The user can force listening on a particular network interface

Changelog

@@ -2,6 +2,7 @@
     - FEATURE: Simplified torrent root folder renaming/truncating (< v2.3.0 is no longer forward compatible)
     - FEATURE: Max number of half-open connections can now be edited
     - FEATURE: Added support for strict super seeding
+    - FEATURE: The user can force listening on a particular network interface
     - COSMETIC: Display peers country name in tooltip
 
 * Sun Mar 14 2010 - Christophe Dumez <chris@qbittorrent.org> - v2.2.0

src/advancedsettings.h

@@ -5,11 +5,13 @@
 #include <QHeaderView>
 #include <QSpinBox>
 #include <QCheckBox>
+#include <QComboBox>
+#include <QNetworkInterface>
 #include "preferences.h"
 
 enum AdvSettingsCols {PROPERTY, VALUE};
-enum AdvSettingsRows {DISK_CACHE, OUTGOING_PORT_MIN, OUTGOING_PORT_MAX, IGNORE_LIMIT_LAN, COUNT_OVERHEAD, RECHECK_COMPLETED, LIST_REFRESH, RESOLVE_COUNTRIES, RESOLVE_HOSTS, MAX_HALF_OPEN, SUPER_SEEDING };
-#define ROW_COUNT 11
+enum AdvSettingsRows {DISK_CACHE, OUTGOING_PORT_MIN, OUTGOING_PORT_MAX, IGNORE_LIMIT_LAN, COUNT_OVERHEAD, RECHECK_COMPLETED, LIST_REFRESH, RESOLVE_COUNTRIES, RESOLVE_HOSTS, MAX_HALF_OPEN, SUPER_SEEDING, NETWORK_IFACE };
+#define ROW_COUNT 12
 
 class AdvancedSettings: public QTableWidget {
   Q_OBJECT
@@ -17,6 +19,7 @@ class AdvancedSettings: public QTableWidget {
 private:
   QSpinBox *spin_cache, *outgoing_ports_min, *outgoing_ports_max, *spin_list_refresh, *spin_maxhalfopen;
   QCheckBox *cb_ignore_limits_lan, *cb_count_overhead, *cb_recheck_completed, *cb_resolve_countries, *cb_resolve_hosts, *cb_super_seeding;
+  QComboBox *combo_iface;
 
 public:
   AdvancedSettings(QWidget *parent=0): QTableWidget(parent) {
@@ -47,6 +50,7 @@ public:
     delete cb_resolve_hosts;
     delete spin_maxhalfopen;
     delete cb_super_seeding;
+    delete combo_iface;
   }
 
 public slots:
@@ -73,6 +77,13 @@ public slots:
     // Super seeding
     Preferences::enableSuperSeeding(cb_super_seeding->isChecked());
 #endif
+    // Network interface
+    if(combo_iface->currentIndex() == 0) {
+      // All interfaces (default)
+      Preferences::setNetworkInterface(QString::null);
+    } else {
+      Preferences::setNetworkInterface(combo_iface->currentText());
+    }
   }
 
 protected slots:
@@ -159,6 +170,21 @@ protected slots:
     cb_super_seeding->setEnabled(false);
 #endif
     setCellWidget(SUPER_SEEDING, VALUE, cb_super_seeding);
+    // Network interface
+    setItem(NETWORK_IFACE, PROPERTY, new QTableWidgetItem(tr("Network Interface (requires restart)")));
+    combo_iface = new QComboBox;
+    combo_iface->addItem(tr("Any interface", "i.e. Any network interface"));
+    const QString &current_iface = Preferences::getNetworkInterface();
+    int i = 1;
+    foreach(const QNetworkInterface& iface, QNetworkInterface::allInterfaces()) {
+      if(iface.name() == "lo") continue;
+      combo_iface->addItem(iface.name());
+      if(!current_iface.isEmpty() && iface.name() == current_iface)
+        combo_iface->setCurrentIndex(i);
+      ++i;
+    }
+    connect(combo_iface, SIGNAL(currentIndexChanged(int)), this, SLOT(emitSettingsChanged()));
+    setCellWidget(NETWORK_IFACE, VALUE, combo_iface);
   }
 
   void emitSettingsChanged() {

src/bittorrent.cpp

@@ -32,6 +32,9 @@
 #include <QDateTime>
 #include <QString>
 #include <QSettings>
+#include <QNetworkInterface>
+#include <QHostAddress>
+#include <QNetworkAddressEntry>
 #include <stdlib.h>
 
 #include "filesystemwatcher.h"
@@ -1696,7 +1699,22 @@ void Bittorrent::addConsoleMessage(QString msg, QString) {
   // session will listen to
   void Bittorrent::setListeningPort(int port) {
     std::pair<int,int> ports(port, port);
-    s->listen_on(ports);
+    const QString& iface_name = Preferences::getNetworkInterface();
+    if(iface_name.isEmpty()) {
+      s->listen_on(ports);
+      return;
+    }
+    QNetworkInterface network_iface = QNetworkInterface::interfaceFromName(iface_name);
+    if(!network_iface.isValid()) {
+      s->listen_on(ports);
+      return;
+    }
+    QString ip = "127.0.0.1";
+    if(!network_iface.addressEntries().isEmpty()) {
+      ip = network_iface.addressEntries().first().ip().toString();
+    }
+    qDebug("Listening on interface %s with ip %s", qPrintable(iface_name), qPrintable(ip));
+    s->listen_on(ports, ip.toLocal8Bit().constData());
   }
 
   // Set download rate limit

src/preferences.h

@@ -929,6 +929,16 @@ public:
     settings.setValue(QString::fromUtf8("Preferences/Connection/MaxHalfOpenConnec"), value);
   }
 
+  static void setNetworkInterface(QString iface) {
+    QSettings settings("qBittorrent", "qBittorrent");
+    settings.setValue(QString::fromUtf8("Preferences/Connection/Interface"), iface);
+  }
+
+  static QString getNetworkInterface() {
+    QSettings settings("qBittorrent", "qBittorrent");
+    return settings.value(QString::fromUtf8("Preferences/Connection/Interface"), QString()).toString();
+  }
+
 #ifdef LIBTORRENT_0_15
   static bool isSuperSeedingEnabled() {
     QSettings settings("qBittorrent", "qBittorrent");