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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 <stdio.h>
static int 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 -1;
}
//! [0]
enum CommandLineParseResult
{
CommandLineOk,
CommandLineError,
CommandLineVersionRequested,
CommandLineHelpRequested
};
CommandLineParseResult parseCommandLine(QCommandLineParser &parser, DnsQuery *query, QString *errorMessage)
{
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())) {
*errorMessage = parser.errorText();
return CommandLineError;
}
if (parser.isSet(versionOption))
return CommandLineVersionRequested;
if (parser.isSet(helpOption))
return CommandLineHelpRequested;
if (parser.isSet(nameServerOption)) {
const QString nameserver = parser.value(nameServerOption);
query->nameServer = QHostAddress(nameserver);
if (query->nameServer.isNull() || query->nameServer.protocol() == QAbstractSocket::UnknownNetworkLayerProtocol) {
*errorMessage = "Bad nameserver address: " + nameserver;
return CommandLineError;
}
}
if (parser.isSet(typeOption)) {
const QString typeParameter = parser.value(typeOption);
const int type = typeFromParameter(typeParameter);
if (type < 0) {
*errorMessage = "Bad record type: " + typeParameter;
return CommandLineError;
}
query->type = static_cast<QDnsLookup::Type>(type);
}
const QStringList positionalArguments = parser.positionalArguments();
if (positionalArguments.isEmpty()) {
*errorMessage = "Argument 'name' missing.";
return CommandLineError;
}
if (positionalArguments.size() > 1) {
*errorMessage = "Several 'name' arguments specified.";
return CommandLineError;
}
query->name = positionalArguments.first();
return CommandLineOk;
}
//! [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)
printf("Error: %i (%s)\n", dns->error(), qPrintable(dns->errorString()));
// CNAME records
const QList<QDnsDomainNameRecord> cnameRecords = dns->canonicalNameRecords();
for (const QDnsDomainNameRecord &record : cnameRecords)
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";
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)
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)
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)
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)
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) + "\"";
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;
QString errorMessage;
switch (parseCommandLine(parser, &query, &errorMessage)) {
case CommandLineOk:
break;
case CommandLineError:
fputs(qPrintable(errorMessage), stderr);
fputs("\n\n", stderr);
fputs(qPrintable(parser.helpText()), stderr);
return 1;
case CommandLineVersionRequested:
printf("%s %s\n", qPrintable(QCoreApplication::applicationName()),
qPrintable(QCoreApplication::applicationVersion()));
return 0;
case CommandLineHelpRequested:
parser.showHelp();
Q_UNREACHABLE();
}
//! [1]
DnsManager manager;
manager.setQuery(query);
QTimer::singleShot(0, &manager, &DnsManager::execute);
return app.exec();
}
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