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/*
* 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) 2002-2005 OpenVPN Solutions LLC <info@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
*/
#ifdef WIN32
#include "config-win32.h"
#else
#include "config.h"
#endif
#include "syshead.h"
#include "otime.h"
#include "memdbg.h"
volatile time_t now; /* GLOBAL */
/*
* 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;
}
}
mutex_lock_static (L_CTIME);
buf_printf (&out, "%s", ctime ((const time_t *)&tv.tv_sec));
mutex_unlock_static (L_CTIME);
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 double counterPerMicrosecond = -1.0; /* GLOBAL */
static unsigned __int64 frequency = 0; /* GLOBAL */
static unsigned __int64 timeSecOffset = 0; /* GLOBAL */
static unsigned __int64 startPerformanceCounter = 0; /* GLOBAL */
/*
* gettimeofday for windows
*
* CounterPerMicrosecond is the number of counts per microsecond.
* Double is required if we have less than 1 counter per microsecond. This has not been tested.
* On a PIII 700, I get about 3.579545. This is guaranteed not to change while the processor is running.
* We really don't need to check for loop detection. On my machine it would take about 59645564 days to loop.
* (2^64) / frequency / 60 / 60 / 24.
*
*/
int
gettimeofday(struct timeval *tv, void *tz)
{
unsigned __int64 counter;
QueryPerformanceCounter((LARGE_INTEGER *) &counter);
if (counter < startPerformanceCounter || counterPerMicrosecond == -1.0)
{
time_t t;
mutex_lock (L_GETTIMEOFDAY);
QueryPerformanceFrequency((LARGE_INTEGER *) &frequency);
counterPerMicrosecond = (double) ((__int64) frequency) / 1000000.0f;
time(&t);
QueryPerformanceCounter((LARGE_INTEGER *) &counter);
startPerformanceCounter = counter;
counter /= frequency;
timeSecOffset = t - counter;
mutex_unlock (L_GETTIMEOFDAY);
QueryPerformanceCounter((LARGE_INTEGER *) &counter);
}
tv->tv_sec = (counter / frequency) + timeSecOffset;
tv->tv_usec = ((__int64) (((__int64) counter) / counterPerMicrosecond) % 1000000);
return 0;
}
#endif /* WIN32 */
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