit(data);
		return NULL;
	}
	if (eloop_register_read_sock(data->auth_sock,
				     radius_server_receive_auth,
				     data, NULL)) {
		radius_server_deinit(data);
		return NULL;
	}

	return data;
}

int hostapd_update_time_adv(struct hostapd_data *hapd)
{
	const int elen = 2 + 1 + 10 + 5 + 1;
	struct os_time t;
	struct os_tm tm;
	u8 *pos;

	if (hapd->conf->time_advertisement != 2)
		return 0;

	if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
		return -1;

	if (!hapd->time_adv) {
		hapd->time_adv = wpabuf_alloc(elen);
		if (hapd->time_adv == NULL)
			return -1;
		pos = wpabuf_put(hapd->time_adv, elen);
	} else
		pos = wpabuf_mhead_u8(hapd->time_adv);

	*pos++ = WLAN_EID_TIME_ADVERTISEMENT;
	*pos++ = 1 + 10 + 5 + 1;

	*pos++ = 2; /* UTC time at which the TSF timer is 0 */

	/* Time Value at TSF 0 */
	/* FIX: need to calculate this based on the current TSF value */
	WPA_PUT_LE16(pos, tm.year); /* Year */
	pos += 2;
	*pos++ = tm.month; /* Month */
	*pos++ = tm.day; /* Day of month */
	*pos++ = tm.hour; /* Hours */
	*pos++ = tm.min; /* Minutes */
	*pos++ = tm.sec; /* Seconds */
	WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
	pos += 2;
	*pos++ = 0; /* Reserved */

	/* Time Error */
	/* TODO: fill in an estimate on the error */
	*pos++ = 0;
	*pos++ = 0;
	*pos++ = 0;
	*pos++ = 0;
	*pos++ = 0;

	*pos++ = hapd->time_update_counter++;

	return 0;
}

static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx)
{
	struct rsn_pmksa_cache *pmksa = eloop_ctx;
	struct os_time now;

	os_get_time(&now);
	while (pmksa->pmksa && pmksa->pmksa->expiration <= now.sec) {
		wpa_printf(MSG_DEBUG, "RSN: expired PMKSA cache entry for "
			   MACSTR, MAC2STR(pmksa->pmksa->spa));
		pmksa_cache_free_entry(pmksa, pmksa->pmksa);
	}

	pmksa_cache_set_expiration(pmksa);
}

static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa)
{
	int sec;
	struct os_time now;

	eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL);
	if (pmksa->pmksa == NULL)
		return;
	os_get_time(&now);
	sec = pmksa->pmksa->expiration - now.sec;
	if (sec < 0)
		sec = 0;
	eloop_register_timeout(sec + 1, 0, pmksa_cache_expire, pmksa, NULL);
}

static int radius_client_retransmit(struct radius_client_data *radius,
                                    struct radius_msg_list *entry,
                                    os_time_t now)
{
    struct hostapd_radius_servers *conf = radius->conf;
    int s;
    struct wpabuf *buf;

    if (entry->msg_type == RADIUS_ACCT ||
            entry->msg_type == RADIUS_ACCT_INTERIM) {
        s = radius->acct_sock;
        if (entry->attempts == 0)
            conf->acct_server->requests++;
        else {
            conf->acct_server->timeouts++;
            conf->acct_server->retransmissions++;
        }
    } else {
        s = radius->auth_sock;
        if (entry->attempts == 0)
            conf->auth_server->requests++;
        else {
            conf->auth_server->timeouts++;
            conf->auth_server->retransmissions++;
        }
    }

    /* retransmit; remove entry if too many attempts */
    entry->attempts++;
    hostapd_logger(radius->ctx, entry->addr, HOSTAPD_MODULE_RADIUS,
                   HOSTAPD_LEVEL_DEBUG, "Resending RADIUS message (id=%d)",
                   radius_msg_get_hdr(entry->msg)->identifier);

    os_get_time(&entry->last_attempt);
    buf = radius_msg_get_buf(entry->msg);
    if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0)
        radius_client_handle_send_error(radius, s, entry->msg_type);

    entry->next_try = now + entry->next_wait;
    entry->next_wait *= 2;
    if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT)
        entry->next_wait = RADIUS_CLIENT_MAX_WAIT;
    if (entry->attempts >= RADIUS_CLIENT_MAX_RETRIES) {
        printf("Removing un-ACKed RADIUS message due to too many "
               "failed retransmit attempts\n");
        return 1;
    }

