mirror/openvpn3
0
0
Fork 0
mirror of https://github.com/OpenVPN/openvpn3.git synced 2024-09-20 20:13:05 +02:00
Code

IP Addr library: added random_addr() and random_subnet()

Browse Source 
Signed-off-by: James Yonan <james@openvpn.net>
This commit is contained in:
James Yonan 2018-04-05 17:56:04 -06:00 committed by Lev Stipakov
parent 2c06ac24cd
commit 58cfd26d20
1 changed files with 59 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
openvpn/addr/randaddr.hpp Normal file
View File

@ -0,0 +1,59 @@
// 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 Addr random_addr(const Addr::Version v, RandomAPI& prng)
{
switch (v)
{
case Addr::V4:
return Addr::from_ipv4(IPv4::Addr::from_uint32(prng.rand_get<std::uint32_t>()));
case Addr::V6:
{
unsigned char bytes[16];
prng.rand_fill(bytes);
return Addr::from_ipv6(IPv6::Addr::from_byte_string(bytes));
}
default:
throw ip_exception("address unspecified");
}
}
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);
}
}
}