QWebkit: downloading a page using a specific network interface

sergico

Hi Everybody,

I have a PC with two network interfaces; eth0 and eth1
eth1 has no IP address but it is bound to a ppp connection

eth0 Link encap:Ethernet HWaddr 00:26:18:f1:91:d1
inet addr:192.168.23.7 Bcast:192.168.23.255 Mask:255.255.255.0

ppp0 Link encap:Point-to-Point Protocol
inet addr:192.168.60.7 P-t-P:192.168.60.213 Mask:255.255.255.255

I'd like is to be able to use Qt webkit to download pages using the ppp0 and not the eth0 interface.

What I did at code level using Qt is the following:

Retrieve the list of available network configurations
Select the network configuration associated with the ppp0 iface
create a QNetworkAccessManager
set the configuration of the QNetworkAccessManager
create a QWebPage
set the network access manager of the webpage to the above one
load the webpage

Unfortunately it seems that the data always exit via the eth0 iface (I monitored both ifaces with wireshark/tcpdump) The problem is not related to the routing configuration of the PC, I configured the system so that I can send packets out via the ppp0 iface.

ie. ping -c 3 -I 192.168.60.7 www.google.com is correctly routed out via the ppp0 iface

Here's a snapshot of my code:

@
QNetworkConfigurationManager* m_netConfigMngPtr;
QNetworkAccessManager* m_netAccessMngPtr;

m_netConfigMngPtr = new QNetworkConfigurationManager();
qDebug() << "network config manager capabilities" << m_netConfigMngPtr->capabilities();

QList<QNetworkConfiguration> netConfigList = m_netConfigMngPtr->allConfigurations();

QString ifaceId;
qDebug() << Q_FUNC_INFO << "Available Networck configurations:" << netConfigList.size();
foreach( QNetworkConfiguration c, netConfigList)
{
qDebug() << Q_FUNC_INFO << "network configuration:" << c.identifier() << c.name() << c.state() << c.isValid();
if (c.name() == "ppp0")
{
ifaceId = c.identifier();
}
}

QNetworkConfiguration netConf = m_netConfigMngPtr->configurationFromIdentifier(ifaceId);
qDebug() << "Net config for " << ifaceId << "(" << netConf.name() << ")" << "is valid: " << netConf.isValid();

m_netAccessMngPtr = new QNetworkAccessManager;
m_netAccessMngPtr->setConfiguration( netConf );

QWebPage* m_theWebPagePtr = new QWebPage;
m_theWebPagePtr->setNetworkAccessManager(m_netAccessMngPtr);
m_theWebPagePtr->currentFrame()->load( QUrl("http://www.google.com") );

@

I'm using Qt 4.8.1 on Linux 64bit
Any hint or suggestion on what I'm doing wrong?