mirror of
https://github.com/OpenVPN/openvpn3.git
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67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2022 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include <openvpn/addr/route.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/random/randapi.hpp>
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namespace openvpn::IP {
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inline IPv4::Addr random_addr_v4(RandomAPI &prng)
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{
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return IPv4::Addr::from_uint32(prng.rand_get<std::uint32_t>());
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}
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inline IPv6::Addr random_addr_v6(RandomAPI &prng)
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{
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unsigned char bytes[16];
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prng.rand_fill(bytes);
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return IPv6::Addr::from_byte_string(bytes);
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}
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inline Addr random_addr(const Addr::Version v, RandomAPI &prng)
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{
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switch (v)
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{
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case Addr::V4:
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return Addr::from_ipv4(random_addr_v4(prng));
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case Addr::V6:
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return Addr::from_ipv6(random_addr_v6(prng));
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default:
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OPENVPN_IP_THROW("random_addr: address unspecified");
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}
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}
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// bit positions between templ.prefix_len and prefix_len are randomized
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inline Route random_subnet(const Route &templ,
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const unsigned int prefix_len,
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RandomAPI &prng)
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{
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if (!templ.is_canonical())
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throw Exception("IP::random_subnet: template route not canonical: " + templ.to_string());
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return Route(((random_addr(templ.addr.version(), prng) & ~templ.netmask()) | templ.addr)
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& Addr::netmask_from_prefix_len(templ.addr.version(), prefix_len),
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prefix_len);
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}
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} // namespace openvpn::IP
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