/*

This file is part of libhttpserver

Copyright (C) 2011-2019 Sebastiano Merlino

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301

USA

*/

#if !defined (_HTTPSERVER_HPP_INSIDE_) && !defined (HTTPSERVER_COMPILATION)

#error "Only <httpserver.hpp> or <httpserverpp> can be included directly."

#endif

#ifndef SRC_HTTPSERVER_IP_REPRESENTATION_HPP_

#define SRC_HTTPSERVER_IP_REPRESENTATION_HPP_

#include <stdint.h>

#include <algorithm>

#include <bit>

#include <string>

#include <vector>

#include "httpserver/constants.hpp"

#include "httpserver/http_utils.hpp"

// Forward-declared at file scope; the parsing path in src/http_utils.cpp

// pulls in <sys/socket.h> directly so the sockaddr ctor can read the

// address family. Same rationale as http_utils.hpp: backend headers must

// not leak through the umbrella to downstream consumers.

struct sockaddr;

namespace httpserver {

namespace http {

struct ip_representation {

http_utils::IP_version_T ip_version;

// The address as 16 octets, one per element. An IPv6 address fills all

// 16 (each 4-hex-digit group is two octets: high byte then low byte);

// an IPv4 (or IPv4-mapped) address fills octets[12..15] and leaves the

// rest as the mapped prefix. See the parsers in

// src/detail/ip_representation.cpp.

uint8_t octets[16];

// Bitmask over the 16 octets: bit i set means octet i is significant;

// a cleared bit marks a '*' wildcard octet that matches anything.

uint16_t mask;

explicit ip_representation(http_utils::IP_version_T ip_version) :

ip_version(ip_version) {

mask = constants::DEFAULT_MASK_VALUE;

std::fill(octets, octets + 16, 0);

}

explicit ip_representation(const std::string& ip);

explicit ip_representation(const struct sockaddr* ip);

bool operator<(const ip_representation& b) const;

// Number of significant (non-wildcard) octets: the popcount of `mask`,

// which carries one bit per octet.

int weight() const {

return std::popcount(mask);

}

private:

// Helpers carved out of the string-ctor to keep each function under

// the project cyclomatic-complexity bar. parse_ipv6 / parse_ipv4

// do the top-level dispatch; the rest serve parse_ipv6.

void parse_ipv4(const std::string& ip);

void parse_ipv6(const std::string& ip);

static unsigned int compute_ipv6_omitted_segments(std::vector<std::string>& parts);

void apply_ipv6_part(std::vector<std::string>& parts, unsigned int i,

int& y, unsigned int omitted);

void parse_nested_ipv4(const std::vector<std::string>& parts,

unsigned int i, int y);

};

} // namespace http

} // namespace httpserver

#endif // SRC_HTTPSERVER_IP_REPRESENTATION_HPP_