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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- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#ifndef OPENVPN_SERVER_VPNSERVPOOL_H
#define OPENVPN_SERVER_VPNSERVPOOL_H
#include <memory>
#include <mutex>
#include <sstream>
#include <vector>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/rc.hpp>
#include <openvpn/server/vpnservnetblock.hpp>
#include <openvpn/addr/ip.hpp>
#include <openvpn/addr/route.hpp>
#include <openvpn/addr/pool.hpp>
namespace openvpn::VPNServerPool {
OPENVPN_EXCEPTION(vpn_serv_pool_error);
struct IP46
{
void add_routes(std::vector<IP::Route> &rtvec)
{
if (ip4.defined())
rtvec.emplace_back(ip4, ip4.size());
if (ip6.defined())
rtvec.emplace_back(ip6, ip6.size());
}
std::string to_string() const
{
std::ostringstream os;
os << '[' << ip4 << ' ' << ip6 << ']';
return os.str();
}
bool defined() const
{
return ip4.defined() || ip6.defined();
}
IP::Addr ip4;
IP::Addr ip6;
};
class Pool : public VPNServerNetblock
{
public:
enum Flags
{
IPv4_DEPLETION = (1 << 0),
IPv6_DEPLETION = (1 << 1),
};
Pool(const OptionList &opt)
: VPNServerNetblock(init_snb_from_opt(opt))
{
if (configured(opt, "server"))
{
pool4.add_range(netblock4().clients);
pool6.add_range(netblock6().clients);
}
}
// returns flags
unsigned int acquire(IP46 &addr_pair, const bool request_ipv6)
{
std::lock_guard<std::mutex> lock(mutex);
unsigned int flags = 0;
if (!pool4.acquire_addr(addr_pair.ip4))
flags |= IPv4_DEPLETION;
if (request_ipv6 && netblock6().defined())
{
if (!pool6.acquire_addr(addr_pair.ip6))
flags |= IPv6_DEPLETION;
}
return flags;
}
void release(IP46 &addr_pair)
{
std::lock_guard<std::mutex> lock(mutex);
if (addr_pair.ip4.defined())
pool4.release_addr(addr_pair.ip4);
if (addr_pair.ip6.defined())
pool6.release_addr(addr_pair.ip6);
}
private:
static VPNServerNetblock init_snb_from_opt(const OptionList &opt)
{
if (configured(opt, "server"))
return VPNServerNetblock(opt, "server", false, 0);
if (configured(opt, "ifconfig"))
return VPNServerNetblock(opt, "ifconfig", false, 0);
return VPNServerNetblock();
}
static bool configured(const OptionList &opt,
const std::string &opt_name)
{
return opt.exists(opt_name) || opt.exists(opt_name + "-ipv6");
}
std::mutex mutex;
IP::Pool pool4;
IP::Pool pool6;
};
class IP46AutoRelease : public IP46, public RC<thread_safe_refcount>
{
public:
typedef RCPtr<IP46AutoRelease> Ptr;
IP46AutoRelease(Pool *pool_arg)
: pool(pool_arg)
{
}
~IP46AutoRelease()
{
if (pool)
pool->release(*this);
}
private:
Pool *pool;
};
} // namespace openvpn::VPNServerPool
#endif
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