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-rw-r--r--otime.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/otime.c b/otime.c
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index 0000000..ad9cbbf
--- /dev/null
+++ b/otime.c
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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 */