mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
synced 2026-02-11 00:00:08 +08:00
380 lines
9.9 KiB
C++
380 lines
9.9 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
|
|
// over a single port, with support for SSL/TLS-based
|
|
// session authentication and key exchange,
|
|
// packet encryption, packet authentication, and
|
|
// packet compression.
|
|
//
|
|
// Copyright (C) 2012-2017 OpenVPN Inc.
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License Version 3
|
|
// 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 Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program in the COPYING file.
|
|
// If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
// These are our fundamental Time and Time Duration classes.
|
|
// We normally deal with time in units of 1/1024 of a second.
|
|
// This allows us to use 32-bit values to represent most time
|
|
// and time duration values, but still gives us reasonable
|
|
// accuracy. Using units of 1/1024 of a second vs. straight
|
|
// milliseconds gives us an advantage of not needing to do
|
|
// very much integer multiplication and division which can
|
|
// help us on platforms such as ARM that lack integer division
|
|
// instructions. Note that the data type used to store the time
|
|
// is an oulong, so it will automatically expand to 64 bits on
|
|
// 64-bit machines (see olong.hpp). Using a 32-bit
|
|
// data type for time durations is normally fine for clients,
|
|
// but imposes a wraparound limit of ~ 48 days. Servers
|
|
// should always use a 64-bit data type to avoid this
|
|
// limitation.
|
|
|
|
#ifndef OPENVPN_TIME_TIME_H
|
|
#define OPENVPN_TIME_TIME_H
|
|
|
|
#include <limits>
|
|
#include <cstdint> // for std::uint32_t, uint64_t
|
|
|
|
#include <openvpn/common/platform.hpp>
|
|
#include <openvpn/common/exception.hpp>
|
|
#include <openvpn/common/olong.hpp>
|
|
#include <openvpn/common/to_string.hpp>
|
|
|
|
#ifdef OPENVPN_PLATFORM_WIN
|
|
#include <time.h> // for ::time() on Windows
|
|
#include <windows.h> // for GetTickCount
|
|
#else
|
|
#include <sys/time.h> // for ::time() and ::gettimeofday()
|
|
#endif
|
|
|
|
namespace openvpn {
|
|
OPENVPN_SIMPLE_EXCEPTION(get_time_error);
|
|
|
|
template <typename T>
|
|
class TimeType
|
|
{
|
|
public:
|
|
enum { prec=1024 };
|
|
typedef ::time_t base_type;
|
|
typedef T type;
|
|
|
|
class Duration
|
|
{
|
|
friend class TimeType;
|
|
|
|
public:
|
|
static Duration seconds(const T v) { return Duration(v * prec); }
|
|
static Duration binary_ms(const T v) { return Duration(v); }
|
|
static Duration infinite() { return Duration(std::numeric_limits<T>::max()); }
|
|
|
|
static Duration milliseconds(const T v)
|
|
{
|
|
// NOTE: assumes that prec == 1024
|
|
// Also note that this might wrap if v is larger than 1/3 of max size of T
|
|
return Duration(v + (v * T(3) / T(128)));
|
|
}
|
|
|
|
Duration() noexcept : duration_(T(0)) {}
|
|
|
|
bool defined() const { return duration_ != T(0); }
|
|
bool operator!() const { return duration_ == T(0); }
|
|
bool is_infinite() const { return duration_ == std::numeric_limits<T>::max(); }
|
|
bool enabled() const { return defined() && !is_infinite(); }
|
|
void set_infinite() { duration_ = std::numeric_limits<T>::max(); }
|
|
void set_zero() { duration_ = T(0); }
|
|
|
|
Duration operator+(const Duration& d) const
|
|
{
|
|
if (is_infinite() || d.is_infinite())
