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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
//
// A 64-bit session ID, used by ProtoContext.
#ifndef OPENVPN_SSL_PSID_H
#define OPENVPN_SSL_PSID_H
#include <string>
#include <cstring>
#include <openvpn/buffer/buffer.hpp>
#include <openvpn/common/hexstr.hpp>
#include <openvpn/common/memneq.hpp>
namespace openvpn {
class ProtoSessionID
{
public:
enum
{
SIZE = 8
};
constexpr ProtoSessionID()
: defined_(false), id_{}
{
}
void reset()
{
defined_ = false;
std::memset(id_, 0, SIZE);
}
template <typename BufType> // so it can take a Buffer or a ConstBuffer
explicit ProtoSessionID(BufType &buf)
{
buf.read(id_, SIZE);
defined_ = true;
}
void randomize(StrongRandomAPI &rng)
{
rng.rand_bytes(id_, SIZE);
defined_ = true;
}
template <typename BufType> // so it can take a Buffer or a ConstBuffer
void read(BufType &buf)
{
buf.read(id_, SIZE);
defined_ = true;
}
void write(Buffer &buf) const
{
buf.write(id_, SIZE);
}
void prepend(Buffer &buf) const
{
buf.prepend(id_, SIZE);
}
// returned buffer is only valid for *this lifetime
const Buffer get_buf() const
{
if (defined_)
{
return PsidBuf(const_cast<Buffer::type>(id_));
}
return Buffer();
}
constexpr bool defined() const
{
return defined_;
}
bool match(const ProtoSessionID &other) const
{
return defined_ && other.defined_ && !crypto::memneq(id_, other.id_, SIZE);
}
std::string str() const
{
return render_hex(id_, SIZE);
}
private:
// access protected ctor to use Buffer w/o memcpy
struct PsidBuf : Buffer
{
// T* data, const size_t offset, const size_t size, const size_t capacity
PsidBuf(typename Buffer::type id)
: Buffer(id, 0, SIZE, SIZE)
{
}
};
bool defined_;
unsigned char id_[SIZE];
};
} // namespace openvpn
#endif // OPENVPN_SSL_PSID_H
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