    return 0;
}

int eloop_register_timeout(unsigned int secs, unsigned int usecs,
			   eloop_timeout_handler handler,
			   void *eloop_data, void *user_data)
{
	struct eloop_timeout *timeout, *tmp;
	os_time_t now_sec;

	timeout = os_zalloc(sizeof(*timeout));
	if (timeout == NULL)
		return -1;
	if (os_get_time(&timeout->time) < 0) {
		os_free(timeout);
		return -1;
	}
	now_sec = timeout->time.sec;
	timeout->time.sec += secs;
	if (timeout->time.sec < now_sec) {
		/*
		 * Integer overflow - assume long enough timeout to be assumed
		 * to be infinite, i.e., the timeout would never happen.
		 */
		wpa_printf(MSG_DEBUG, "ELOOP: Too long timeout (secs=%u) to "
			   "ever happen - ignore it", secs);
		os_free(timeout);
		return 0;
	}
	timeout->time.usec += usecs;
	while (timeout->time.usec >= 1000000) {
		timeout->time.sec++;
		timeout->time.usec -= 1000000;
	}
	timeout->eloop_data = eloop_data;
	timeout->user_data = user_data;
	timeout->handler = handler;
	wpa_trace_add_ref(timeout, eloop, eloop_data);
	wpa_trace_add_ref(timeout, user, user_data);
	wpa_trace_record(timeout);

	/* Maintain timeouts in order of increasing time */
	dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) {
		if (os_time_before(&timeout->time, &tmp->time)) {
			dl_list_add(tmp->list.prev, &timeout->list);
			return 0;
		}
	}
	dl_list_add_tail(&eloop.timeout, &timeout->list);

	return 0;
}

/**
 * wps_generate_pin - Generate a random PIN
 * Returns: Eight digit PIN (i.e., including the checksum digit)
 */
unsigned int wps_generate_pin(void)
{
	unsigned int val;

	/* Generate seven random digits for the PIN */
	if (random_get_bytes((unsigned char *) &val, sizeof(val)) < 0) {
		struct os_time now;
		os_get_time(&now);
		val = os_random() ^ now.sec ^ now.usec;
	}
	val %= 10000000;

	/* Append checksum digit */
	return val * 10 + wps_pin_checksum(val);
}

int eloop_register_timeout(unsigned int secs, unsigned int usecs,
               eloop_timeout_handler handler,
               void *eloop_data, void *user_data)
{
    struct eloop_timeout *timeout, *tmp, *prev;

    timeout = os_malloc(sizeof(*timeout));
    if (timeout == NULL)
        return -1;
    if (os_get_time(&timeout->time) < 0) {
        os_free(timeout);
        return -1;
    }
    timeout->time.sec += secs;
    timeout->time.usec += usecs;
    while (timeout->time.usec >= 1000000) {
        timeout->time.sec++;
        timeout->time.usec -= 1000000;
    }
    timeout->eloop_data = eloop_data;
    timeout->user_data = user_data;
    timeout->handler = handler;
    timeout->next = NULL;

    if (eloop.timeout == NULL) {
        eloop.timeout = timeout;
        return 0;
    }

    prev = NULL;
    tmp = eloop.timeout;
    while (tmp != NULL) {
        if (os_time_before(&timeout->time, &tmp->time))
            break;
        prev = tmp;
        tmp = tmp->next;
    }

    if (prev == NULL) {
        timeout->next = eloop.timeout;
        eloop.timeout = timeout;
    } else {
        timeout->next = prev->next;
        prev->next = timeout;
    }

    return 0;
}

void wpa_debug_print_timestamp(void)
{
	struct os_time tv;

	if (!wpa_debug_timestamp)
		return;

	os_get_time(&tv);
#ifdef CONFIG_DEBUG_FILE
	if (out_file) {
		fprintf(out_file, "%ld.%06u: ", (long) tv.sec,
			(unsigned int) tv.usec);
	} else
#endif /* CONFIG_DEBUG_FILE */
	printf("%ld.%06u: ", (long) tv.sec, (unsigned int) tv.usec);
}

