qt5base-lts/examples/network/dnslookup/dnslookup.cpp
Jeremy Lainé e54dc7c2b5 Add support for DNS lookups using native APIs
The QDnsLookup class provides asynchronous APIs for performing
DNS lookups. For now, the following lookups are supported:
- A and AAAA
- CNAME as defined per RFC 1035
- MX as defined per RFC 1035
- NS as defined per RFC 1035
- PTR as defined per RFC 1035
- SRV as defined per RFC 2782
- TXT as defined per RFC 1035

Task-number: QTBUG-10481
Change-Id: I46c1741ec23615863eeca3a1231d5e3f8942495e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
2012-01-30 16:39:46 +01:00

156 lines
5.8 KiB
C++

/****************************************************************************
**
** Copyright (C) 2012 Jeremy Lainé <jeremy.laine@m4x.org>
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "dnslookup.h"
#include <QCoreApplication>
#include <QDnsLookup>
#include <QHostAddress>
#include <QStringList>
#include <QTimer>
#include <stdio.h>
static void usage() {
printf("Qt DNS example - performs DNS lookups\n"
"Usage: dnslookup [-t <type>] name\n\n");
}
DnsManager::DnsManager()
{
dns = new QDnsLookup(this);
connect(dns, SIGNAL(finished()), this, SLOT(showResults()));
}
void DnsManager::execute()
{
QStringList args = QCoreApplication::instance()->arguments();
args.takeFirst();
// lookup type
dns->setType(QDnsLookup::A);
if (args.size() > 1 && args.first() == "-t") {
args.takeFirst();
const QString type = args.takeFirst().toLower();
if (type == "a")
dns->setType(QDnsLookup::A);
else if (type == "aaaa")
dns->setType(QDnsLookup::AAAA);
else if (type == "any")
dns->setType(QDnsLookup::ANY);
else if (type == "cname")
dns->setType(QDnsLookup::CNAME);
else if (type == "mx")
dns->setType(QDnsLookup::MX);
else if (type == "ns")
dns->setType(QDnsLookup::NS);
else if (type == "ptr")
dns->setType(QDnsLookup::PTR);
else if (type == "srv")
dns->setType(QDnsLookup::SRV);
else if (type == "txt")
dns->setType(QDnsLookup::TXT);
else {
printf("Bad record type: %s\n", qPrintable(type));
QCoreApplication::instance()->quit();
return;
}
}
if (args.isEmpty()) {
usage();
QCoreApplication::instance()->quit();
return;
}
dns->setName(args.takeFirst());
dns->lookup();
}
void DnsManager::showResults()
{
if (dns->error() != QDnsLookup::NoError)
printf("Error: %i (%s)\n", dns->error(), qPrintable(dns->errorString()));
// CNAME records
foreach (const QDnsDomainNameRecord &record, dns->canonicalNameRecords())
printf("%s\t%i\tIN\tCNAME\t%s\n", qPrintable(record.name()), record.timeToLive(), qPrintable(record.value()));
// A and AAAA records
foreach (const QDnsHostAddressRecord &record, dns->hostAddressRecords()) {
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
foreach (const QDnsMailExchangeRecord &record, dns->mailExchangeRecords())
printf("%s\t%i\tIN\tMX\t%u %s\n", qPrintable(record.name()), record.timeToLive(), record.preference(), qPrintable(record.exchange()));
// NS records
foreach (const QDnsDomainNameRecord &record, dns->nameServerRecords())
printf("%s\t%i\tIN\tNS\t%s\n", qPrintable(record.name()), record.timeToLive(), qPrintable(record.value()));
// PTR records
foreach (const QDnsDomainNameRecord &record, dns->pointerRecords())
printf("%s\t%i\tIN\tPTR\t%s\n", qPrintable(record.name()), record.timeToLive(), qPrintable(record.value()));
// SRV records
foreach (const QDnsServiceRecord &record, dns->serviceRecords())
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
foreach (const QDnsTextRecord &record, dns->textRecords()) {
QStringList values;
foreach (const QByteArray &ba, record.values())
values << "\"" + QString::fromAscii(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);
DnsManager manager;
QTimer::singleShot(0, &manager, SLOT(execute()));
return app.exec();
}