Respond to DHCP Lease Query requests using rlm_cache

[Бен Томпсон]

Hi Arran

Thanks for your reply. The problem is that when the server recives a
LEASEQUERY packet I get the following error:

  Error: DHCP can only receive ethernet requests, not type 00


Thanks

Ben



On 28 August 2015 at 00:06, Arran Cudbard-Bell <a.cudbardb at freeradius.org>
wrote:

>
> > On Aug 27, 2015, at 2:40 PM, Бен Томпсон <b.thompson at latera.ru> wrote:
> >
> > Hi Everyone
> >
> > I have configured FreeRADIUS to as a DHCP server which offers IP
> addresses
> > based on the option 82 values added by a DHCP relay. In cases where the
> > client sends a unicast renew request bypassing the relay, the option 82
> > values are queried from an instance of rlm_cache which have configured to
> > keep a record of leases. (This replicates the option 82 "Stash"
> > functionality in ISC DHCP Server). A bit of unlang is involved to check
> > that the lease is valid and take care of clearing out the cache, but it
> is
> > all fairly simple.
> >
> > The aformentioned server is working well, but I would also like it to be
> > able to respond to Lease Query requests, and wondered if it would be
> > possible to make it work in a similar way using rlm_cache. I would
> envisage
> > that configuration might look something like this:
> >
> > dhcp DHCP-Lease-Query {
> >        # look in the cache to see if there is an active lease
>
>
>         update control {
>                 Cache-Status-Only := yes
>         }
> >       cache
>         if (notfound) {
> >                       # check to see if we know about this IP
> >                       ...some unlang lookup the IP from our usual auth
> source/DB
>
>                 cache
>         }
>
> >        ...
> >        ... some unlang to figure out if the lease(s) are valid, etc.
> >        ...
> >
> >        # work out which type of reply packet is requred and add the
> > relevant options
> >        if (result of above says lease is active) {
> >                update reply {
> >                        DHCP-Message-Type := DHCP-Lease-Active
> >                        ... add some other stuff to the reply...
> >                }
> >        }
> >        elsif (result of above says lease is unassigned) {
> >                update reply {
> >                        DHCP-Message-Type := DHCP-Lease-Unassigned
> >                        ... add some other stuff to the reply...
> >                }
> >        }
> >        elsif (result of above says lease is unknown) {
> >                update reply {
> >                        DHCP-Message-Type := DHCP-Lease-Unknown
> >                        ... add some other stuff to the reply...
> >                }
> >        }
> > }
> >
> > I am guessing that the source code would need to be modified, and if so,
> it
> > may be too much for me as I am not a skilled C programmer. I would be
> able
> > to test it however.
>
> I don't *think* code modifications are required.
>
> Did you just need to right control attributes for the cache module? Or
> something else...
>
> If you need the cache to persist you should setup a memcached instance (or
> use v3.1.x and setup a Redis instance).
>
> -Arran
>
>
> -
> List info/subscribe/unsubscribe? See
> http://www.freeradius.org/list/users.html
>



-- 
Бен Томпсон,
инженер отдела внедрения и техподдержки,
компания "Латера" | www.latera.ru

тел.: +7 (499) 940-95-05, доб. 221
E-mail: b.thompson at latera.ru

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