[PATCH] DNS cache for Konqueror/KIO

Allan Sandfeld Jensen kde at carewolf.com
Mon Jun 23 09:34:06 BST 2008

On Sunday 22 June 2008, Roland Harnau wrote:
> KIO's asynchronous design and some peculiarities in Qt's network
> department often result in concurrent  queries to resolve host names,
> especially if Konquerer launches its huge slave army. As witnessed by
> several bug reports (e.g. 162600)  some kind of router can't cope with
> this very well. The reason (at least in my case) is not the "crappy"
> handling of IPv6 queries in itself. An analysis with tcpdump reveals
> there are in general problems with concurrent queries to resolve the
> same name if the requested record (AAAA or A) does not exist. A
> solution (or workaround, as you like it) is a local DNS cache. The
> core of my patch is therefore a reimplementation of Qt's asynchronous
> resolver QHostInfo::lookupHost  in form of
> HostInfoAgent::lookupHost.with integrated cache and its integration
> into KIO. The cache lives in a central place,  in the application's
> address space,  but is used by  several slaves (instances of classes
> derived from TCPSlaveBase) living in separate process contexts. So
> some IPC is necessary, and I have simply used the socket connection
> between the slave and its counterpart in the application's address
> space.
Thank you! I've wanted this feature for a long time. Now how are we going to 
convince TPTB to let us merge it into KDE 4.2? :D


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