[Pdns-users] Fancy-records and urlredirector

[Joe Baptista]

fancy records sound alots like a fancy form of cname.  interesting
feature.

Joe Baptista - only at www.baptista.god

"Who are in control, they are not in control of anything - they don't
even control themselves!"
 ... Muhammed Saeed al-Sahaf former Iraqi Information Minister

On Thu, 12 Jun 2003, A/S ScanNet - Dan Faerch wrote:

> > traffic directly, but only URL requests from PDNS.
> No.. PDNS does not do anything but dns.. No proxy or tunnneling or the
> likes..
> What PDNS does with a fancy record is simply returning an A record..
> You have eg:
> www.test.com - URL - http://whatever.com
> in your zone.
>
> A user types www.test.com in his webbrowser..
>
> Powerdns looks into the zone, finds type=URL.. Then it takes the IP if the
> URL-redirector (specified in config).. Lets say it has 194.255.66.1.
> Now powerdns returns the following to the webbrowser:
>
> www.test.com - A - 194.255.66.1
>
> and the webbrowser goes to 194.255.66.1 port 80 (as with any normal
> webbrowser request)..  The webbrowser then communicates with 194.255.66.1 as
> it would with any other webserver.. The webbrowser (roughly) sends something
> like this to 194.255.66.1:80.:
> GET / HTTP/1.1
> User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)
> Host: www.test.com
>
>
> You have to somehow look into the PDNS-database to find the "content" field
> according to the "Host:" header.. In my example it was http://whatever.com.
> Now WHAT you do with this info is up to you..
> Maybe you could port forward or proxy according to the "Host:" header.. Or
> simply redirect as i do.. Eitherways, youd proberbly have to code a little
> something..
> You proberbly could have a "content" field containing an 10.0.0.x ip address
> and somekinda proxy on 194.255.66.1.
>
> But i do not know of any software that can do this without modifying it
> first..
>
>
> -Dan Faerch
> A/S ScanNet
>
> ps. the pdns server and the 194.255.66.1 be the same server (hell, even same
> ip), but that does still not make it a proxy.. :)
>
>
>
> >
> > > Im not sure if you can make it work with mod_rewrite.. You have
> > > to look into the database everytime someone requests a domainname..
> > > Pesonally we use a PHP script to do the trick..<snip>
> >
> > That would work fine, except I have 10 servers behind the PDNS server, and
> > no way to determine which server should recieve the request in the first
> > place,
> > so it will (and does) die at the PDNS server. I have A records for all the
> > domains I host, just no way to point them at their respective servers.
> > My setup is like so...
> >
> > Internet
> >    |
> > x.x.x.x (Internet IP)
> > PDNS_1
> > 10.0.0.1 (PDNS Server)
> >    |
> > Switch
> > ||||||
> > WWW_1 - 10.0.0.10 (needs to answer for www.domain1.com, www.another1.com,
> > etc)
> > WWW_2 - 10.0.0.11 (needs to answer for www.domain2.com,
> > www.stillanother.com, etc)
> > ...
> > WWW_10 - 10.0.0.20 (needs to answer for www.domain10.com,
> > www.yetanotherdomain.com, etc)
> >
> > So if an http-request is recieved by PDNS_1 on it's internet interface for
> > www.domain2.com, I need it to be able to forward on the request to the
> > proper
> > machine, WWW_2 in this case. Simple port-forwarding won't work, and the
> > private
> > IP's of the WWW_* machine's make for very bad A records :) I can only
> think
> > that
> > if the urlredirector will work the way I imagine it, I can either use
> Apache
> > or
> > write a little lightwieght app to do the proper routing behind the PDNS
> > server for me.
> > If it doesn't, I guess I'm up the proverbial creek, but I can't help
> > thinking that
> > I can't be the only one who's ever needed to do this. Or perhaps it's
> simply
> > my
> > network setup/topology is all wrong for what I'm trying to accomplish.
> > Thanks for the
> > script though, I might be able to adapt it to work from the PDNS server,
> who
> > knows! :)
> >
> > D.Mills
> >
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> >
> >
>
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