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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
//
// This code implements an OpenSSL BIO object for streams based on the
// MemQ buffer queue object.
#pragma once
#include <cstring> // for std::strlen and others
#include <openssl/err.h>
#include <openssl/bio.h>
#include <openvpn/common/size.hpp>
#include <openvpn/common/numeric_util.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/frame/frame.hpp>
#include <openvpn/frame/memq_stream.hpp>
#include <openvpn/openssl/compat.hpp>
namespace openvpn::bmq_stream {
class MemQ : public MemQStream
{
public:
MemQ()
{
}
long ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret = 1;
switch (cmd)
{
case BIO_CTRL_RESET:
clear();
break;
case BIO_CTRL_EOF:
ret = (long)empty();
break;
case BIO_C_SET_BUF_MEM_EOF_RETURN:
return_eof_on_empty = (num == 0);
break;
case BIO_CTRL_GET_CLOSE:
ret = BIO_get_shutdown(b);
break;
case BIO_CTRL_SET_CLOSE:
BIO_set_shutdown(b, (int)num);
break;
case BIO_CTRL_WPENDING:
ret = 0L;
break;
case BIO_CTRL_PENDING:
ret = (long)pending();
break;
case BIO_CTRL_DUP:
case BIO_CTRL_FLUSH:
ret = 1;
break;
default:
// OPENVPN_LOG("*** MemQ-stream unimplemented ctrl method=" << cmd);
ret = 0;
break;
}
return (ret);
}
bool return_eof_on_empty = false;
};
class bio_memq_internal
{
public:
inline static int memq_method_type = -1;
inline static BIO_METHOD *memq_method = nullptr;
static inline int memq_new(BIO *b)
{
MemQ *bmq = new (std::nothrow) MemQ();
if (!bmq)
return 0;
BIO_set_shutdown(b, 1);
BIO_set_init(b, 1);
BIO_set_data(b, (void *)bmq);
return 1;
}
static inline int memq_free(BIO *b)
{
if (b == nullptr)
return (0);
if (BIO_get_shutdown(b))
{
MemQ *bmq = (MemQ *)(BIO_get_data(b));
if (BIO_get_init(b) && (bmq != nullptr))
{
delete bmq;
BIO_set_data(b, nullptr);
}
}
return 1;
}
static inline int memq_write(BIO *b, const char *in, int len)
{
MemQ *bmq = (MemQ *)(BIO_get_data(b));
if (in)
{
BIO_clear_retry_flags(b);
try
{
if (len)
bmq->write((const unsigned char *)in, (size_t)len);
return len;
}
catch (...)
{
BIOerr(BIO_F_MEM_WRITE, BIO_R_INVALID_ARGUMENT);
return -1;
}
}
else
{
BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER);
return -1;
}
}
static inline int memq_read(BIO *b, char *out, int size)
{
MemQ *bmq = (MemQ *)(BIO_get_data(b));
int ret = -1;
BIO_clear_retry_flags(b);
if (!bmq->empty())
{
try
{
ret = (int)bmq->read((unsigned char *)out, (size_t)size);
}
catch (...)
{
BIOerr(memq_method_type, BIO_R_INVALID_ARGUMENT);
return -1;
}
}
else
{
if (!bmq->return_eof_on_empty)
BIO_set_retry_read(b);
}
return ret;
}
static inline long memq_ctrl(BIO *b, int cmd, long arg1, void *arg2)
{
MemQ *bmq = (MemQ *)(BIO_get_data(b));
return bmq->ctrl(b, cmd, arg1, arg2);
}
static inline int memq_puts(BIO *b, const char *str)
{
int ret = -1;
auto len = std::strlen(str);
if (is_safe_conversion<int>(len))
{
ret = memq_write(b, str, static_cast<int>(len));
}
return ret;
}
static inline void init_static()
{
memq_method_type = BIO_get_new_index();
memq_method = BIO_meth_new(memq_method_type, "stream memory queue");
BIO_meth_set_write(memq_method, memq_write);
BIO_meth_set_read(memq_method, memq_read);
BIO_meth_set_puts(memq_method, memq_puts);
BIO_meth_set_create(memq_method, memq_new);
BIO_meth_set_destroy(memq_method, memq_free);
BIO_meth_set_gets(memq_method, nullptr);
BIO_meth_set_ctrl(memq_method, memq_ctrl);
}
static inline void free_bio_method()
{
BIO_meth_free(memq_method);
memq_method = nullptr;
}
}; // class bio_memq_internal
inline void init_static()
{
bio_memq_internal::init_static();
}
inline BIO_METHOD *BIO_s_memq(void)
{
return (bio_memq_internal::memq_method);
}
inline MemQ *memq_from_bio(BIO *b)
{
if (BIO_method_type(b) == bio_memq_internal::memq_method_type)
return (MemQ *)(BIO_get_data(b));
else
return nullptr;
}
inline const MemQ *const_memq_from_bio(const BIO *b)
{
if (BIO_method_type(b) == bio_memq_internal::memq_method_type)
return (const MemQ *)(BIO_get_data(const_cast<BIO *>(b)));
else
return nullptr;
}
} // namespace openvpn::bmq_stream
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