socket.h

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/*
BSD 3-Clause License
 
Copyright (c) 2022, Stable Cloud Computing, Inc.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 
3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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*/
#ifndef _SCC_NET_SOCKET_H
#define _SCC_NET_SOCKET_H
 
#include <string>
#include <system_error>
#include <chrono>
#include <util/iobase.h>
 
struct sockaddr;
 
namespace scc::net {
 
class SockaddrBase
{
public:
    SockaddrBase() {}
    virtual ~SockaddrBase() {}
    virtual operator const sockaddr*() const { return nullptr; }
    virtual operator sockaddr*() { return nullptr; }
    virtual unsigned len() const { return 0; }
    virtual std::string str() const { return ""; }
    virtual std::string host() const { return ""; }
};
 
class SocketBase
{
    int m_fd;
 
    SocketBase(const SocketBase&) = delete;
    void operator=(const SocketBase&) = delete;
 
protected:
    explicit SocketBase(int fd) : m_fd{fd} {}
    SocketBase(int, int, int);
    void reset(int, int, int);
    void move(SocketBase& other)
    {
        m_fd = other.m_fd;
        other.m_fd = -1;
    }
    void get_sockaddr(sockaddr&);
 
public:
    virtual ~SocketBase();
    SocketBase(SocketBase&& other)
    {
        move(other);
    }
    const SocketBase& operator=(SocketBase&& other)
    {
        close();
        move(other);
        return *this;
    }
 
    int fd() const { return m_fd; }
    operator int() const { return m_fd; }
 
    void reuse_addr(bool r = true);
 
    void reuse_port(bool r = true);
    
    void non_blocking(bool b = true);
    std::error_code error_code();
    void recv_bufsize(unsigned);
    unsigned recv_bufsize();
    void send_bufsize(unsigned);
    unsigned send_bufsize();
    void send_timeout(std::chrono::milliseconds);
    void recv_timeout(std::chrono::milliseconds);
 
    void bind(const SockaddrBase&);
    size_t recv(void* loc, size_t len);
    size_t recv(void* loc, size_t len, std::error_code& e) noexcept;
    size_t send(const void* loc, size_t len);
    size_t send(const void* loc, size_t len, std::error_code& e) noexcept;
    void close();
};
 
class TcpSocket : public SocketBase, public scc::util::Reader, public scc::util::Writer
{
protected:
    explicit TcpSocket(int fd) : SocketBase(fd) { }
    TcpSocket(int domain, int stype, int proto) : SocketBase(domain, stype, proto) { }
    int accept(sockaddr*, int len, std::error_code&) noexcept;
 
public:
 
    virtual void reset() = 0;
 
    void listen(int maxConnections = 10);
 
    void connect(SockaddrBase&);
    void connect(SockaddrBase&, std::error_code&) noexcept;
 
    virtual size_t read(void* loc, size_t len)
    {
        return recv(loc, len);
    }
    virtual size_t write(const void* loc, size_t len)
    {
        return send(loc, len);
    }
 
    void shutdown();
};
 
class UdpSocket : public SocketBase
{
protected:
    UdpSocket(int, int, int);
public:
    virtual void reset() = 0;
    
    size_t recv(void* loc, size_t len, SockaddrBase& s);
    size_t recv(void* loc, size_t len, SockaddrBase& s, std::error_code& e) noexcept;
    size_t send(const void* loc, size_t len, const SockaddrBase& d);
    size_t send(const void* loc, size_t len, const SockaddrBase& d, std::error_code& e) noexcept;
    size_t recv_next();
};
 
}   // namespace
 
std::ostream& operator<<(std::ostream&, const scc::net::SockaddrBase&);
 
#endif