/**
 * pmksa_cache_auth_add - Add a PMKSA cache entry
 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
 * @pmk: The new pairwise master key
 * @pmk_len: PMK length in bytes, usually PMK_LEN (32)
 * @aa: Authenticator address
 * @spa: Supplicant address
 * @session_timeout: Session timeout
 * @eapol: Pointer to EAPOL state machine data
 * @akmp: WPA_KEY_MGMT_* used in key derivation
 * Returns: Pointer to the added PMKSA cache entry or %NULL on error
 *
 * This function create a PMKSA entry for a new PMK and adds it to the PMKSA
 * cache. If an old entry is already in the cache for the same Supplicant,
 * this entry will be replaced with the new entry. PMKID will be calculated
 * based on the PMK.
 */
struct rsn_pmksa_cache_entry *
pmksa_cache_auth_add(struct rsn_pmksa_cache *pmksa,
		     const u8 *pmk, size_t pmk_len,
		const u8 *aa, const u8 *spa, int session_timeout,
		struct eapol_state_machine *eapol, int akmp)
{
	struct rsn_pmksa_cache_entry *entry, *pos;
	struct os_time now;

	if (pmk_len > PMK_LEN)
		return NULL;

	entry = os_zalloc(sizeof(*entry));
	if (entry == NULL)
		return NULL;
	os_memcpy(entry->pmk, pmk, pmk_len);
	entry->pmk_len = pmk_len;
	rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid,
		  wpa_key_mgmt_sha256(akmp));
	os_get_time(&now);
	entry->expiration = now.sec;
	if (session_timeout > 0)
		entry->expiration += session_timeout;
	else
		entry->expiration += dot11RSNAConfigPMKLifetime;
	entry->akmp = akmp;
	os_memcpy(entry->spa, spa, ETH_ALEN);
	pmksa_cache_from_eapol_data(entry, eapol);

	/* Replace an old entry for the same STA (if found) with the new entry
	 */
	pos = pmksa_cache_auth_get(pmksa, spa, NULL);
	if (pos)
		pmksa_cache_free_entry(pmksa, pos);

	if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) {
		/* Remove the oldest entry to make room for the new entry */
		wpa_printf(MSG_DEBUG, "RSN: removed the oldest PMKSA cache "
			   "entry (for " MACSTR ") to make room for new one",
			   MAC2STR(pmksa->pmksa->spa));
		pmksa_cache_free_entry(pmksa, pmksa->pmksa);
	}

	pmksa_cache_link_entry(pmksa, entry);

	return entry;
}

/**
 * accounting_init: Initialize accounting
 * @hapd: hostapd BSS data
 * Returns: 0 on success, -1 on failure
 */
int accounting_init(struct hostapd_data *hapd)
{
	struct os_time now;

	/* Acct-Session-Id should be unique over reboots. If reliable clock is
	 * not available, this could be replaced with reboot counter, etc. */
	os_get_time(&now);
	hapd->acct_session_id_hi = now.sec;

	if (radius_client_register(hapd->radius, RADIUS_ACCT,
				   accounting_receive, hapd))
		return -1;

	accounting_report_state(hapd, 1);

	return 0;
}

static int sme_check_sa_query_timeout(struct wpa_supplicant *wpa_s)
{
	u32 tu;
	struct os_time now, passed;
	os_get_time(&now);
	os_time_sub(&now, &wpa_s->sme.sa_query_start, &passed);
	tu = (passed.sec * 1000000 + passed.usec) / 1024;
	if (sa_query_max_timeout < tu) {
		wpa_dbg(wpa_s, MSG_DEBUG, "SME: SA Query timed out");
		sme_stop_sa_query(wpa_s);
		wpa_supplicant_deauthenticate(
			wpa_s, WLAN_REASON_PREV_AUTH_NOT_VALID);
		return 1;
	}

	return 0;
}

static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx)
{
	struct rsn_pmksa_cache *pmksa = eloop_ctx;
	struct os_time now;

	os_get_time(&now);
	while (pmksa->pmksa && pmksa->pmksa->expiration <= now.sec) {
		struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;
		pmksa->pmksa = entry->next;
		wpa_printf(MSG_DEBUG, "RSN: expired PMKSA cache entry for "
			   MACSTR, MAC2STR(entry->aa));
		wpa_sm_remove_pmkid(pmksa->sm, entry->aa, entry->pmkid);
		pmksa_cache_free_entry(pmksa, entry, 0);
	}

	pmksa_cache_set_expiration(pmksa);
}