Made changes for clean up and fix the problem that a new ramdon port is set every time a setting is saved.

src/preferences/options.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>789</width>
+    <width>779</width>
     <height>591</height>
    </rect>
   </property>
@@ -177,8 +177,8 @@
             <rect>
              <x>0</x>
              <y>-161</y>
-             <width>486</width>
-             <height>638</height>
+             <width>484</width>
+             <height>693</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_9">
@@ -262,6 +262,16 @@
                  </property>
                 </widget>
                </item>
+               <item>
+                <widget class="QCheckBox" name="checkRandomPort">
+                 <property name="text">
+                  <string>Use random port to communicate</string>
+                 </property>
+                 <property name="checked">
+                  <bool>false</bool>
+                 </property>
+                </widget>
+               </item>
                <item>
                 <widget class="QGroupBox" name="groupBox_7">
                  <property name="font">
@@ -516,8 +526,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>482</width>
-             <height>1025</height>
+             <width>501</width>
+             <height>930</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout">
@@ -735,6 +745,15 @@
                       <attribute name="verticalHeaderVisible">
                        <bool>false</bool>
                       </attribute>
+                      <attribute name="horizontalHeaderShowSortIndicator" stdset="0">
+                       <bool>false</bool>
+                      </attribute>
+                      <attribute name="horizontalHeaderStretchLastSection">
+                       <bool>true</bool>
+                      </attribute>
+                      <attribute name="horizontalHeaderDefaultSectionSize">
+                       <number>80</number>
+                      </attribute>
                      </widget>
                     </item>
                     <item>
@@ -1022,8 +1041,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>474</width>
-             <height>577</height>
+             <width>451</width>
+             <height>524</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_20">
@@ -1466,8 +1485,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>359</width>
-             <height>480</height>
+             <width>398</width>
+             <height>458</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_33">
@@ -1741,6 +1760,12 @@
                     </item>
                     <item>
                      <widget class="QTimeEdit" name="schedule_from">
+                      <property name="displayFormat">
+                       <string notr="true">hh:mm</string>
+                      </property>
+                      <property name="calendarPopup">
+                       <bool>false</bool>
+                      </property>
                       <property name="time">
                        <time>
                         <hour>8</hour>
@@ -1748,12 +1773,6 @@
                         <second>0</second>
                        </time>
                       </property>
-                      <property name="displayFormat">
-                       <string notr="true">hh:mm</string>
-                      </property>
-                      <property name="calendarPopup">
-                       <bool>false</bool>
-                      </property>
                      </widget>
                     </item>
                     <item>
@@ -1768,6 +1787,9 @@
                     </item>
                     <item>
                      <widget class="QTimeEdit" name="schedule_to">
+                      <property name="displayFormat">
+                       <string notr="true">hh:mm</string>
+                      </property>
                       <property name="time">
                        <time>
                         <hour>20</hour>
@@ -1775,9 +1797,6 @@
                         <second>0</second>
                        </time>
                       </property>
-                      <property name="displayFormat">
-                       <string notr="true">hh:mm</string>
-                      </property>
                      </widget>
                     </item>
                     <item>
@@ -1878,8 +1897,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>557</width>
-             <height>555</height>
+             <width>546</width>
+             <height>524</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_7">
@@ -2292,8 +2311,8 @@
             <rect>
              <x>0</x>
              <y>0</y>
-             <width>426</width>
-             <height>611</height>
+             <width>436</width>
+             <height>553</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_23">

src/preferences/options_imp.cpp

@@ -138,6 +138,8 @@ options_imp::options_imp(QWidget *parent):
   // General tab
   connect(comboI18n, SIGNAL(currentIndexChanged(int)), this, SLOT(enableApplyButton()));
   connect(checkAltRowColors, SIGNAL(toggled(bool)), this, SLOT(enableApplyButton()));
+  //add checkbox for random port
+  connect(checkRandomPort, SIGNAL(toggled(bool)), this, SLOT(enableApplyButton()));
   connect(checkShowSystray, SIGNAL(toggled(bool)), this, SLOT(enableApplyButton()));
   connect(checkCloseToSystray, SIGNAL(toggled(bool)), this, SLOT(enableApplyButton()));
   connect(checkMinimizeToSysTray, SIGNAL(toggled(bool)), this, SLOT(enableApplyButton()));
@@ -367,6 +369,8 @@ void options_imp::saveOptions() {
   // General preferences
   pref.setLocale(locale);
   pref.setAlternatingRowColors(checkAltRowColors->isChecked());
+  //set random port
+  pref.setRandomPort(checkRandomPort->isChecked());
   pref.setSystrayIntegration(systrayIntegration());
   pref.setTrayIconStyle(TrayIcon::Style(comboTrayIcon->currentIndex()));
   pref.setCloseToTray(closeToTray());
@@ -540,6 +544,8 @@ void options_imp::loadOptions() {
   const Preferences pref;
   setLocale(pref.getLocale());
   checkAltRowColors->setChecked(pref.useAlternatingRowColors());
+  //get random port
+  checkRandomPort->setChecked(pref.useRandomPort());
   checkShowSystray->setChecked(pref.systrayIntegration());
   checkShowSplash->setChecked(!pref.isSlashScreenDisabled());
   if (checkShowSystray->isChecked()) {
@@ -792,6 +798,7 @@ void options_imp::on_randomButton_clicked() {
   spinPort->setValue(rand() % 64512 + 1024);
 }
 
