confused with unlang

[Alan DeKok]

Wayne Lee wrote:
> I'm getting myself confused with unlang and hoping somebody can help.
> I have read the docs but just don't fully get it.

  "unlang" is just a simple set of comparisons and logic.

> I'm trying to filter requests by part of the calling-station-id and
> update/rewrite the reply depending on what group it is in. The below
> is what I've got in the config
> 
> 
> post-auth {
> 
> if(Calling-Station-Id >= "foo") {

  You're doing "greater than or equal" checks on a string?

>         if(SQL-Group == "SR1"){
>                 update reply {
>                 Tunnel-Server-Endpoint := 192.168.1.1
>                 Tunnel-Type := L2TP
>                 Tunnel-Medium-Type := IP
>                 Cisco-AVPair := vpdn:tunnel-id=provider.net
>                 Cisco-AVPair := vpdn:l2tp-tunnel-password=abc
>                 Framed-Protocol -= PPP
>                 Service-Type -= Framed-User
>                 Port-Limit -= 32

  It's always better *not* add attributes, rather than adding them and
later deleting them.

> The provider is sending "foo" or "bar" (depends on the LTS) and a ID
> number in the calling-station-id which is why I used ">=".

  Regexes are better at string matches than numerical comparison operators.

> Further to that, when the provider sends bar and the user is not in
> group SR1 i need to reply with a different tunnel-server-endpoint.
> I understand why it's not working due to the use of ">=" but I don't
> know how to fix it, I've tried using else statements/clauses but I'm
> lost. We are using multiple LNS's (some dedicated for customers or
> service).

  Use regexes.  Run the server in debugging mode to see what is being
matched, and why.

  Alan DeKok.