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
@@ -0,0 +1,68 @@
+//    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/>.
+
+#pragma once
+
+#include <openvpn/addr/route.hpp>
+#include <openvpn/common/exception.hpp>
+#include <openvpn/random/randapi.hpp>
+
+namespace openvpn {
+  namespace IP {
+
+    inline IPv4::Addr random_addr_v4(RandomAPI& prng)
+    {
+      return IPv4::Addr::from_uint32(prng.rand_get<std::uint32_t>());
+    }
+
+    inline IPv6::Addr random_addr_v6(RandomAPI& prng)
+    {
+      unsigned char bytes[16];
+      prng.rand_fill(bytes);
+      return IPv6::Addr::from_byte_string(bytes);
+    }
+
+    inline Addr random_addr(const Addr::Version v, RandomAPI& prng)
+    {
+      switch (v)
+	{
+	case Addr::V4:
+	  return Addr::from_ipv4(random_addr_v4(prng));
+	case Addr::V6:
+	  return Addr::from_ipv6(random_addr_v6(prng));
+	default:
+	  throw ip_exception("address unspecified");
+	}
+    }
+
+    // bit positions between templ.prefix_len and prefix_len are randomized
+    inline Route random_subnet(const Route& templ,
+			       const unsigned int prefix_len,
+			       RandomAPI& prng)
+    {
+      if (!templ.is_canonical())
+	throw Exception("IP::random_subnet: template route not canonical: " + templ.to_string());
+      return Route(((random_addr(templ.addr.version(), prng) & ~templ.netmask()) | templ.addr)
+		   & Addr::netmask_from_prefix_len(templ.addr.version(), prefix_len),
+		   prefix_len);
+    }
+  }
+}