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);
     }
 }