Add port forwarding option for embedded tracker

Closes #17781.
PR #17981.

src/base/bittorrent/sessionimpl.cpp

@@ -80,6 +80,7 @@
 #include "base/logger.h"
 #include "base/net/downloadmanager.h"
 #include "base/net/proxyconfigurationmanager.h"
+#include "base/preferences.h"
 #include "base/profile.h"
 #include "base/torrentfileguard.h"
 #include "base/torrentfilter.h"
@@ -548,8 +549,6 @@ SessionImpl::SessionImpl(QObject *parent)
     if (isExcludedFileNamesEnabled())
         populateExcludedFileNamesRegExpList();
 
-    enableTracker(isTrackerEnabled());
-
     connect(Net::ProxyConfigurationManager::instance()
         , &Net::ProxyConfigurationManager::proxyConfigurationChanged
         , this, &SessionImpl::configureDeferred);
@@ -569,11 +568,14 @@ SessionImpl::SessionImpl(QObject *parent)
 
     m_ioThread->start();
 
+    initMetrics();
+    loadStatistics();
+
     // initialize PortForwarder instance
     new PortForwarderImpl(m_nativeSession);
 
-    initMetrics();
-    loadStatistics();
+    // start embedded tracker
+    enableTracker(isTrackerEnabled());
 
     prepareStartup();
 }
@@ -1980,16 +1982,27 @@ void SessionImpl::configurePeerClasses()
 
 void SessionImpl::enableTracker(const bool enable)
 {
+    const QString profile = u"embeddedTracker"_qs;
+    auto *portForwarder = Net::PortForwarder::instance();
+
     if (enable)
     {
         if (!m_tracker)
             m_tracker = new Tracker(this);
 
         m_tracker->start();
+
+        const auto *pref = Preferences::instance();
+        if (pref->isTrackerPortForwardingEnabled())
+            portForwarder->setPorts(profile, {static_cast<quint16>(pref->getTrackerPort())});
+        else
+            portForwarder->removePorts(profile);
     }
     else
     {
         delete m_tracker;
+
+        portForwarder->removePorts(profile);
     }
 }
 

src/base/bittorrent/tracker.cpp

@@ -203,12 +203,12 @@ Tracker::Tracker(QObject *parent)
 
 bool Tracker::start()
 {
-    const QHostAddress ip = QHostAddress::Any;
     const int port = Preferences::instance()->getTrackerPort();
 
     if (m_server->isListening())
     {
-        if (m_server->serverPort() == port)
+        if (const int oldPort = m_server->serverPort()
+            ; oldPort == port)
         {
             // Already listening on the right port, just return
             return true;
@@ -218,9 +218,9 @@ bool Tracker::start()
         m_server->close();
     }
 
-    // Listen on the predefined port
+    // Listen on port
+    const QHostAddress ip = QHostAddress::Any;
     const bool listenSuccess = m_server->listen(ip, port);
-
     if (listenSuccess)
     {
         LogMsg(tr("Embedded Tracker: Now listening on IP: %1, port: %2")

src/base/preferences.cpp

@@ -1164,6 +1164,16 @@ void Preferences::setTrackerPort(const int port)
     setValue(u"Preferences/Advanced/trackerPort"_qs, port);
 }
 
+bool Preferences::isTrackerPortForwardingEnabled() const
+{
+    return value(u"Preferences/Advanced/trackerPortForwarding"_qs, false);
+}
+
+void Preferences::setTrackerPortForwardingEnabled(const bool enabled)
+{
+    setValue(u"Preferences/Advanced/trackerPortForwarding"_qs, enabled);
+}
+
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
 bool Preferences::isUpdateCheckEnabled() const
 {

src/base/preferences.h

@@ -299,6 +299,8 @@ public:
 #endif
     int getTrackerPort() const;
     void setTrackerPort(int port);
+    bool isTrackerPortForwardingEnabled() const;
+    void setTrackerPortForwardingEnabled(bool enabled);
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
     bool isUpdateCheckEnabled() const;
     void setUpdateCheckEnabled(bool enabled);