1 files changed, 125 insertions, 0 deletions
diff --git a/meshmc/launcher/launch/steps/LookupServerAddress.cpp b/meshmc/launcher/launch/steps/LookupServerAddress.cpp
new file mode 100644
index 0000000000..f88b8f8812
--- /dev/null
+++ b/meshmc/launcher/launch/steps/LookupServerAddress.cpp
@@ -0,0 +1,125 @@
+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   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, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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, see <https://www.gnu.org/licenses/>.
+ *
+ *  This file incorporates work covered by the following copyright and
+ *  permission notice:
+ *
+ * Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "LookupServerAddress.h"
+
+#include <launch/LaunchTask.h>
+
+LookupServerAddress::LookupServerAddress(LaunchTask* parent)
+	: LaunchStep(parent), m_dnsLookup(new QDnsLookup(this))
+{
+	connect(m_dnsLookup, &QDnsLookup::finished, this,
+			&LookupServerAddress::on_dnsLookupFinished);
+
+	m_dnsLookup->setType(QDnsLookup::SRV);
+}
+
+void LookupServerAddress::setLookupAddress(const QString& lookupAddress)
+{
+	m_lookupAddress = lookupAddress;
+	m_dnsLookup->setName(QString("_minecraft._tcp.%1").arg(lookupAddress));
+}
+
+void LookupServerAddress::setOutputAddressPtr(MinecraftServerTargetPtr output)
+{
+	m_output = std::move(output);
+}
+
+bool LookupServerAddress::abort()
+{
+	m_dnsLookup->abort();
+	emitFailed("Aborted");
+	return true;
+}
+
+void LookupServerAddress::executeTask()
+{
+	m_dnsLookup->lookup();
+}
+
+void LookupServerAddress::on_dnsLookupFinished()
+{
+	if (isFinished()) {
+		// Aborted
+		return;
+	}
+
+	if (m_dnsLookup->error() != QDnsLookup::NoError) {
+		emit logLine(QString("Failed to resolve server address (this is NOT an "
+							 "error!) %1: %2\n")
+						 .arg(m_dnsLookup->name(), m_dnsLookup->errorString()),
+					 MessageLevel::MeshMC);
+		resolve(m_lookupAddress,
+				25565); // Technically the task failed, however, we don't abort
+						// the launch and leave it up to minecraft to fail (or
+						// maybe not) when connecting
+		return;
+	}
+
+	const auto records = m_dnsLookup->serviceRecords();
+	if (records.empty()) {
+		emit logLine(
+			QString("Failed to resolve server address %1: the DNS lookup "
+					"succeeded, but no records were returned.\n")
+				.arg(m_dnsLookup->name()),
+			MessageLevel::Warning);
+		resolve(m_lookupAddress,
+				25565); // Technically the task failed, however, we don't abort
+						// the launch and leave it up to minecraft to fail (or
+						// maybe not) when connecting
+		return;
+	}
+
+	const auto& firstRecord = records.at(0);
+	quint16 port = firstRecord.port();
+
+	emit logLine(QString("Resolved server address %1 to %2 with port %3\n")
+					 .arg(m_dnsLookup->name(), firstRecord.target(),
+						  QString::number(port)),
+				 MessageLevel::MeshMC);
+	resolve(firstRecord.target(), port);
+}
+
+void LookupServerAddress::resolve(const QString& address, quint16 port)
+{
+	m_output->address = address;
+	m_output->port = port;
+
+	emitSucceeded();
+	m_dnsLookup->deleteLater();
+}