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authorJanrupf <business.janrupf@gmail.com>2021-05-22 16:14:25 +0200
committerJanrupf <business.janrupf@gmail.com>2021-05-22 16:14:25 +0200
commit23a706bbaebcc8ec9126d019a276c158581bdb53 (patch)
tree225f7c5eba5bcacffa8b7a5de2619a5d732c3d96 /api/logic/launch
parentcc6cd0648a0fcda419bb5469d6322ed86d49c03e (diff)
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NOISSUE Resolve minecraft server using DNS SRV
Diffstat (limited to 'api/logic/launch')
-rw-r--r--api/logic/launch/steps/LookupServerAddress.cpp95
-rw-r--r--api/logic/launch/steps/LookupServerAddress.h51
2 files changed, 146 insertions, 0 deletions
diff --git a/api/logic/launch/steps/LookupServerAddress.cpp b/api/logic/launch/steps/LookupServerAddress.cpp
new file mode 100644
index 00000000..c8e2a20c
--- /dev/null
+++ b/api/logic/launch/steps/LookupServerAddress.cpp
@@ -0,0 +1,95 @@
+#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::setPort(quint16 port)
+{
+ m_port = port;
+}
+
+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::MultiMC);
+ resolve(m_lookupAddress, m_port); // 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, m_port); // 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);
+
+ if (firstRecord.port() != m_port && m_port != 0)
+ {
+ emit logLine(
+ QString("DNS record for %1 suggested %2 as server port, but user supplied %3. Using user override,"
+ " but the port may be wrong!\n").arg(m_dnsLookup->name(), QString::number(firstRecord.port()), QString::number(m_port)),
+ MessageLevel::Warning);
+ }
+ else if (m_port == 0)
+ {
+ m_port = firstRecord.port();
+ }
+
+ emit logLine(QString("Resolved server address %1 to %2 with port %3\n").arg(
+ m_dnsLookup->name(), firstRecord.target(), QString::number(m_port)),MessageLevel::MultiMC);
+ resolve(firstRecord.target(), m_port);
+}
+
+void LookupServerAddress::resolve(const QString &address, quint16 port)
+{
+ m_output->address = address;
+ m_output->port = port;
+
+ emitSucceeded();
+ m_dnsLookup->deleteLater();
+}
diff --git a/api/logic/launch/steps/LookupServerAddress.h b/api/logic/launch/steps/LookupServerAddress.h
new file mode 100644
index 00000000..1f70e97b
--- /dev/null
+++ b/api/logic/launch/steps/LookupServerAddress.h
@@ -0,0 +1,51 @@
+/* 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.
+ */
+
+#pragma once
+
+#include <launch/LaunchStep.h>
+#include <QObjectPtr.h>
+#include <QDnsLookup>
+
+#include "minecraft/launch/MinecraftServerTarget.h"
+
+class LookupServerAddress: public LaunchStep {
+Q_OBJECT
+public:
+ explicit LookupServerAddress(LaunchTask *parent);
+ virtual ~LookupServerAddress() {};
+
+ virtual void executeTask();
+ virtual bool abort();
+ virtual bool canAbort() const
+ {
+ return true;
+ }
+
+ void setLookupAddress(const QString &lookupAddress);
+ void setPort(quint16 port);
+ void setOutputAddressPtr(MinecraftServerTargetPtr output);
+
+private slots:
+ void on_dnsLookupFinished();
+
+private:
+ void resolve(const QString &address, quint16 port);
+
+ QDnsLookup *m_dnsLookup;
+ QString m_lookupAddress;
+ quint16 m_port;
+ MinecraftServerTargetPtr m_output;
+};