|
|
return infinite();
|
|
else
|
|
return Duration(duration_ + d.duration_);
|
|
}
|
|
|
|
Duration operator+(const int delta) const
|
|
{
|
|
T duration = duration_;
|
|
if (delta >= 0)
|
|
duration += delta;
|
|
else
|
|
{
|
|
const unsigned int ndelta = -delta;
|
|
if (duration_ >= ndelta)
|
|
duration -= ndelta;
|
|
else
|
|
duration = 0;
|
|
}
|
|
return Duration(duration);
|
|
}
|
|
|
|
Duration operator*(const unsigned int mult) const
|
|
{
|
|
return Duration(duration_ * mult);
|
|
}
|
|
|
|
Duration& operator+=(const Duration& d)
|
|
{
|
|
if (is_infinite() || d.is_infinite())
|
|
set_infinite();
|
|
else
|
|
duration_ += d.duration_;
|
|
return *this;
|
|
}
|
|
|
|
void min(const Duration& d)
|
|
{
|
|
if (d.duration_ < duration_)
|
|
duration_ = d.duration_;
|
|
}
|
|
|
|
void max(const Duration& d)
|
|
{
|
|
if (d.duration_ > duration_)
|
|
duration_ = d.duration_;
|
|
}
|
|
|
|
Duration operator-(const Duration& d) const
|
|
{
|
|
if (d.duration_ >= duration_)
|
|
return Duration(0);
|
|
else if (is_infinite())
|
|
return Duration::infinite();
|
|
else
|
|
return Duration(duration_ - d.duration_);
|
|
}
|
|
|
|
Duration& operator-=(const Duration& d)
|
|
{
|
|
if (d.duration_ >= duration_)
|
|
set_zero();
|
|
else if (!is_infinite())
|
|
duration_ -= d.duration_;
|
|
return *this;
|
|
}
|
|
|
|
T to_seconds() const { return duration_ / prec; }
|
|
T to_binary_ms() const { return duration_; }
|
|
|
|
T to_milliseconds() const
|
|
{
|
|
// NOTE: assumes that prec == 1024
|
|
// Also note that this might wrap if duration_ is larger than 1/3 of max size of T
|
|
return duration_ - (duration_ * T(3) / T(128));
|
|
}
|
|
|
|
double to_double() const
|
|
{
|
|
return double(duration_) / double(prec);
|
|
}
|
|
|
|
T raw() const { return duration_; }
|
|
|
|
# define OPENVPN_DURATION_REL(OP) bool operator OP(const Duration& d) const { return duration_ OP d.duration_; }
|
|
OPENVPN_DURATION_REL(==)
|
|
OPENVPN_DURATION_REL(!=)
|
|
OPENVPN_DURATION_REL(>)
|
|
OPENVPN_DURATION_REL(<)
|
|
OPENVPN_DURATION_REL(>=)
|
|
OPENVPN_DURATION_REL(<=)
|
|
# undef OPENVPN_DURATION_REL
|
|
|
|
private:
|
|
explicit Duration(const T duration) : duration_(duration) {}
|
|
|
|
T duration_;
|
|
};
|
|
|
|
TimeType() noexcept : time_(T(0)) {}
|
|
|
|
static TimeType zero() { return TimeType(T(0)); }
|
|
static TimeType infinite() { return TimeType(std::numeric_limits<T>::max()); }
|
|
|
|
bool is_infinite() const { return time_ == std::numeric_limits<T>::max(); }
|
|
|
|
void reset() { time_ = 0; }
|
|
void set_infinite() { time_ = std::numeric_limits<T>::max(); }
|
|
|
|
bool defined() const { return time_ != 0; }
|
|
bool operator!() const { return time_ == 0; }
|
|
|
|
base_type seconds_since_epoch() const { return base_ + time_ / prec; }
|
|
T fractional_binary_ms() const { return time_ % prec; }
|
|
|
|
static TimeType now() { return TimeType(now_()); }
|
|
|
|
void update() { time_ = now_(); }
|
|
|
|
TimeType operator+(const Duration& d) const
|
|
{
|
|
if (is_infinite() || d.is_infinite())
|
|
return infinite();
|
|
else
|
|
return TimeType(time_ + d.duration_);
|
|
}
|
|
|
|
TimeType& operator+=(const Duration& d)
|
|
{
|
|
if (is_infinite() || d.is_infinite())
|
|
set_infinite();
|
|
else
|
|
time_ += d.duration_;
|
|
return *this;
|
|
}
|
|
|
|
Duration operator-(const TimeType& t) const
|
|
{
|
|
if (t.time_ >= time_)
