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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/platform/basic.h"
#include "mongo/util/dns_query.h"
#include <array>
#include <cassert>
#include <cstdint>
#include <exception>
#include <iostream>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
#include <boost/noncopyable.hpp>
#include "mongo/bson/util/builder.h"
// It is safe to include the implementation "headers" in an anonymous namespace, as the code is
// meant to live in a single TU -- this one. Include one of these headers last.
#define MONGO_UTIL_DNS_QUERY_PLATFORM_INCLUDE_WHITELIST
#ifdef WIN32
#include "mongo/util/dns_query_windows-impl.h"
#elif defined(__ANDROID__) || defined(__EMSCRIPTEN__)
#include "mongo/util/dns_query_android-impl.h"
#else
#include "mongo/util/dns_query_posix-impl.h"
#endif
#undef MONGO_UTIL_DNS_QUERY_PLATFORM_INCLUDE_WHITELIST
using std::begin;
using std::end;
using namespace std::literals::string_literals;
namespace mongo {
/**
* Returns a string with the IP address or domain name listed...
*/
std::vector<std::string> dns::lookupARecords(const std::string& service) {
DNSQueryState dnsQuery;
auto response = dnsQuery.lookup(service, DNSQueryClass::kInternet, DNSQueryType::kAddress);
std::vector<std::string> rv;
for (const auto& entry : response) {
try {
rv.push_back(entry.addressEntry());
} catch (const ExceptionFor<ErrorCodes::DNSRecordTypeMismatch>&) {
}
}
if (rv.empty()) {
StringBuilder oss;
oss << "Looking up " << service << " A record yielded ";
if (response.size() == 0) {
oss << "no results.";
} else {
oss << "no A records but " << response.size() << " other records";
}
uasserted(ErrorCodes::DNSProtocolError, oss.str());
}
return rv;
}
std::vector<dns::SRVHostEntry> dns::lookupSRVRecords(const std::string& service) {
DNSQueryState dnsQuery;
auto response = dnsQuery.lookup(service, DNSQueryClass::kInternet, DNSQueryType::kSRV);
std::vector<SRVHostEntry> rv;
for (const auto& entry : response) {
try {
rv.push_back(entry.srvHostEntry());
} catch (const ExceptionFor<ErrorCodes::DNSRecordTypeMismatch>&) {
}
}
if (rv.empty()) {
StringBuilder oss;
oss << "Looking up " << service << " SRV record yielded ";
if (response.size() == 0) {
oss << "no results.";
} else {
oss << "no SRV records but " << response.size() << " other records";
}
uasserted(ErrorCodes::DNSProtocolError, oss.str());
}
return rv;
}
std::vector<std::string> dns::lookupTXTRecords(const std::string& service) {
DNSQueryState dnsQuery;
auto response = dnsQuery.lookup(service, DNSQueryClass::kInternet, DNSQueryType::kTXT);
std::vector<std::string> rv;
for (auto& entry : response) {
try {
auto txtEntry = entry.txtEntry();
rv.insert(end(rv),
std::make_move_iterator(begin(txtEntry)),
std::make_move_iterator(end(txtEntry)));
} catch (const ExceptionFor<ErrorCodes::DNSRecordTypeMismatch>&) {
}
}
return rv;
}
std::vector<std::string> dns::getTXTRecords(const std::string& service) try {
return lookupTXTRecords(service);
} catch (const ExceptionFor<ErrorCodes::DNSHostNotFound>&) {
return {};
}
} // namespace mongo
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