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List:       kfm-devel
Subject:    Re: Fwd: SRV support in konqueror ?
From:       Peter_Håkanson <peter () ipsec ! nu>
Date:       2001-07-24 19:09:26
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On Tue, 24 Jul 2001, Waldo Bastian wrote:
Waldo and Thiago,

getaddrinfo() won't do this as i see ( in freebsd ), it just calls
getservbyname() which cannot do this since it doesn't know the
hostname.
Neither does getaddrinfo returns the <prio> and <weight> parameters.

So i guess that what is needed is to call res_init and formulate 
the question self ( that should be supported in all un*x libs anyway )

The effort needed should not be gigantic however, one 
only has to retreive a single SRV record and use for obtaining 
hostname and portnumber, maybe just before calling getaddrinfo.

I'm just trying to get kdebase2 to compile on freebsd 4.3, 
atthe moment i have problems with :
/usr/local/include/krun.h:110: syntax error before `&

These headers seems to be installed faulty, and i try to get 
the right kits out of freebsd port system :-)

If i get konqueror to compile may i ask, what module does
call getaddrinfo() ? I have searched the whole kdebase for that
but not found it :-(

regards
Peter h
> We pretty much depend on the operating system to do the DNS for us. We use 
> getaddrinfo(3) to do name lookups. getaddrinfo is part of glibc and I assume 
> that support for SRV should be added there.
> 
> Thiago is our DNS expert though, maybe he can give you a better answer.
> 
> See http://sources.redhat.com/glibc/ for how to reach the glibc developers.
> 
> Cheers,
> Waldo
> 
> On Tuesday 24 July 2001 08:45 am, David Faure wrote:
> > Can someone answer this ? I have no clue about this stuff.
> >
> > ----- Forwarded message from Peter Håkanson <peter@ipsec.nu> -----
> >
> > Date: Tue, 24 Jul 2001 14:40:10 +0200 (CEST)
> > From: Peter Håkanson <peter@ipsec.nu>
> > To: faure@kde.org
> > Subject: SRV support in konqueror ?
> >
> > Hi,
> >
> > I hope i address the right person here, but i would like
> > an added feature in konqueror, namely the ability to
> > examine and follow DNS SRV records.
> >
> > SRV records are a new feature in DNS that makes it possible
> > to locate "services" in the same way as "MX" records deals
> > with mail addresses.
> >
> > Until SRV records were defined no way existed to tell which
> > port a server application used. Thus all servers had to reside
> > on the IANA-defined port.
> >
> > With SRV records the intention is that an application that
> > wishes to reach a server should ask DNS for a "SRV" first,
> > if it founds one use the server and port given to connect. If
> > none is foundm it will ask for "A" ( or usually "ANY" and
> > follow "CNAME" or "A" records found.
> >
> > SRV records would be just perfect for http, the reson is that
> > one often wants several "logical" servers in the same machine.
> > Previously this was achieved by useing several ip-addresses and
> > having (apache) listen on the indivitual addresses. To reduce
> > the need for addresses url-based mechanisms was designed,
> > but the problems were several.
> >
> > SRV on the other hand would deal with this in a better way, the general
> > format is
> > <key> IN  SRV  <prio> <weight> <port> <domain-name-of-server>
> >
> > So a webserver is described not only which port to be used,
> > but also a way of describing several servers, who's order
> > to be contacted is definedm and a crude way of load-balancing
> > ( broken in my opinion) is defined + the servers domain name.
> >
> > The key is built up with a special way , assume you want to
> > reach www.ipsec.nu , then the key is :
> > _http._tcp.www.ipsec.nu
> >
> > Any SRV record found for that record will describe not only
> > which server(s) but also at which ports to use.
> >
> > Thus a webserver for 100 domains need only one ip-address, but
> > has a server on 100 different ports.
> >
> > Why is this not used today ? Well no browser to my knowledege
> > has the ability do do this. Thus no web-owner cares about
> > SRV. Someone has to start. I think the KDE project would
> > be an excellent starting point ( "the only modern browser" )
> >
> > I have prepared SRV records for www.ipsec.nu ( and www.ipsec.se)
> > for testing purposes ( they point to my ordinary server, but
> > that could be adjusted)
> >
> > Now, if i want SRV records, why don't i grab the source ? Well
> > i have i freebsd 4.3 system where i can do this. I am however
> > an amatour with c++ and not really confident. I'll try anyway.
> > If i get it working, how do i contribute the result ?
> >
> > Now, is there any interest from the KDE project ? I can
> > contribute with DNS knowledge ( this is my living), but i
> > am not shure that i can modifu the source as you your
> > standards.
> >
> > Regards
> 
> -- 
> Andrei Sakharov, Exiled 1980-1986, USSR, http://www.aip.org/history/sakharov/
> Dmitry Sklyarov, Detained 2001-????, USA, http://www.elcomsoft.com/
> 

--  
-- quote of the week 
        There's never money to do it right, but always money to do it
	again ... and again ... and again ... and again.

=========================================================================
Peter Håkanson            Phone     +46707328101       Fax +4631223190
IPSec sverige                Email      peter@ipsec.nu  
"Safe by design"             Address    Bror Nilssons gata 16  Lundbystrand
                                        S-417 55  Gothenburg   Sweden         

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