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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) 2012-2022 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_COMMON_HOSTLIST_H
#define OPENVPN_COMMON_HOSTLIST_H
#include <string>
#include <sstream>
#include <vector>
#include <algorithm>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/options.hpp>
#include <openvpn/common/hostport.hpp>
#include <openvpn/random/randapi.hpp>
namespace openvpn {
namespace HostList {
struct Host
{
Host()
{
}
Host(const std::string &host_arg, const std::string &port_arg)
: host(host_arg),
port(port_arg)
{
}
bool defined() const
{
return !host.empty();
}
void swap(Host &rhs) noexcept
{
host.swap(rhs.host);
port.swap(rhs.port);
}
void reset()
{
host.clear();
port.clear();
}
std::string to_string() const
{
std::ostringstream os;
if (defined())
os << '[' << host << "]:" << port;
else
os << "UNDEF_HOST";
return os.str();
}
std::string host;
std::string port;
};
class List : public std::vector<Host>
{
public:
List()
{
}
List(const OptionList &opt,
const std::string &directive,
const std::string &default_port)
{
auto hl = opt.get_index_ptr(directive);
if (hl)
{
for (auto &i : *hl)
{
const Option &o = opt[i];
o.touch();
add(o.get(1, 256), o.get_default(2, 16, default_port));
}
}
}
void randomize(RandomAPI &rng)
{
std::shuffle(begin(), end(), rng());
}
std::string to_string() const
{
std::ostringstream os;
for (auto &h : *this)
os << h.to_string() << '\n';
return os.str();
}
private:
void add(const std::string &host,
const std::string &port)
{
const std::string title = "host list";
HostPort::validate_host(host, title);
HostPort::validate_port(port, title);
emplace_back(host, port);
}
};
class Iterator
{
public:
Iterator()
{
reset();
}
void reset()
{
index = -1;
}
template <typename HOST>
bool next(const List &list, HOST &host)
{
if (list.size() > 0)
{
if (++index >= list.size())
index = 0;
const Host &h = list[index];
host.host = h.host;
host.port = h.port;
return true;
}
else
return false;
}
private:
int index;
};
} // namespace HostList
} // namespace openvpn
#endif
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