DHT port can be changed from Web UI

src/eventmanager.cpp

@@ -189,6 +189,10 @@ void EventManager::setGlobalPreferences(QVariantMap m) const {
   // Bittorrent
   if(m.contains("dht"))
     Preferences::setDHTEnabled(m["dht"].toBool());
+  if(m.contains("dhtSameAsBT"))
+    Preferences::setDHTPortSameAsBT(m["dhtSameAsBT"].toBool());
+  if(m.contains("dht_port"))
+    Preferences::setDHTPort(m["dht_port"].toInt());
   if(m.contains("pex"))
     Preferences::setPeXEnabled(m["pex"].toBool());
   qDebug("Pex support: %d", (int)m["pex"].toBool());
@@ -274,6 +278,8 @@ QVariantMap EventManager::getGlobalPreferences() const {
   data["max_uploads_per_torrent"] = Preferences::getMaxUploadsPerTorrent();
   // Bittorrent
   data["dht"] = Preferences::isDHTEnabled();
+  data["dhtSameAsBT"] = Preferences::isDHTPortSameAsBT();
+  data["dht_port"] = Preferences::getDHTPort();
   data["pex"] = Preferences::isPeXEnabled();
   data["lsd"] = Preferences::isLSDEnabled();
   data["encryption"] = Preferences::getEncryptionSetting();

src/preferences.h

@@ -619,11 +619,21 @@ public:
     return settings.value(QString::fromUtf8("Preferences/Bittorrent/sameDHTPortAsBT"), true).toBool();
   }
 
+  static void setDHTPortSameAsBT(bool same) {
+    QSettings settings("qBittorrent", "qBittorrent");
+    settings.setValue(QString::fromUtf8("Preferences/Bittorrent/sameDHTPortAsBT"), same);
+  }
+
   static int getDHTPort() {
     QSettings settings("qBittorrent", "qBittorrent");
     return settings.value(QString::fromUtf8("Preferences/Bittorrent/DHTPort"), 6881).toInt();
   }
 
+  static void setDHTPort(int port) {
+    QSettings settings("qBittorrent", "qBittorrent");
+    settings.setValue(QString::fromUtf8("Preferences/Bittorrent/DHTPort"), port);
+  }
+
   static bool isLSDEnabled() {
     QSettings settings("qBittorrent", "qBittorrent");
     return settings.value(QString::fromUtf8("Preferences/Bittorrent/LSD"), true).toBool();

src/webui/preferences_content.html

@@ -55,6 +55,12 @@
   <td style="vertical-align: bottom; text-align: right;"><input type="checkbox" id="dht_checkbox"/></td><td>_(Enable DHT network (decentralized))</td>
   </tr>
   <tr>
+  <td style="vertical-align: bottom; text-align: right;"><input type="checkbox" id="DHTPortDiffThanBT_checkbox" onclick="updateDHTPortSettings();"/></td><td>_(Use a different port for DHT and Bittorrent)</td>
+  </tr>
+  <tr>
+  <td style="vertical-align: bottom; text-align: right;">_(DHT port:)</td><td><input type="text" id="DHTPort_txt" value="6881"/></td>
+  </tr>
+  <tr>
   <td style="vertical-align: bottom; text-align: right;"><input type="checkbox" id="pex_checkbox"/></td><td>_(Enable Peer Exchange / PeX (requires restart))</td>
   </tr>
   <tr>
@@ -332,6 +338,10 @@
   var dht = 0;
   if($defined($('dht_checkbox').get('checked')) && $('dht_checkbox').get('checked'))
     dht = 1;
+  var dhtSameAsBT = 1;
+  if($defined($('DHTPortDiffThanBT_checkbox').get('checked')) && $('DHTPortDiffThanBT_checkbox').get('checked'))
+    dhtSameAsBT = 0;
+  var dht_port = $("DHTPort_txt").get('value').toInt();
   var pex = 0;
   if($defined($('pex_checkbox').get('checked')) && $('pex_checkbox').get('checked'))
     pex = 1;
@@ -459,6 +469,8 @@
   dict.set('max_uploads_per_torrent', max_uploads_per_torrent);
   // Bittorrent
   dict.set('dht', dht);
+  dict.set('dhtSameAsBT', dhtSameAsBT);
+  dict.set('dht_port', dht_port);
   dict.set('pex', pex);
   dict.set('lsd', lsd);
   dict.set('encryption', $('encryption_select').get('value'));
@@ -636,6 +648,14 @@ updateFilterSettings = function() {
   }
 }
 
+updateDHTPortSettings = function() {
+  if($defined($('DHTPortDiffThanBT_checkbox').get('checked')) && $('DHTPortDiffThanBT_checkbox').get('checked')) {
+    $('DHTPort_txt').removeProperty('disabled');
+  } else {
+    $('DHTPort_txt').set('disabled', 'true');
+  }
+}
+
 updateHTTPProxySettings = function() {
   if($('http_proxy_type_select').get('value') != "none") {
     $('http_proxy_host_text').removeProperty('disabled');
@@ -807,6 +827,14 @@ loadPreferences = function() {
                     } else {
                       $('dht_checkbox').removeProperty('checked');
                     }
+                    var dhtSameAsBT = pref.dhtSameAsBT;
+                    if(dhtSameAsBT) {
+                      $('DHTPortDiffThanBT_checkbox').removeProperty('checked');
+                    } else {
+                      $('DHTPortDiffThanBT_checkbox').set('checked', 'checked');
+                    }
+                    $("DHTPort_txt").set("value", pref.dht_port);
+                    updateDHTPortSettings();
                     var pex = pref.pex; //bool
                     if(pex) {
                       $('pex_checkbox').set('checked', 'checked');