dynamic lookup of list entries

Alan DeKok aland at deployingradius.com
Fri Jan 26 16:59:35 UTC 2024

On Jan 26, 2024, at 8:47 AM, James Potter via Freeradius-Users <freeradius-users at lists.freeradius.org> wrote:
> Here is the situation I'm trying to get working with FreeRadius, but having tried a load of variations around this I'm still stuck.

  Trying random things is usually an exercise in frustration.

> I have a list of sites with specific VLANs I'd like users to end up on:
> sites {
>                1 {
>                                vlan = 234

  I'm presuming you put that into the configuration files somewhere?

> I then have some clients, each with a site assigned:
> client cli1 {
>                ipaddr =
>                secret = asdfasdf
>                site = 1
> }


> I'd now like to assign the VLAN from sites, something like:
> post-auth {
> update reply {
>                               Tunnel-Private-Group-ID = ${sites[${client.site}].vlan}

  That's close, but not quite correct.  The ${...} syntax is really just a macro replacement for when the server is starting up.  It's not a run-time lookup.

  i.e. when you want "get me client information", you're not ${client}, because that doesn't refer to *any* client.

  What you want is "the current client that the packet comes from", which is %{client:...}

  You also want run-time lookups for the configuration entries, which is %{config:...}

  Putting out all together gets you:

	Tunnel-Private-Group-ID = %{config:sites[%{client.site}].vlan}

  That should work, I think.

  Alan DeKok.

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