Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
655 changed files with 146468 additions and 0 deletions
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+//    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/>.
+
+#ifndef OPENVPN_TIME_DURHELPER_H
+#define OPENVPN_TIME_DURHELPER_H
+
+#include <openvpn/common/options.hpp>
+#include <openvpn/time/time.hpp>
+#include <openvpn/random/randapi.hpp>
+
+namespace openvpn {
+  inline void set_duration_parm(Time::Duration& dur,
+				const std::string& name,
+				const std::string& valstr,
+				const unsigned int min_value,
+				const bool x2, // multiply result by 2
+				const bool ms) // values are in milliseconds rather than seconds
+  {
+    const unsigned int maxdur = ms ? 1000*60*60*24 : 60*60*24*7; // maximum duration -- milliseconds: 1 day, seconds: 7 days
+    unsigned int value = 0;
+    const bool status = parse_number<unsigned int>(valstr, value);
+    if (!status)
+      OPENVPN_THROW(option_error, name << ": error parsing number of " << (ms ? "milliseconds" : "seconds"));
+    if (x2)
+      value *= 2;
+    if (value == 0 || value > maxdur)
+      value = maxdur;
+    if (value < min_value)
+      value = min_value;
+    dur = ms ? Time::Duration::milliseconds(value) : Time::Duration::seconds(value);
+  }
+
+  inline const Option* load_duration_parm(Time::Duration& dur,
+					  const std::string& name,
+					  const OptionList& opt,
+					  const unsigned int min_value,
+					  const bool x2,
+					  const bool allow_ms)
+  {
+    // look for milliseconds given as <name>-ms
+    if (allow_ms)
+      {
+	const Option *o = opt.get_ptr(name + "-ms");
+	if (o)
+	  {
+	    set_duration_parm(dur, name, o->get(1, 16), min_value, x2, true);
+	    return o;
+	  }
+      }
+
+    // look for seconds given as <name>
+    {
+      const Option *o = opt.get_ptr(name);
+      if (o)
+	set_duration_parm(dur, name, o->get(1, 16), allow_ms ? 1 : min_value, x2, false);
+      return o;
+    }
+  }
+
+  inline Time::Duration load_duration_default(const std::string& name,
+					      const OptionList& opt,
+					      const Time::Duration& default_duration,
+					      const unsigned int min_value,
+					      const bool x2,
+					      const bool allow_ms)
+  {
+    Time::Duration ret(default_duration);
+    load_duration_parm(ret, name, opt, min_value, x2, allow_ms);
+    return ret;
+  }
+
+  inline Time::Duration skew_duration(const Time::Duration& dur,
+				      const Time::Duration& min,
+				      const unsigned int flux_order,
+				      RandomAPI& rng)
+  {
+    const unsigned int range = 1 << flux_order;
+    const int delta = int(rng.rand_get<unsigned int>() & (range-1)) - int(range>>1);
+    const Time::Duration ret = dur + delta;
+    if (ret >= min)
+      return ret;
+    else
+      return min;
+  }
+}
+
+#endif