+
 int options_imp::getEncryptionSetting() const {
   return comboEncryption->currentIndex();
 }

src/preferences/preferences.h

@@ -78,6 +78,7 @@ public:
   }
 
   // General options
+  
   QString getLocale() const {
     return value(QString::fromUtf8("Preferences/General/Locale"), "en_GB").toString();
   }
@@ -126,6 +127,14 @@ public:
     setValue("Preferences/General/AlternatingRowColors", b);
   }
 
+  bool useRandomPort() const {
+    return value(QString::fromUtf8("Preferences/General/RandomPort"), true).toBool();
+  }
+
+  void setRandomPort(bool b) {
+    setValue("Preferences/General/RandomPort", b);
+  }
+
   bool systrayIntegration() const {
 #ifdef Q_WS_MAC
     return false;

src/qtlibtorrent/qbtsession.cpp

@@ -115,6 +115,7 @@ QBtSession::QBtSession()
   , m_tracker(0), m_shutdownAct(NO_SHUTDOWN),
     m_upnp(0), m_natpmp(0), m_dynDNSUpdater(0)
 {
+  setRandomPortset(false);
   BigRatioTimer = new QTimer(this);
   BigRatioTimer->setInterval(10000);
   connect(BigRatioTimer, SIGNAL(timeout()), SLOT(processBigRatios()));
@@ -281,17 +282,32 @@ void QBtSession::setQueueingEnabled(bool enable) {
   }
 }
 
+void QBtSession::setRandomPortset(bool set) {
+        randomPortSet = set;
+}
+
 // Set BT session configuration
 void QBtSession::configureSession() {
   qDebug("Configuring session");
-  const Preferences pref;
-  // * Ports binding
+  //removed the constant modifier for Preferences
+  Preferences pref;
   const unsigned short old_listenPort = getListenPort();
   const unsigned short new_listenPort = pref.getSessionPort();
-  if (old_listenPort != new_listenPort) {
-    qDebug("Session port changes in program preferences: %d -> %d", old_listenPort, new_listenPort);
-    setListeningPort(new_listenPort);
+  if(pref.useRandomPort() && !isRandomPortset()) { // to check if the randomPort checkbox is selected
+    setRandomPortset(true);
+    srand(time(0));
+    const unsigned short randomPort = rand() % USHRT_MAX + 1025;
+    setListeningPort(randomPort);
     addConsoleMessage(tr("qBittorrent is bound to port: TCP/%1", "e.g: qBittorrent is bound to port: 6881").arg(QString::number(getListenPort())));
+    pref.setSessionPort(randomPort);
+  } else {
+      // * Ports binding
+
+      if (old_listenPort != new_listenPort) {
+        qDebug("Session port changes in program preferences: %d -> %d", old_listenPort, new_listenPort);
+        setListeningPort(new_listenPort);
+        addConsoleMessage(tr("qBittorrent is bound to port: TCP/%1", "e.g: qBittorrent is bound to port: 6881").arg(QString::number(getListenPort())));
+      }
   }
 
   // Downloads
@@ -1519,7 +1535,7 @@ void QBtSession::loadSessionState() {
   // bdecode
   lazy_entry e;
 #if LIBTORRENT_VERSION_NUM >= 001600
-  libtorrent::error_code ec;
+  error_code ec;
   lazy_bdecode(&in[0], &in[0] + in.size(), e, ec);
   if (!ec) {
 #else
@@ -1903,7 +1919,7 @@ void QBtSession::setListeningPort(int port) {
   Preferences pref;
   std::pair<int,int> ports(port, port);
 #if LIBTORRENT_VERSION_NUM >= 001600
-  libtorrent::error_code ec;
+  error_code ec;
 #endif
   const QString iface_name = pref.getNetworkInterface();
   if (iface_name.isEmpty()) {

src/qtlibtorrent/qbtsession.h

@@ -107,6 +107,8 @@ public:
   inline bool isLSDEnabled() const { return LSDEnabled; }
   inline bool isPexEnabled() const { return PeXEnabled; }
   inline bool isQueueingEnabled() const { return queueingEnabled; }
+  bool isRandomPortset() { return randomPortSet; };
+  void setRandomPortset(bool set);
 
 public slots:
   QTorrentHandle addTorrent(QString path, bool fromScanDir = false, QString from_url = QString(), bool resumed = false);
@@ -257,6 +259,7 @@ private:
   bool m_torrentExportEnabled;
   bool m_finishedTorrentExportEnabled;
   bool appendqBExtension;
+  bool randomPortSet;
   QString defaultSavePath;
   QString defaultTempPath;
   // IP filtering