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authorAlberto Gonzalez Iniesta <agi@inittab.org>2012-11-05 16:28:09 +0100
committerAlberto Gonzalez Iniesta <agi@inittab.org>2012-11-05 16:28:09 +0100
commit8dd0350e1607aa30f7a043c8d5ec7a7eeb874115 (patch)
tree566d0620eb693320cb121dfd93a5675fa704a30b /otime.c
parent349cfa7acb95abe865209a28e417ec74b56f9bba (diff)
Imported Upstream version 2.3_rc1
Diffstat (limited to 'otime.c')
-rw-r--r--otime.c273
1 files changed, 0 insertions, 273 deletions
diff --git a/otime.c b/otime.c
deleted file mode 100644
index b295646..0000000
--- a/otime.c
+++ /dev/null
@@ -1,273 +0,0 @@
-/*
- * 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) 2002-2010 OpenVPN Technologies, 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 (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include "syshead.h"
-
-#include "otime.h"
-
-#include "memdbg.h"
-
-time_t now = 0; /* GLOBAL */
-
-#if TIME_BACKTRACK_PROTECTION && defined(HAVE_GETTIMEOFDAY)
-
-static time_t now_adj = 0; /* GLOBAL */
-time_t now_usec = 0; /* GLOBAL */
-
-/*
- * Try to filter out time instability caused by the system
- * clock backtracking or jumping forward.
- */
-
-void
-update_now (const time_t system_time)
-{
- const int forward_threshold = 86400; /* threshold at which to dampen forward jumps */
- const int backward_trigger = 10; /* backward jump must be >= this many seconds before we adjust */
- time_t real_time = system_time + now_adj;
-
- if (real_time > now)
- {
- const time_t overshoot = real_time - now - 1;
- if (overshoot > forward_threshold && now_adj >= overshoot)
- {
- now_adj -= overshoot;
- real_time -= overshoot;
- }
- now = real_time;
- }
- else if (real_time < now - backward_trigger)
- now_adj += (now - real_time);
-}
-
-void
-update_now_usec (struct timeval *tv)
-{
- const time_t last = now;
- update_now (tv->tv_sec);
- if (now > last || (now == last && tv->tv_usec > now_usec))
- now_usec = tv->tv_usec;
-}
-
-#endif /* TIME_BACKTRACK_PROTECTION && defined(HAVE_GETTIMEOFDAY) */
-
-/*
- * Return a numerical string describing a struct timeval.
- */
-const char *
-tv_string (const struct timeval *tv, struct gc_arena *gc)
-{
- struct buffer out = alloc_buf_gc (64, gc);
- buf_printf (&out, "[%d/%d]",
- (int) tv->tv_sec,
- (int )tv->tv_usec);
- return BSTR (&out);
-}
-
-/*
- * Return an ascii string describing an absolute
- * date/time in a struct timeval.
- *
- */
-const char *
-tv_string_abs (const struct timeval *tv, struct gc_arena *gc)
-{
- return time_string ((time_t) tv->tv_sec,
- (int) tv->tv_usec,
- true,
- gc);
-}
-
-/* format a time_t as ascii, or use current time if 0 */
-
-const char *
-time_string (time_t t, int usec, bool show_usec, struct gc_arena *gc)
-{
- struct buffer out = alloc_buf_gc (64, gc);
- struct timeval tv;
-
- if (t)
- {
- tv.tv_sec = t;
- tv.tv_usec = usec;
- }
- else
- {
-#ifdef HAVE_GETTIMEOFDAY
- if (gettimeofday (&tv, NULL))
-#endif
- {
- tv.tv_sec = time (NULL);
- tv.tv_usec = 0;
- }
- }
-
- t = tv.tv_sec;
- buf_printf (&out, "%s", ctime(&t));
- buf_rmtail (&out, '\n');
-
- if (show_usec && tv.tv_usec)
- buf_printf (&out, " us=%d", (int)tv.tv_usec);
-
- return BSTR (&out);
-}
-
-/*
- * Limit the frequency of an event stream.
- *
- * Used to control maximum rate of new
- * incoming connections.
- */
-
-struct frequency_limit *
-frequency_limit_init (int max, int per)
-{
- struct frequency_limit *f;
-
- ASSERT (max >= 0 && per >= 0);
-
- ALLOC_OBJ (f, struct frequency_limit);
- f->max = max;
- f->per = per;
- f->n = 0;
- f->reset = 0;
- return f;
-}
-
-void
-frequency_limit_free (struct frequency_limit *f)
-{
- free (f);
-}
-
-bool
-frequency_limit_event_allowed (struct frequency_limit *f)
-{
- if (f->per)
- {
- bool ret;
- if (now >= f->reset + f->per)
- {
- f->reset = now;
- f->n = 0;
- }
- ret = (++f->n <= f->max);
- return ret;
- }
- else
- return true;
-}
-
-#ifdef WIN32
-
-static time_t gtc_base = 0;
-static DWORD gtc_last = 0;
-static time_t last_sec = 0;
-static unsigned int last_msec = 0;
-static bool bt_last = false;
-
-static void
-gettimeofday_calibrate (void)
-{
- const time_t t = time(NULL);
- const DWORD gtc = GetTickCount();
- gtc_base = t - gtc/1000;
- gtc_last = gtc;
-}
-
-/*
- * Rewritten by JY for OpenVPN 2.1, after I realized that
- * QueryPerformanceCounter takes nearly 2 orders of magnitude
- * more processor cycles than GetTickCount.
- */
-int
-gettimeofday (struct timeval *tv, void *tz)
-{
- const DWORD gtc = GetTickCount();
- bool bt = false;
- time_t sec;
- unsigned int msec;
- const int backtrack_hold_seconds = 10;
-
- /* recalibrate at the dreaded 49.7 day mark */
- if (!gtc_base || gtc < gtc_last)
- gettimeofday_calibrate ();
- gtc_last = gtc;
-
- sec = gtc_base + gtc / 1000;
- msec = gtc % 1000;
-
- if (sec == last_sec)
- {
- if (msec < last_msec)
- {
- msec = last_msec;
- bt = true;
- }
- }
- else if (sec < last_sec)
- {
- /* We try to dampen out backtracks of less than backtrack_hold_seconds.
- Larger backtracks will be passed through and dealt with by the
- TIME_BACKTRACK_PROTECTION code (if enabled) */
- if (sec > last_sec - backtrack_hold_seconds)
- {
- sec = last_sec;
- msec = last_msec;
- }
- bt = true;
- }
-
- tv->tv_sec = last_sec = sec;
- tv->tv_usec = (last_msec = msec) * 1000;
-
- if (bt && !bt_last)
- gettimeofday_calibrate ();
- bt_last = bt;
-
- return 0;
-}
-
-#endif /* WIN32 */
-
-#ifdef TIME_TEST
-void
-time_test (void)
-{
- struct timeval tv;
- time_t t;
- int i;
- for (i = 0; i < 10000; ++i)
- {
- t = time(NULL);
- gettimeofday (&tv, NULL);
-#if 1
- msg (M_INFO, "t=%u s=%u us=%u",
- (unsigned int)t,
- (unsigned int)tv.tv_sec,
- (unsigned int)tv.tv_usec);
-#endif
- }
-}
-#endif