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// Copyright (C) 2016 Jeremy Lainé <jeremy.laine@m4x.org>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "dnslookup.h"
#include <QCoreApplication>
#include <QDnsLookup>
#include <QHostAddress>
#include <QStringList>
#include <QTimer>
#include <QCommandLineParser>
#include <QCommandLineOption>
#include <cstdio>
using namespace Qt::StringLiterals;
static std::optional<QDnsLookup::Type> typeFromParameter(QStringView type)
{
if (type.compare(u"a", Qt::CaseInsensitive) == 0)
return QDnsLookup::A;
if (type.compare(u"aaaa", Qt::CaseInsensitive) == 0)
return QDnsLookup::AAAA;
if (type.compare(u"any", Qt::CaseInsensitive) == 0)
return QDnsLookup::ANY;
if (type.compare(u"cname", Qt::CaseInsensitive) == 0)
return QDnsLookup::CNAME;
if (type.compare(u"mx", Qt::CaseInsensitive) == 0)
return QDnsLookup::MX;
if (type.compare(u"ns", Qt::CaseInsensitive) == 0)
return QDnsLookup::NS;
if (type.compare(u"ptr", Qt::CaseInsensitive) == 0)
return QDnsLookup::PTR;
if (type.compare(u"srv", Qt::CaseInsensitive) == 0)
return QDnsLookup::SRV;
if (type.compare(u"txt", Qt::CaseInsensitive) == 0)
return QDnsLookup::TXT;
return std::nullopt;
}
//! [0]
struct CommandLineParseResult
{
enum class Status {
Ok,
Error,
VersionRequested,
HelpRequested
};
Status statusCode = Status::Ok;
std::optional<QString> errorString = std::nullopt;
};
CommandLineParseResult parseCommandLine(QCommandLineParser &parser, DnsQuery *query)
{
using Status = CommandLineParseResult::Status;
parser.setSingleDashWordOptionMode(QCommandLineParser::ParseAsLongOptions);
const QCommandLineOption nameServerOption("n", "The name server to use.", "nameserver");
parser.addOption(nameServerOption);
const QCommandLineOption typeOption("t", "The lookup type.", "type");
parser.addOption(typeOption);
parser.addPositionalArgument("name", "The name to look up.");
const QCommandLineOption helpOption = parser.addHelpOption();
const QCommandLineOption versionOption = parser.addVersionOption();
if (!parser.parse(QCoreApplication::arguments()))
return { Status::Error, parser.errorText() };
if (parser.isSet(versionOption))
return { Status::VersionRequested };
if (parser.isSet(helpOption))
return { Status::HelpRequested };
if (parser.isSet(nameServerOption)) {
const QString nameserver = parser.value(nameServerOption);
query->nameServer = QHostAddress(nameserver);
if (query->nameServer.isNull()
|| query->nameServer.protocol() == QAbstractSocket::UnknownNetworkLayerProtocol) {
return { Status::Error,
u"Bad nameserver address: %1"_s.arg(nameserver) };
}
}
if (parser.isSet(typeOption)) {
const QString typeParameter = parser.value(typeOption);
if (std::optional<QDnsLookup::Type> type = typeFromParameter(typeParameter))
query->type = *type;
else
return { Status::Error, u"Bad record type: %1"_s.arg(typeParameter) };
}
const QStringList positionalArguments = parser.positionalArguments();
if (positionalArguments.isEmpty())
return { Status::Error, u"Argument 'name' missing."_s };
if (positionalArguments.size() > 1)
return { Status::Error, u"Several 'name' arguments specified."_s };
query->name = positionalArguments.first();
return { Status::Ok };
}
//! [0]
DnsManager::DnsManager()
: dns(new QDnsLookup(this))
{
connect(dns, &QDnsLookup::finished, this, &DnsManager::showResults);
}
void DnsManager::execute()
{
// lookup type
dns->setType(query.type);
if (!query.nameServer.isNull())
dns->setNameserver(query.nameServer);
dns->setName(query.name);
dns->lookup();
}
