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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 <array>
#include <cstdint>
#include <exception>
#include <iomanip>
#include <iostream>
#include <stdexcept>
#include <string>
#include <vector>
#include <boost/noncopyable.hpp>
#include "mongo/util/assert_util.h"
#include "mongo/util/duration.h"
namespace mongo {
namespace dns {
/**
* An `SRVHostEntry` object represents the information received from a DNS lookup of an SRV record.
* NOTE: An SRV DNS record has several fields, such as priority and weight. This structure lacks
* those fields at this time. They should be safe to add in the future. The code using this
* structure does not need access to those fields at this time.
*/
struct SRVHostEntry {
std::string host;
std::uint16_t port;
SRVHostEntry(std::string initialHost, const std::uint16_t initialPort)
: host(std::move(initialHost)), port(initialPort) {}
inline auto makeRelopsLens() const {
return std::tie(host, port);
}
inline std::string toString() const {
return std::string{host} + ":" + std::to_string(port);
}
inline friend std::ostream& operator<<(std::ostream& os, const SRVHostEntry& entry) {
return os << entry.host << ':' << entry.port;
}
inline friend bool operator==(const SRVHostEntry& lhs, const SRVHostEntry& rhs) {
return lhs.makeRelopsLens() == rhs.makeRelopsLens();
}
inline friend bool operator!=(const SRVHostEntry& lhs, const SRVHostEntry& rhs) {
return !(lhs == rhs);
}
inline friend bool operator<(const SRVHostEntry& lhs, const SRVHostEntry& rhs) {
return lhs.makeRelopsLens() < rhs.makeRelopsLens();
}
};
/**
* Returns a vector containing SRVHost entries for the specified `service`.
* THROWS: `DBException` with `ErrorCodes::DNSHostNotFound` as the status value if the entry is not
* found and `ErrorCodes::DNSProtocolError` as the status value if the DNS lookup fails, for any
* other reason
*/
std::vector<std::pair<SRVHostEntry, Seconds>> lookupSRVRecords(const std::string& service);
/**
* Returns a group of strings containing text from DNS TXT entries for a specified service.
* THROWS: `DBException` with `ErrorCodes::DNSHostNotFound` as the status value if the entry is not
* found and `ErrorCodes::DNSProtocolError` as the status value if the DNS lookup fails, for any
* other reason
*/
std::vector<std::string> lookupTXTRecords(const std::string& service);
/**
* Returns a group of strings containing text from DNS TXT entries for a specified service.
* If the lookup fails because the record doesn't exist, an empty vector is returned.
* THROWS: `DBException` with `ErrorCodes::DNSProtocolError` as the status value if the DNS lookup
* fails for any other reason.
*/
std::vector<std::string> getTXTRecords(const std::string& service);
/**
* Returns a vector of pairs (string, Seconds), where each pair is: a string containing address
* entries for a specified servie, and the corresponding records time to live for a record.
* Returns a group of strings containing Address entries for a specified service.
* THROWS: `DBException` with `ErrorCodes::DNSHostNotFound` as the status value if the entry is not
* found and `ErrorCodes::DNSProtocolError` as the status value if the DNS lookup fails, for any
* other reason.
* NOTE: This function mostly exists to provide an easy test of the OS DNS APIs in our test driver.
*/
std::vector<std::pair<std::string, Seconds>> lookupARecords(const std::string& service);
} // namespace dns
} // namespace mongo
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