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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 <string>
#include <vector>
namespace mongo {
/**
* DNS canonicalization converts a hostname into another potentially more globally useful hostname.
*
* This involves issuing some combination of IP and name lookups.
* This enum controls which canonicalization process a client will perform on a
* hostname it is canonicalizing.
*/
enum class HostnameCanonicalizationMode {
kNone, // Perform no canonicalization at all
kForward, // Perform a DNS lookup on the hostname, follow CNAMEs to find the A record
kForwardAndReverse // Forward resolve to get an IP, then perform reverse lookup on it
};
/**
* Returns zero or more fully qualified hostnames associated with the provided hostname.
*
* May return an empty vector if no FQDNs can be determined, or if the underlying
* implementation returns an error. The returned information is advisory only.
*/
std::vector<std::string> getHostFQDNs(std::string hostName, HostnameCanonicalizationMode mode);
} // namespace mongo
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