[Dovecot] v2.0 configuration parsing

[Felix Schueren]

Timo Sirainen wrote:
> I'm trying to figure out how exactly v2.0 should be parsing
> configuration files. The most annoying part is if it should always just
> "use whatever comes first in config" or try some kind of a "use most
> specific rule". The "most specific" kind of makes more sense initially,
> but then you start wondering how to handle e.g.:
> 
> 1) User logs in to imap from 192.168.0.1. What is foo's value?
> 
> protocol imap {
>   remote_ip 192.168.0.0/16 {
>     foo = foo
>   }
> }
> remote_ip 192.168.0.0/24 {
>   foo = bar
> }
> 


make it
protocols {
  imap {
    remote_ip x/16 {
      foo = foo
    }
  }
  all {
    remote_ip x/24 {
      foo = bar
    }
  }
}

> 2) User logs in from 192.168.0.1 to 10.1.2.3. What is foo's value?
> 
> local_ip 192.168.0.1 {
>   remote_ip 10.1.2.0/24 {
>     foo = foo
>   }
> }
> remote_ip 10.1.2.3 {
>   local_ip 192.168.0.0/24 {
>     foo = bar
>   }
> }
> 
I'd strongly suggest to use the same approach as firewalls (or exim):
first match wins. I love exim because I can configure it much like my
firewalls & routers, and the "fall through until something matches"
syntax that most firewalls/ACLs use is well-understood & flexible.

Kind regards,

Felix

-- 
Felix Schüren
Head of Network

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