luanti/src/network/address.h

// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

#pragma once

#ifdef _WIN32
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#include <sys/socket.h>
#endif

#include <ostream>
#include <cstring>
#include "irrlichttypes.h"
#include "networkexceptions.h"

struct IPv6AddressBytes
{
	u8 bytes[16];
	IPv6AddressBytes() { memset(bytes, 0, 16); }
};

class Address
{
public:
	Address();
	Address(u32 address, u16 port);
	Address(u8 a, u8 b, u8 c, u8 d, u16 port);
	Address(const IPv6AddressBytes *ipv6_bytes, u16 port);

	bool operator==(const Address &address) const;
	bool operator!=(const Address &address) const { return !(*this == address); }

	int getFamily() const { return m_addr_family; }
	bool isValid() const { return m_addr_family != 0; }
	bool isIPv6() const { return m_addr_family == AF_INET6; }
	struct in_addr getAddress() const { return m_address.ipv4; }
	struct in6_addr getAddress6() const { return m_address.ipv6; }
	u16 getPort() const { return m_port; }

	void print(std::ostream &s) const;
	std::string serializeString() const;

	// Is this an address that binds to all interfaces (like INADDR_ANY)?
	bool isAny() const;
	// Is this an address referring to the local host?
	bool isLocalhost() const;

	// `name`: hostname or numeric IP
	// `fallback`: fallback IP to try gets written here
	// any empty name resets the IP to the "any address"
	// may throw ResolveError (address is unchanged in this case)
	void Resolve(const char *name, Address *fallback = nullptr);

	void setAddress(u32 address);
	void setAddress(u8 a, u8 b, u8 c, u8 d);
	void setAddress(const IPv6AddressBytes *ipv6_bytes);
	void setPort(u16 port);

private:
	unsigned short m_addr_family = 0;
	union
	{
		struct in_addr ipv4;
		struct in6_addr ipv6;
	} m_address;
	// port is separate from in_addr structures
	u16 m_port = 0;
};