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// SPDX-License-Identifier: GPL-3.0-only
// SPDX-FileCopyrightText: 2026 Project Tick
// SPDX-FileContributor: Project Tick Team
/*
* ProjT Launcher - Minecraft Launcher
* Copyright (C) 2026 Project Tick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <QtNetwork/qtcpsocket.h>
#include <QDnsLookup>
#include <QHostInfo>
#include <QObject>
#include "McResolver.h"
McResolver::McResolver(QObject* parent, QString domain, int port)
: QObject(parent),
m_constrDomain(domain),
m_constrPort(port)
{}
void McResolver::ping()
{
pingWithDomainSRV(m_constrDomain, m_constrPort);
}
void McResolver::pingWithDomainSRV(QString domain, int port)
{
QDnsLookup* lookup = new QDnsLookup(this);
lookup->setName(QString("_minecraft._tcp.%1").arg(domain));
lookup->setType(QDnsLookup::SRV);
connect(lookup,
&QDnsLookup::finished,
this,
[this, domain, port]()
{
QDnsLookup* lookup = qobject_cast<QDnsLookup*>(sender());
lookup->deleteLater();
if (lookup->error() != QDnsLookup::NoError)
{
qDebug() << QString("Warning: SRV record lookup failed (%1), trying A record lookup")
.arg(lookup->errorString());
pingWithDomainA(domain, port);
return;
}
auto records = lookup->serviceRecords();
if (records.isEmpty())
{
qDebug() << "Warning: no SRV entries found for domain, trying A record lookup";
pingWithDomainA(domain, port);
return;
}
const auto& firstRecord = records.at(0);
QString newDomain = firstRecord.target();
int newPort = firstRecord.port();
pingWithDomainA(newDomain, newPort);
});
lookup->lookup();
}
void McResolver::pingWithDomainA(QString domain, int port)
{
QHostInfo::lookupHost(domain,
this,
[this, port](const QHostInfo& hostInfo)
{
if (hostInfo.error() != QHostInfo::NoError)
{
emitFail("A record lookup failed");
return;
}
auto records = hostInfo.addresses();
if (records.isEmpty())
{
emitFail("No A entries found for domain");
return;
}
const auto& firstRecord = records.at(0);
emitSucceed(firstRecord.toString(), port);
});
}
void McResolver::emitFail(QString error)
{
qDebug() << "DNS resolver error:" << error;
emit failed(error);
emit finished();
}
void McResolver::emitSucceed(QString ip, int port)
{
emit succeeded(ip, port);
emit finished();
}
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