void DnsManager::showResults()
{
if (dns->error() != QDnsLookup::NoError)
std::printf("Error: %i (%s)\n", dns->error(), qPrintable(dns->errorString()));
// CNAME records
const QList<QDnsDomainNameRecord> cnameRecords = dns->canonicalNameRecords();
for (const QDnsDomainNameRecord &record : cnameRecords) {
std::printf("%s\t%i\tIN\tCNAME\t%s\n", qPrintable(record.name()), record.timeToLive(),
qPrintable(record.value()));
}
// A and AAAA records
const QList<QDnsHostAddressRecord> aRecords = dns->hostAddressRecords();
for (const QDnsHostAddressRecord &record : aRecords) {
const char *type =
(record.value().protocol() == QAbstractSocket::IPv6Protocol) ? "AAAA" : "A";
std::printf("%s\t%i\tIN\t%s\t%s\n", qPrintable(record.name()), record.timeToLive(), type,
qPrintable(record.value().toString()));
}
// MX records
const QList<QDnsMailExchangeRecord> mxRecords = dns->mailExchangeRecords();
for (const QDnsMailExchangeRecord &record : mxRecords) {
std::printf("%s\t%i\tIN\tMX\t%u %s\n", qPrintable(record.name()), record.timeToLive(),
record.preference(), qPrintable(record.exchange()));
}
// NS records
const QList<QDnsDomainNameRecord> nsRecords = dns->nameServerRecords();
for (const QDnsDomainNameRecord &record : nsRecords) {
std::printf("%s\t%i\tIN\tNS\t%s\n", qPrintable(record.name()), record.timeToLive(),
qPrintable(record.value()));
}
// PTR records
const QList<QDnsDomainNameRecord> ptrRecords = dns->pointerRecords();
for (const QDnsDomainNameRecord &record : ptrRecords) {
std::printf("%s\t%i\tIN\tPTR\t%s\n", qPrintable(record.name()), record.timeToLive(),
qPrintable(record.value()));
}
// SRV records
const QList<QDnsServiceRecord> srvRecords = dns->serviceRecords();
for (const QDnsServiceRecord &record : srvRecords) {
std::printf("%s\t%i\tIN\tSRV\t%u %u %u %s\n", qPrintable(record.name()),
record.timeToLive(), record.priority(), record.weight(), record.port(),
qPrintable(record.target()));
}
// TXT records
const QList<QDnsTextRecord> txtRecords = dns->textRecords();
for (const QDnsTextRecord &record : txtRecords) {
QStringList values;
const QList<QByteArray> dnsRecords = record.values();
for (const QByteArray &ba : dnsRecords)
values << "\"" + QString::fromLatin1(ba) + "\"";
std::printf("%s\t%i\tIN\tTXT\t%s\n", qPrintable(record.name()), record.timeToLive(),
qPrintable(values.join(' ')));
}
QCoreApplication::instance()->quit();
}
int main(int argc, char *argv[])
{
QCoreApplication app(argc, argv);
//! [1]
QCoreApplication::setApplicationVersion(QT_VERSION_STR);
QCoreApplication::setApplicationName(QCoreApplication::translate("QDnsLookupExample",
"DNS Lookup Example"));
QCommandLineParser parser;
parser.setApplicationDescription(QCoreApplication::translate("QDnsLookupExample",
"An example demonstrating the "
"class QDnsLookup."));
DnsQuery query;
using Status = CommandLineParseResult::Status;
CommandLineParseResult parseResult = parseCommandLine(parser, &query);
switch (parseResult.statusCode) {
case Status::Ok:
break;
case Status::Error:
std::fputs(qPrintable(parseResult.errorString.value_or(u"Unknown error occurred"_s)),
stderr);
std::fputs("\n\n", stderr);
std::fputs(qPrintable(parser.helpText()), stderr);
return 1;
case Status::VersionRequested:
parser.showVersion();
Q_UNREACHABLE_RETURN(0);
case Status::HelpRequested:
parser.showHelp();
Q_UNREACHABLE_RETURN(0);
}
//! [1]
DnsManager manager;
manager.setQuery(query);
QTimer::singleShot(0, &manager, &DnsManager::execute);
return app.exec();
}
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