src/openvpn/interval.c

/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single TCP/UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif

#include "syshead.h"

#include "interval.h"

#include "memdbg.h"

void
interval_init(struct interval *top, int horizon, int refresh)
{
    CLEAR(*top);
    top->refresh = refresh;
    top->horizon = horizon;
}

bool
event_timeout_trigger(struct event_timeout *et,
                      struct timeval *tv,
                      const int et_const_retry)
{
    bool ret = false;
    const time_t local_now = now;

    if (et->defined)
    {
        time_t wakeup = et->last - local_now + et->n;
        if (wakeup <= 0)
        {
#if INTERVAL_DEBUG
            dmsg(D_INTERVAL, "EVENT event_timeout_trigger (%d) etcr=%d", et->n,
                 et_const_retry);
#endif
            if (et_const_retry < 0)
            {
                et->last = local_now;
                wakeup = et->n;
                ret = true;
            }
            else
            {
                wakeup = et_const_retry;
            }
        }

        if (tv && wakeup < tv->tv_sec)
        {
#if INTERVAL_DEBUG
            dmsg(D_INTERVAL, "EVENT event_timeout_wakeup (%d/%d) etcr=%d",
                 (int) wakeup, et->n, et_const_retry);
#endif
            tv->tv_sec = wakeup;
            tv->tv_usec = 0;
        }
    }
    return ret;
}