[Qt-interest] QNetworkInterface::allInterfaces does not return interfaces without an IP address?

[Jeroen De Wachter]

Hello,

I've been testing some things regarding QNetworkInterface and I've
noticed that when I call QNetworkInterface::allInterfaces on a system
that does not have IPv6 support, only the interfaces that are up are
returned.

When I enable IPv6 support in my uClibc-based toolchain (but not in the
kernel), different calls are used and I do get all interfaces and all
their addresses.

This seems due to the way QNetworkInterface gets the interface names and
interface information in qnetworkinterface_unix.cpp

I still need to look further into why this happens exactly (lots of
#ifdef in there), but I wanted to check if anyone else has seen this
issue.

Also, I wanted to ask, if a Linux system is detected, why doesn't Qt use
a more standardized way of doing things? ifconfig parses
the /proc/dev/net file, for instance, while the ip command is using the
netlink interface. (though I guess there would need to be a fallback for
the netlink stuff... Qt will likely run on older kernels that don't
support it.)

I'm working with Qt 4.5.1, by the way. Don't shoot me if this has been
dramatically altered in 4.5.2 or the git repository...

Kind regards,

Jeroen

Software Design Engineer
Barco N.V.


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