|
|
return Duration(0);
|
|
else if (is_infinite())
|
|
return Duration::infinite();
|
|
else
|
|
return Duration(time_ - t.time_);
|
|
}
|
|
|
|
void min(const TimeType& t)
|
|
{
|
|
if (t.time_ < time_)
|
|
time_ = t.time_;
|
|
}
|
|
|
|
void max(const TimeType& t)
|
|
{
|
|
if (t.time_ > time_)
|
|
time_ = t.time_;
|
|
}
|
|
|
|
long delta_prec(const TimeType& t) const
|
|
{
|
|
return long(time_) - long(t.time_);
|
|
}
|
|
|
|
long delta(const TimeType& t) const
|
|
{
|
|
return delta_prec(t) / long(prec);
|
|
}
|
|
|
|
double delta_float(const TimeType& t) const
|
|
{
|
|
return (double(time_) - double(t.time_)) / double(prec);
|
|
}
|
|
|
|
std::string delta_str(const TimeType& t) const
|
|
{
|
|
if (!defined())
|
|
return "UNDEF-TIME";
|
|
if (is_infinite())
|
|
return "INF";
|
|
const double df = delta_float(t);
|
|
std::string ret;
|
|
if (df >= 0.0)
|
|
ret += '+';
|
|
ret += openvpn::to_string(df);
|
|
return ret;
|
|
}
|
|
|
|
# define OPENVPN_TIME_REL(OP) bool operator OP(const TimeType& t) const { return time_ OP t.time_; }
|
|
OPENVPN_TIME_REL(==)
|
|
OPENVPN_TIME_REL(!=)
|
|
OPENVPN_TIME_REL(>)
|
|
OPENVPN_TIME_REL(<)
|
|
OPENVPN_TIME_REL(>=)
|
|
OPENVPN_TIME_REL(<=)
|
|
# undef OPENVPN_TIME_REL
|
|
|
|
T raw() const { return time_; }
|
|
|
|
static void reset_base_conditional()
|
|
{
|
|
// on 32-bit systems, reset time base after 30 days
|
|
if (sizeof(T) == 4)
|
|
{
|
|
const base_type newbase = ::time(0);
|
|
if (newbase - base_ >= (60*60*24*30))
|
|
reset_base();
|
|
}
|
|
}
|
|
|
|
static void reset_base()
|
|
{
|
|
base_ = ::time(0);
|
|
#ifdef OPENVPN_PLATFORM_WIN
|
|
#if (_WIN32_WINNT >= 0x0600)
|
|
win_recalibrate((DWORD)::GetTickCount64());
|
|
#else
|
|
win_recalibrate(::GetTickCount());
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
// number of tenths of a microsecond since January 1, 1601.
|
|
static uint64_t win_time()
|
|
{
|
|
// NOTE: assumes that prec == 1024
|
|
return ((11644473600ULL * uint64_t(prec)) + (uint64_t(base_) * uint64_t(prec)) + uint64_t(now_())) * 78125ULL / 8ULL;
|
|
}
|
|
|
|
private:
|
|
explicit TimeType(const T time) : time_(time) {}
|
|
|
|
#ifdef OPENVPN_PLATFORM_WIN
|
|
|
|
static void win_recalibrate(const DWORD gtc)
|
|
{
|
|
gtc_last = gtc;
|
|
gtc_base = ::time(0) - gtc_last/1000;
|
|
}
|
|
|
|
static T now_()
|
|
{
|
|
#if (_WIN32_WINNT >= 0x0600)
|
|
const DWORD gtc = (DWORD)::GetTickCount64();
|
|
#else
|
|
const DWORD gtc = ::GetTickCount();
|
|
#endif
|
|
if (gtc < gtc_last)
|
|
win_recalibrate(gtc);
|
|
const time_t sec = gtc_base + gtc / 1000;
|
|
const unsigned int msec = gtc % 1000;
|
|
return T((sec - base_) * prec + msec * prec / 1000);
|
|
}
|
|
|
|
static DWORD gtc_last;
|
|
static time_t gtc_base;
|
|
|
|
#else
|
|
|
|
static T now_()
|
|
{
|
|
::timeval tv;
|
|
if (::gettimeofday(&tv, nullptr) != 0)
|
|
throw get_time_error();
|
|
return T((tv.tv_sec - base_) * prec + tv.tv_usec * prec / 1000000);
|
|
}
|
|
|
|
#endif
|
|
|
|
static base_type base_;
|
|
T time_;
|
|
};
|
|
|
|
#ifdef OPENVPN_PLATFORM_WIN
|
|
template <typename T> DWORD TimeType<T>::gtc_last;
|
|
template <typename T> time_t TimeType<T>::gtc_base;
|
|
#endif
|
|
|
|
template <typename T> typename TimeType<T>::base_type TimeType<T>::base_;
|
|
|
|
typedef TimeType<oulong> Time;
|
|
|
|
typedef Time* TimePtr;
|
|
|
|
} // namespace openvpn
|
|
|
|
#endif // OPENVPN_TIME_TIME_H
|