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/*
* File: net/modem.hpp
* Purpose: Modem concept in modern C++
* Author: Amlal El Mahrouss (founder@snu.systems)
* Copyright 2025, Amlal El Mahrouss and SNU Systems Corp.
*/
#ifndef _SNU_NET_NETWORK_HPP
#define _SNU_NET_NETWORK_HPP
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <string>
#include <utility>
#include <cstddef>
#define SNU_MODEM_INTERFACE : protected snu::net::basic_modem
namespace snu::net
{
template <typename char_type>
class basic_modem;
typedef int64_t socket_type;
/// @brief Modem container concept, a container to read and write on a network stream.
template <typename char_type>
class basic_modem
{
socket_type fd_{};
bool server_fd_{};
public:
explicit basic_modem() = default;
virtual ~basic_modem() = default;
basic_modem& operator=(const basic_modem&) = default;
basic_modem(const basic_modem&) = default;
static constexpr auto local_address_ip4 = "127.0.0.1";
static constexpr auto local_address_ip6 = "::1";
static constexpr const auto backlog_count = 5U;
bool is_valid() const noexcept
{
return this->fd_ != -1;
}
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->server_fd_)
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, "char_type is not a pointer!");
if (!out)
return false;
if (!len)
return false;
auto ret = ::send(fd_, out, len, 0);
return ret > 0L;
}
template <typename ptr_type>
bool transmit(std::basic_string<ptr_type> out) noexcept
{
if (out.empty())
return false;
auto ret = ::send(fd_, out.data(), out.size(), 0);
return ret > 0L;
}
template <int32_t af, int32_t kind, int32_t port>
bool construct(const char* addr = basic_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");
fd_ = ::socket(af, kind, 0);
server_fd_ = 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;
}
::bind(fd_, (struct sockaddr*)&addr_, sizeof(addr_));
::listen(fd_, basic_modem::backlog_count);
return true;
}
bool destroy() noexcept
{
if (!fd_)
return false;
::shutdown(fd_, SHUT_RDWR);
::close(fd_);
fd_ = 0L;
return true;
}
};
} // namespace snu::net
#endif // ifndef _SNU_NET_NETWORK_HPP
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