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-rw-r--r--src/openvpn/otime.h264
1 files changed, 264 insertions, 0 deletions
diff --git a/src/openvpn/otime.h b/src/openvpn/otime.h
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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) 2002-2010 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
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