Imported Upstream version 2.3_rc1

1 files changed, 264 insertions, 0 deletions

diff --git a/src/openvpn/otime.h b/src/openvpn/otime.h
new file mode 100644
index 0000000..4ca1032
--- /dev/null
+++ b/src/openvpn/otime.h
@@ -0,0 +1,264 @@
+/*
+ *  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
+ */
+
+#ifndef OTIME_H
+#define OTIME_H
+
+#include "common.h"
+#include "integer.h"
+#include "buffer.h"
+
+struct frequency_limit
+{
+  int max;
+  int per;
+  int n;
+  time_t reset;
+};
+
+struct frequency_limit *frequency_limit_init (int max, int per);
+void frequency_limit_free (struct frequency_limit *f);
+bool frequency_limit_event_allowed (struct frequency_limit *f);
+
+/* 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 timeval functions */
+
+const char *tv_string (const struct timeval *tv, struct gc_arena *gc);
+const char *tv_string_abs (const struct timeval *tv, struct gc_arena *gc);
+
+extern time_t now; /* updated frequently to time(NULL) */
+
+void time_test (void);
+
+#if TIME_BACKTRACK_PROTECTION
+
+void update_now (const time_t system_time);
+
+extern time_t now_usec;
+void update_now_usec (struct timeval *tv);
+
+static inline int
+openvpn_gettimeofday (struct timeval *tv, void *tz)
+{
+  const int status = gettimeofday (tv, tz);
+  if (!status)
+    {
+      update_now_usec (tv);
+      tv->tv_sec = now;
+      tv->tv_usec = now_usec;
+    }
+  return status;
+}
+
+static inline void
+update_time (void)
+{
+#ifdef WIN32
+  /* on WIN32, gettimeofday is faster than time(NULL) */
+  struct timeval tv;
+  openvpn_gettimeofday (&tv, NULL);
+#else
+  update_now (time (NULL));
+#endif
+}
+
+#else /* !TIME_BACKTRACK_PROTECTION */
+
+static inline void
+update_time (void)
+{
+#if defined(WIN32)
+  /* on WIN32, gettimeofday is faster than time(NULL) */
+  struct timeval tv;
+  if (!gettimeofday (&tv, NULL))
+    {
+      if (tv.tv_sec != now)
+	now = tv.tv_sec;
+    }
+#else
+  const time_t real_time = time (NULL);
+  if (real_time != now)
+    now = real_time;
+#endif
+}
+
+static inline int
+openvpn_gettimeofday (struct timeval *tv, void *tz)
+{
+  return gettimeofday (tv, tz);
+}
+
+#endif /* TIME_BACKTRACK_PROTECTION */
+
+static inline time_t
+openvpn_time (time_t *t)
+{
+  update_time ();
+  if (t)
+    *t = now;
+  return now;
+}
+
+static inline void
+tv_clear (struct timeval *tv)
+{
+  tv->tv_sec = 0;
+  tv->tv_usec = 0;
+}
+
+static inline bool
+tv_defined (const struct timeval *tv)
+{
+  return tv->tv_sec > 0 && tv->tv_usec > 0;
+}
+
+/* return tv1 - tv2 in usec, constrained by max_seconds */
+static inline int
+tv_subtract (const struct timeval *tv1, const struct timeval *tv2, const unsigned int max_seconds)
+{
+  const int max_usec = max_seconds * 1000000;
+  const int sec_diff = tv1->tv_sec - tv2->tv_sec;
+
+  if (sec_diff > ((int)max_seconds + 10))
+    return max_usec;
+  else if (sec_diff < -((int)max_seconds + 10))
+    return -max_usec;
+  return constrain_int (sec_diff * 1000000 + (tv1->tv_usec - tv2->tv_usec), -max_usec, max_usec);
+}
+
+static inline void
+tv_add (struct timeval *dest, const struct timeval *src)
+{
+  dest->tv_sec += src->tv_sec;
+  dest->tv_usec += src->tv_usec;
+  dest->tv_sec += (dest->tv_usec >> 20);
+  dest->tv_usec &= 0x000FFFFF;
+  if (dest->tv_usec >= 1000000)
+    {
+      dest->tv_usec -= 1000000;
+      dest->tv_sec += 1;
+    } 
+}
+
+static inline bool
+tv_lt (const struct timeval *t1, const struct timeval *t2)
+{
+  if (t1->tv_sec < t2->tv_sec)
+    return true;
+  else if (t1->tv_sec > t2->tv_sec)
+    return false;
+  else
+    return t1->tv_usec < t2->tv_usec;
+}
+
+static inline bool
+tv_le (const struct timeval *t1, const struct timeval *t2)
+{
+  if (t1->tv_sec < t2->tv_sec)
+    return true;
+  else if (t1->tv_sec > t2->tv_sec)
+    return false;
+  else
+    return t1->tv_usec <= t2->tv_usec;
+}
+
+static inline bool
+tv_ge (const struct timeval *t1, const struct timeval *t2)
+{
+  if (t1->tv_sec > t2->tv_sec)
+    return true;
+  else if (t1->tv_sec < t2->tv_sec)
+    return false;
+  else
+    return t1->tv_usec >= t2->tv_usec;
+}
+
+static inline bool
+tv_gt (const struct timeval *t1, const struct timeval *t2)
+{
+  if (t1->tv_sec > t2->tv_sec)
+    return true;
+  else if (t1->tv_sec < t2->tv_sec)
+    return false;
+  else
+    return t1->tv_usec > t2->tv_usec;
+}
+
+static inline bool
+tv_eq (const struct timeval *t1, const struct timeval *t2)
+{
+  return t1->tv_sec == t2->tv_sec && t1->tv_usec == t2->tv_usec;
+}
+
+static inline void
+tv_delta (struct timeval *dest, const struct timeval *t1, const struct timeval *t2)
+{
+  int sec = t2->tv_sec - t1->tv_sec;
+  int usec = t2->tv_usec - t1->tv_usec;
+
+  while (usec < 0)
+    {
+      usec += 1000000;
+      sec -= 1;
+    }
+
+  if (sec < 0)
+    usec = sec = 0;
+
+  dest->tv_sec = sec;
+  dest->tv_usec = usec;
+}
+
+#define TV_WITHIN_SIGMA_MAX_SEC 600
+#define TV_WITHIN_SIGMA_MAX_USEC (TV_WITHIN_SIGMA_MAX_SEC * 1000000)
+
+/*
+ * Is t1 and t2 within sigma microseconds of each other?
+ */
+static inline bool
+tv_within_sigma (const struct timeval *t1, const struct timeval *t2, unsigned int sigma)
+{
+  const int delta = tv_subtract (t1, t2, TV_WITHIN_SIGMA_MAX_SEC); /* sigma should be less than 10 minutes */
+  return -(int)sigma <= delta && delta <= (int)sigma;
+}
+
+/*
+ * Used to determine in how many seconds we should be
+ * called again.
+ */
+static inline void
+interval_earliest_wakeup (interval_t *wakeup, time_t at, time_t current) {
+  if (at > current)
+    {
+      const interval_t delta = (interval_t) (at - current);
+      if (delta < *wakeup)
+	*wakeup = delta;
+      if (*wakeup < 0)
+	*wakeup = 0;
+    }
+}
+
+#endif