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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/base/status_with.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonmisc.h"
#include <stdexcept>
#include <string>
#ifndef _WIN32
#include <sys/socket.h>
#endif
namespace mongo {
/**
* CIDR (Classless Inter-Domain Routing)
*/
class CIDR {
public:
explicit CIDR(StringData);
/**
* If the given BSONElement represents a valid CIDR range,
* constructs and returns the CIDR.
* Otherwise returns an error.
*/
static StatusWith<CIDR> parse(BSONElement from) noexcept;
/**
* If the given string represents a valid CIDR range,
* constructs and returns the CIDR.
* Otherwise returns an error.
*/
static StatusWith<CIDR> parse(StringData from) noexcept;
/**
* Returns true if the provided address range is contained
* entirely within this one, false otherwise.
*/
bool contains(const CIDR& cidr) const {
if ((_family != cidr._family) || (_len > cidr._len)) {
return false;
}
auto bytes = _len / 8;
auto const range = _ip.begin();
auto const ip = cidr._ip.begin();
if (!std::equal(range, range + bytes, ip, ip + bytes)) {
return false;
}
if ((_len % 8) == 0) {
return true;
}
auto mask = (0xFF << (8 - (_len % 8))) & 0xFF;
return (_ip[bytes] & mask) == (cidr._ip[bytes] & mask);
}
friend bool operator==(const CIDR& lhs, const CIDR& rhs);
friend bool operator!=(const CIDR& lhs, const CIDR& rhs) {
return !(lhs == rhs);
}
friend std::ostream& operator<<(std::ostream& s, const CIDR& rhs);
friend StringBuilder& operator<<(StringBuilder& s, const CIDR& rhs);
/**
* Return a string representation of this CIDR (i.e. "169.254.0.0/16")
*/
std::string toString() const {
StringBuilder s;
s << *this;
return s.str();
}
private:
#ifdef _WIN32
using sa_family_t = int;
#endif
auto equalityLens() const {
return std::tie(_ip, _family, _len);
}
std::array<std::uint8_t, 16> _ip;
sa_family_t _family;
std::uint8_t _len;
};
inline bool operator==(const CIDR& lhs, const CIDR& rhs) {
return lhs.equalityLens() == rhs.equalityLens();
}
std::ostream& operator<<(std::ostream& s, const CIDR& cidr);
StringBuilder& operator<<(StringBuilder& s, const CIDR& cidr);
/**
* Supports use of CIDR with the BSON macro:
* BSON("cidr" << cidr) -> { cidr: "..." }
*/
template <>
BSONObjBuilder& BSONObjBuilderValueStream::operator<<<CIDR>(CIDR value);
} // namespace mongo
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