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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kNetwork
#include "mongo/platform/basic.h"
#include "mongo/util/net/hostname_canonicalization.h"
#if !defined(_WIN32)
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#endif
#include "mongo/util/log.h"
#include "mongo/util/net/sockaddr.h"
#include "mongo/util/scopeguard.h"
#include "mongo/util/text.h"
namespace mongo {
std::vector<std::string> getHostFQDNs(std::string hostName, HostnameCanonicalizationMode mode) {
#ifndef _WIN32
using shim_char = char;
using shim_addrinfo = struct addrinfo;
shim_addrinfo* info = nullptr;
const auto& shim_getaddrinfo = getaddrinfo;
const auto& shim_freeaddrinfo = [&info] { freeaddrinfo(info); };
const auto& shim_getnameinfo = getnameinfo;
const auto& shim_toNativeString = [](const char* str) { return std::string(str); };
const auto& shim_fromNativeString = [](const std::string& str) { return str; };
#else
using shim_char = wchar_t;
using shim_addrinfo = struct addrinfoW;
shim_addrinfo* info = nullptr;
const auto& shim_getaddrinfo = GetAddrInfoW;
const auto& shim_freeaddrinfo = [&info] { FreeAddrInfoW(info); };
const auto& shim_getnameinfo = GetNameInfoW;
const auto& shim_toNativeString = toWideString;
const auto& shim_fromNativeString = toUtf8String;
#endif
std::vector<std::string> results;
if (hostName.empty())
return results;
if (mode == HostnameCanonicalizationMode::kNone) {
results.emplace_back(std::move(hostName));
return results;
}
shim_addrinfo hints = {};
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = 0;
hints.ai_protocol = 0;
if (mode == HostnameCanonicalizationMode::kForward) {
hints.ai_flags = AI_CANONNAME;
}
int err;
auto nativeHostName = shim_toNativeString(hostName.c_str());
if ((err = shim_getaddrinfo(nativeHostName.c_str(), nullptr, &hints, &info)) != 0) {
LOG(3) << "Failed to obtain address information for hostname " << hostName << ": "
<< getAddrInfoStrError(err);
return results;
}
const auto guard = makeGuard(shim_freeaddrinfo);
if (mode == HostnameCanonicalizationMode::kForward) {
results.emplace_back(shim_fromNativeString(info->ai_canonname));
return results;
}
bool encounteredErrors = false;
std::stringstream getNameInfoErrors;
getNameInfoErrors << "Failed to obtain name info for: [ ";
for (shim_addrinfo* p = info; p; p = p->ai_next) {
shim_char host[NI_MAXHOST] = {};
if ((err = shim_getnameinfo(
p->ai_addr, p->ai_addrlen, host, sizeof(host), nullptr, 0, NI_NAMEREQD)) == 0) {
results.emplace_back(shim_fromNativeString(host));
} else {
if (encounteredErrors) {
getNameInfoErrors << ", ";
}
encounteredErrors = true;
// Format the addrinfo structure we have into a string for reporting
char ip_str[INET6_ADDRSTRLEN];
struct sockaddr* addr = p->ai_addr;
void* sin_addr = nullptr;
if (p->ai_family == AF_INET) {
struct sockaddr_in* addr_in = reinterpret_cast<struct sockaddr_in*>(addr);
sin_addr = reinterpret_cast<void*>(&addr_in->sin_addr);
} else if (p->ai_family == AF_INET6) {
struct sockaddr_in6* addr_in6 = reinterpret_cast<struct sockaddr_in6*>(addr);
sin_addr = reinterpret_cast<void*>(&addr_in6->sin6_addr);
}
getNameInfoErrors << "(";
if (sin_addr) {
invariant(inet_ntop(p->ai_family, sin_addr, ip_str, sizeof(ip_str)) != nullptr);
getNameInfoErrors << ip_str;
} else {
getNameInfoErrors << "Unknown address family: " << p->ai_family;
}
getNameInfoErrors << ", \"" << getAddrInfoStrError(err) << "\")";
}
}
if (encounteredErrors) {
LOG(3) << getNameInfoErrors.str() << " ]";
}
// Deduplicate the results list
std::sort(results.begin(), results.end());
results.erase(std::unique(results.begin(), results.end()), results.end());
// Remove any name that doesn't have a '.', since A records are illegal in TLDs
results.erase(
std::remove_if(results.begin(),
results.end(),
[](const std::string& str) { return str.find('.') == std::string::npos; }),
results.end());
return results;
}
} // namespace mongo
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