feat(ui): Add ability to disable LAN discovery

Fix #4074

src/core/core.cpp

@@ -132,22 +132,28 @@ ToxOptionsPtr initToxOptions(const QByteArray& savedata, const ICoreSettings* s)
 {
     // IPv6 needed for LAN discovery, but can crash some weird routers. On by default, can be
     // disabled in options.
-    bool enableIPv6 = s->getEnableIPv6();
-    bool forceTCP = s->getForceTCP();
+    const bool enableIPv6 = s->getEnableIPv6();
+    const bool forceTCP = s->getForceTCP();
+    // LAN requiring UDP is a toxcore limitation, ideally wouldn't be related
+    const bool enableLanDiscovery = s->getEnableLanDiscovery() && !forceTCP;
     ICoreSettings::ProxyType proxyType = s->getProxyType();
     quint16 proxyPort = s->getProxyPort();
     QString proxyAddr = s->getProxyAddr();
     QByteArray proxyAddrData = proxyAddr.toUtf8();
 
+    if (!enableLanDiscovery) {
+        qWarning() << "Core starting without LAN discovery. Peers can only be found through DHT.";
+    }
     if (enableIPv6) {
         qDebug() << "Core starting with IPv6 enabled";
-    } else {
+    } else if(enableLanDiscovery) {
         qWarning() << "Core starting with IPv6 disabled. LAN discovery may not work properly.";
     }
 
     ToxOptionsPtr toxOptions = ToxOptionsPtr(tox_options_new(NULL));
     tox_options_set_ipv6_enabled(toxOptions.get(), enableIPv6);
     tox_options_set_udp_enabled(toxOptions.get(), !forceTCP);
+    tox_options_set_local_discovery_enabled(toxOptions.get(), enableLanDiscovery);
     tox_options_set_start_port(toxOptions.get(), 0);
     tox_options_set_end_port(toxOptions.get(), 0);
 

src/core/icoresettings.h

@@ -23,6 +23,9 @@ public:
     virtual bool getForceTCP() const = 0;
     virtual void setForceTCP(bool enable) = 0;
 
+    virtual bool getEnableLanDiscovery() const = 0;
+    virtual void setEnableLanDiscovery(bool enable) = 0;
+
     virtual QString getProxyAddr() const = 0;
     virtual void setProxyAddr(const QString& address) = 0;
 
@@ -39,6 +42,7 @@ public:
 
     DECLARE_SIGNAL(enableIPv6Changed, bool enabled);
     DECLARE_SIGNAL(forceTCPChanged, bool enabled);
+    DECLARE_SIGNAL(enableLanDiscoveryChanged, bool enabled);
     DECLARE_SIGNAL(proxyTypeChanged, ICoreSettings::ProxyType type);
     DECLARE_SIGNAL(proxyAddressChanged, const QString& address);
     DECLARE_SIGNAL(proxyPortChanged, quint16 port);

src/persistence/settings.cpp

@@ -192,6 +192,7 @@ void Settings::loadGlobal()
         makeToxPortable = s.value("makeToxPortable", false).toBool();
         enableIPv6 = s.value("enableIPv6", true).toBool();
         forceTCP = s.value("forceTCP", false).toBool();
+        enableLanDiscovery = s.value("enableLanDiscovery", true).toBool();
     }
     s.endGroup();
 
@@ -508,6 +509,7 @@ void Settings::saveGlobal()
         s.setValue("makeToxPortable", makeToxPortable);
         s.setValue("enableIPv6", enableIPv6);
         s.setValue("forceTCP", forceTCP);
+        s.setValue("enableLanDiscovery", enableLanDiscovery);
         s.setValue("dbSyncType", static_cast<int>(dbSyncType));
     }
     s.endGroup();
@@ -1225,6 +1227,22 @@ void Settings::setForceTCP(bool enabled)
     }
 }
 
+bool Settings::getEnableLanDiscovery() const
+{
+    QMutexLocker locker{&bigLock};
+    return enableLanDiscovery;
+}
+
+void Settings::setEnableLanDiscovery(bool enabled)
+{
+    QMutexLocker locker{&bigLock};
+
+    if (enabled != enableLanDiscovery) {
+        enableLanDiscovery = enabled;
+        emit enableLanDiscoveryChanged(enableLanDiscovery);
+    }
+}
+
 QNetworkProxy Settings::getProxy() const
 {
     QNetworkProxy proxy;

src/persistence/settings.h

@@ -281,6 +281,9 @@ public:
     bool getForceTCP() const override;
     void setForceTCP(bool enabled) override;
 
+    bool getEnableLanDiscovery() const override;
+    void setEnableLanDiscovery(bool enabled) override;
+
     QString getProxyAddr() const override;
     void setProxyAddr(const QString& address) override;
 
@@ -294,6 +297,7 @@ public:
 
     SIGNAL_IMPL(Settings, enableIPv6Changed, bool enabled)
     SIGNAL_IMPL(Settings, forceTCPChanged, bool enabled)
+    SIGNAL_IMPL(Settings, enableLanDiscoveryChanged, bool enabled)
     SIGNAL_IMPL(Settings, proxyTypeChanged, ICoreSettings::ProxyType type)
     SIGNAL_IMPL(Settings, proxyAddressChanged, const QString& address)
     SIGNAL_IMPL(Settings, proxyPortChanged, quint16 port)
@@ -583,6 +587,7 @@ private:
     bool groupAlwaysNotify;
 
     bool forceTCP;
+    bool enableLanDiscovery;
 
     ICoreSettings::ProxyType proxyType;
     QString proxyAddr;

src/widget/form/settings/advancedform.cpp

@@ -55,7 +55,10 @@ AdvancedForm::AdvancedForm()
     Settings& s = Settings::getInstance();
     bodyUI->cbEnableIPv6->setChecked(s.getEnableIPv6());
     bodyUI->cbMakeToxPortable->setChecked(Settings::getInstance().getMakeToxPortable());
-    bodyUI->cbEnableUDP->setChecked(!s.getForceTCP());
+    const bool udpEnabled = !s.getForceTCP();
+    bodyUI->cbEnableUDP->setChecked(udpEnabled);
+    bodyUI->cbEnableLanDiscovery->setChecked(s.getEnableLanDiscovery());
+    bodyUI->cbEnableLanDiscovery->setEnabled(udpEnabled);
     bodyUI->proxyAddr->setText(s.getProxyAddr());
     quint16 port = s.getProxyPort();
     if (port > 0)
@@ -172,7 +175,9 @@ void AdvancedForm::on_cbEnableIPv6_stateChanged()
 
 void AdvancedForm::on_cbEnableUDP_stateChanged()
 {
-    Settings::getInstance().setForceTCP(!bodyUI->cbEnableUDP->isChecked());
+    const bool enableUdp = bodyUI->cbEnableUDP->isChecked();
+    Settings::getInstance().setForceTCP(!enableUdp);
+    bodyUI->cbEnableLanDiscovery->setEnabled(enableUdp);
 }
 
 void AdvancedForm::on_proxyAddr_editingFinished()

src/widget/form/settings/advancedsettings.ui

@@ -121,6 +121,20 @@
               </property>
              </widget>
             </item>
+            <item> 
+              <layout class="QVBoxLayout" name="verticalLayout_6">
+               <property name="leftMargin">
+                <number>40</number>
+               </property>
+               <item>
+                <widget class="QCheckBox" name="cbEnableLanDiscovery"> 
+                 <property name="text"> 
+                  <string>Enable LAN discovery</string> 
+                 </property> 
+                </widget> 
+               </item>
+              </layout>
+            </item>
            </layout>
           </item>
           <item>