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/*
* File: net/modem.hpp
* Purpose: Modem concept in modern C++
* Author: Amlal El Mahrouss (amlal@nekernel.org)
* Copyright 2025, Amlal El Mahrouss, licensed under the Boost Software License.
*/
#pragma once
#include <tests/hpptest.hpp>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <string>
#include <cstddef>
#define OCL_MODEM_INTERFACE : public ocl::net::modem
#ifdef _WIN32
#error !!! "Windows is not supported yet for <modem>" !!!
#endif // _WIN32
namespace ocl::net
{
class modem;
/// =============================================================================
/// @brief Modem container concept, a container to read and write on a network stream.
/// =============================================================================
class modem final
{
public:
using socket_type = int64_t;
using error_type = bool;
using condition_type = bool;
private:
socket_type fd_{};
condition_type is_server_{false};
error_type bad_{true};
public:
const error_type& bad{bad_};
explicit modem() = default;
~modem()
{
this->destroy();
}
modem& operator=(const modem&) = delete;
modem(const modem&) = delete;
static constexpr auto local_address_ip4 = "127.0.0.1";
static constexpr auto local_address_ip6 = "::1";
static constexpr const auto backlog_count = 5U;
/// =============================================================================
/// @brief Check if the modem is valid.
/// @return true if valid, false otherwise.
/// =============================================================================
bool is_valid() const noexcept
{
return this->fd_ != -1 && !this->bad_;
}
template <typename ptr_type>
bool receive(ptr_type& out, std::size_t len) noexcept
{
static_assert(std::is_pointer<ptr_type>::value, "ptr_type is not a pointer!");
if (!out)
return false;
if (!len)
return false;
socket_type cl_{fd_};
if (this->is_server_)
cl_ = ::accept(fd_, nullptr, nullptr);
auto ret = ::recv(cl_, out, len, 0);
return ret > 0L;
}
template <typename ptr_type>
bool transmit(ptr_type& out, std::size_t len) noexcept
{
static_assert(std::is_pointer<ptr_type>::value, "ptr_type is not a pointer!");
if (!out)
return false;
if (!len)
return false;
auto ret = ::send(fd_, out, len, 0);
bad_ = !(ret >= 0L);
return ret >= 0L;
}
template <typename char_type>
bool transmit(const std::basic_string<char_type>& out) noexcept
{
if (out.empty())
return false;
auto ret = ::send(fd_, out.data(), out.size(), 0);
bad_ = !(ret >= 0L);
return ret >= 0L;
}
template <int32_t af, int32_t kind, int32_t port>
bool construct(const char* addr = modem::local_address_ip4, const bool& is_server = false) noexcept
{
static_assert(af != 0, "Address family is zero");
static_assert(kind != 0, "Kind is zero");
must_pass<af == AF_INET || af == AF_INET6>();
must_pass<kind == SOCK_STREAM || kind == SOCK_DGRAM>();
must_pass<(port > 0) && (port < 65536)>();
fd_ = ::socket(af, kind, 0);
is_server_ = is_server;
if (fd_ == -1)
return false;
struct sockaddr_in addr_;
std::memset(&addr_, 0, sizeof(struct sockaddr_in));
addr_.sin_addr.s_addr = ::inet_addr(addr);
addr_.sin_port = htons(port);
addr_.sin_family = af;
if (!is_server)
{
const auto ret = ::connect(fd_, reinterpret_cast<struct sockaddr*>(&addr_), sizeof(addr_));
return ret == 0L;
}
int ret = ::bind(fd_, (struct sockaddr*)&addr_, sizeof(addr_));
bad_ = ret == -1;
::listen(fd_, modem::backlog_count);
return bad_ == false;
}
bool destroy() noexcept
{
if (!fd_)
return false;
::shutdown(fd_, SHUT_RDWR);
::close(fd_);
fd_ = 0L;
return true;
}
};
} // namespace ocl::net
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