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* OpenVPN -- An application to securely tunnel IP networks
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* over a single TCP/UDP port, with support for SSL/TLS-based
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* session authentication and key exchange,
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* packet encryption, packet authentication, and
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* Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* The interval_ routines are designed to optimize the calling of a routine
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* (normally tls_multi_process()) which can be called less frequently
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#define INTERVAL_DEBUG 0
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* Designed to limit calls to expensive functions that need to be called
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time_t future_trigger;
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time_t last_test_true;
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void interval_init (struct interval *top, int horizon, int refresh);
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* last_action less than horizon seconds ago
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* OR last_test_true more than refresh seconds ago
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* OR hit future_trigger
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* set wakeup to the number of seconds until a true return
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interval_test (struct interval* top)
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const time_t local_now = now;
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if (top->future_trigger && local_now >= top->future_trigger)
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top->future_trigger = 0;
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if (top->last_action + top->horizon > local_now ||
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top->last_test_true + top->refresh <= local_now ||
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top->last_test_true = local_now;
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dmsg (D_INTERVAL, "INTERVAL interval_test true");
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interval_schedule_wakeup (struct interval* top, interval_t *wakeup)
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const time_t local_now = now;
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interval_earliest_wakeup (wakeup, top->last_test_true + top->refresh, local_now);
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interval_earliest_wakeup (wakeup, top->future_trigger, local_now);
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dmsg (D_INTERVAL, "INTERVAL interval_schedule wakeup=%d", (int)*wakeup);
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* In wakeup seconds, interval_test will return true once.
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interval_future_trigger (struct interval* top, interval_t wakeup) {
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dmsg (D_INTERVAL, "INTERVAL interval_future_trigger %d", (int)wakeup);
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top->future_trigger = now + wakeup;
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* Once an action is triggered, interval_test will remain true for
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interval_action (struct interval* top)
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dmsg (D_INTERVAL, "INTERVAL action");
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top->last_action = now;
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* Measure when n seconds beyond an event have elapsed
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time_t last; /* time of last event */
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event_timeout_defined (const struct event_timeout* et)
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event_timeout_clear (struct event_timeout* et)
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static inline struct event_timeout
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event_timeout_clear_ret ()
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struct event_timeout ret;
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event_timeout_clear (&ret);
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event_timeout_init (struct event_timeout* et, interval_t n, const time_t local_now)
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et->n = (n >= 0) ? n : 0;
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et->last = local_now;
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event_timeout_reset (struct event_timeout* et)
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event_timeout_modify_wakeup (struct event_timeout* et, interval_t n)
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/* note that you might need to call reset_coarse_timers after this */
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et->n = (n >= 0) ? n : 0;
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* This is the principal function for testing and triggering recurring
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* timers and will return true on a timer signal event.
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* If et_const_retry == ETT_DEFAULT and a signal occurs,
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* the function will return true and *et will be armed for the
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* next event. If et_const_retry >= 0 and a signal occurs,
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* *et will not be touched, but *tv will be set to
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* minimum (*tv, et_const_retry) for a future re-test,
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* and the function will return true.
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#define ETT_DEFAULT (-1)
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bool event_timeout_trigger (struct event_timeout *et,
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const int et_const_retry);
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* Measure time intervals in microseconds
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#define USEC_TIMER_MAX 60 /* maximum interval size in seconds */
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#define USEC_TIMER_MAX_USEC (USEC_TIMER_MAX * 1000000)
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struct timeval start;
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#ifdef HAVE_GETTIMEOFDAY
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usec_timer_start (struct usec_timer *obj)
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openvpn_gettimeofday (&obj->start, NULL);
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usec_timer_end (struct usec_timer *obj)
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openvpn_gettimeofday (&obj->end, NULL);
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#endif /* HAVE_GETTIMEOFDAY */
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usec_timer_interval_defined (struct usec_timer *obj)
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return obj->start.tv_sec && obj->end.tv_sec;
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usec_timer_interval (struct usec_timer *obj)
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return tv_subtract (&obj->end, &obj->start, USEC_TIMER_MAX);
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#endif /* INTERVAL_H */