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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.
*/
#include "mongo/util/net/cidr.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/platform/basic.h"
#ifdef _WIN32
#include <Ws2tcpip.h>
#else
#include <arpa/inet.h>
#include <netinet/in.h>
#endif
using std::begin;
using std::find;
using std::end;
namespace mongo {
namespace {
constexpr std::uint8_t kIPv4Bits = 32;
constexpr std::uint8_t kIPv6Bits = 128;
#ifdef _WIN32
/**
* Windows doesn't declare the second arg as const, but it is.
* Also, it should blindly downcast to void*, but it doesn't.
*/
const char* inet_ntop(INT af, const std::uint8_t* addr, PSTR buf, std::size_t bufsz) {
return ::inet_ntop(af, const_cast<void*>(reinterpret_cast<const void*>(addr)), buf, bufsz);
}
#endif
/**
* `std::stoi()` naturally throws `std::invalid_argument` if str
* isn't numeric at all or `std::out_of_range` if str won't fit in an int.
*
* Extend that to include a check that the string is entirely numeric and throw
* `std::invalid_argument` for that as well
*/
int strict_stoi(const std::string& str, int base = 10) {
std::size_t pos;
auto len = std::stoi(str, &pos, base);
if (pos != str.size()) {
throw std::invalid_argument("Invalid characters encountered parsing: " + str + " at " +
str.substr(pos));
}
return len;
}
template <class T>
T& append(T& s, int family, const std::array<uint8_t, 16> ip, int len) {
char buffer[INET6_ADDRSTRLEN + 1] = {};
if (inet_ntop(family, ip.data(), buffer, sizeof(buffer) - 1)) {
s << buffer << '/' << (int)len;
}
return s;
}
} // namespace
StatusWith<CIDR> CIDR::parse(BSONElement from) noexcept {
if (from.type() != String) {
return {ErrorCodes::UnsupportedFormat, "CIDR range must be a string"};
}
return parse(from.valueStringData());
}
StatusWith<CIDR> CIDR::parse(StringData s) noexcept try {
return CIDR(s);
} catch (const DBException& e) {
return e.toStatus();
}
CIDR::CIDR(StringData s) try {
_ip.fill(0);
auto slash = find(begin(s), end(s), '/');
auto ip = (slash == end(s)) ? s.toString() : s.substr(0, slash - begin(s)).toString();
if (inet_pton(AF_INET, ip.c_str(), _ip.data())) {
_family = AF_INET;
_len = kIPv4Bits;
} else if (inet_pton(AF_INET6, ip.c_str(), _ip.data())) {
_family = AF_INET6;
_len = kIPv6Bits;
} else {
uasserted(ErrorCodes::UnsupportedFormat, "Invalid IP address in CIDR string");
}
if (slash == end(s)) {
return;
}
auto len = strict_stoi(std::string(slash + 1, end(s)), 10);
uassert(ErrorCodes::UnsupportedFormat,
"Invalid length in CIDR string",
(len >= 0) && (len <= _len));
_len = len;
} catch (const std::invalid_argument&) {
uasserted(ErrorCodes::UnsupportedFormat, "Non-numeric length in CIDR string");
} catch (const std::out_of_range&) {
uasserted(ErrorCodes::UnsupportedFormat, "Invalid length in CIDR string");
}
template <>
BSONObjBuilder& BSONObjBuilderValueStream::operator<<<CIDR>(CIDR value) {
_builder->append(_fieldName, value.toString());
_fieldName = StringData();
return *_builder;
}
} // namespace
std::ostream& mongo::operator<<(std::ostream& s, const CIDR& cidr) {
return append(s, cidr._family, cidr._ip, cidr._len);
}
mongo::StringBuilder& mongo::operator<<(StringBuilder& s, const CIDR& cidr) {
return append(s, cidr._family, cidr._ip, cidr._len);
}
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