diff options
Diffstat (limited to 'otime.c')
| -rw-r--r-- | otime.c | 273 |
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 |