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  1. Qt
  2. QTBUG-78934

QNetworkAccessManager denies to use user prefered network configuration

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    • Linux/X11

    Description

      Hello there!

      It looks like a bug to me , but maybe I'm wrong and its indeed a wanted functionallity. 

      So in my case I try to set a specific network configuration named "wlan0"(other then the   QNetworkConfiguration::defaultConfiguration named "eth0") to a QNAM wich then should be used for all HTTP method calls like   QNetworkAccessManager::get, post, put etc

      QNetworkConfigurationManager config_manager;
QList<QNetworkConfiguration> configs = config_manager.allConfigurations();
for(const QNetworkConfiguration &config: configs) {
    if (config.name() == QStringLiteral("wlan0") &&
            config.isValid() &&
                config.state() == QNetworkConfiguration::Active) {
        m_pManager->setConfiguration(config);
        break;
    }
}

      The "wlan0" configuration is valid and active, but the QNetworkConfiguration::defaultConfiguration will be still used by QNAM.

      I debugged the qt sources and found this piece of code (Qt/5.12.3/Src/qtbase/src/network/access/qnetworkaccessmanager.cpp:1420), which looks like a bug to me:

      if (!d->networkSessionStrongRef && (d->initializeSession || !d->networkConfiguration.identifier().isEmpty())) {
        if (!d->networkConfiguration.identifier().isEmpty()) {
            if ((d->networkConfiguration.state() & QNetworkConfiguration::Defined)
                    && d->networkConfiguration != d->networkConfigurationManager.defaultConfiguration())
                d->createSession(d->networkConfigurationManager.defaultConfiguration());
            else
                d->createSession(d->networkConfiguration);
        } 
        ....
    }

      When I do read the code right, it should be exactly the opposite :

      if (!d->networkSessionStrongRef && (d->initializeSession || !d->networkConfiguration.identifier().isEmpty())) {
        if (!d->networkConfiguration.identifier().isEmpty()) {
            if ((d->networkConfiguration.state() & QNetworkConfiguration::Defined)
                    && d->networkConfiguration != d->networkConfigurationManager.defaultConfiguration())
                d->createSession(d->networkConfiguration);
            else
                d->createSession(d->networkConfigurationManager.defaultConfiguration());
        } 
        ....
    }

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            cnn Qt Core & Network
            maxwalter79 Maximilian Walter
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              Updated:
              Resolved: