Unlang operations with IP addresses

[Ľudovít Mikula]

Thank you Nick, that's perfect!

I was trying to do exactly the same, but couldn't find a way to cast the 
IPs ... turns out I was overcomplicating it :)

Ludo


On 11. 12. 2024 8:54, Nick Porter wrote:
> On 10/12/2024 21:29, Ľudovít Mikula wrote:
>> Ended up using sql since I already use it and the overhead is probably 
>> quite small.
>>
>> Just for reference this is what I used: &DHCP-Router-Address = "%{sql: 
>> SELECT INET_NTOA((INET_ATON('%{DHCP-Your-IP-Address}') & 
>> INET_ATON('%{%{DHCP-Subnet-Mask}:-255.255.255.0}')) +1) AS ip;}"
> 
> I had to work out something similar recently - and you can do it in 
> unlang by casting IP addresses to integers, doing the maths and then 
> casting back to IP.
> 
> For what you're doing the following would work:
> 
>          update {
>                  &Tmp-Integer-0 := &DHCP-Your-IP-Address
>                  &Tmp-Integer-1 := &DHCP-Subnet-Mask
>                  &Tmp-Integer-2 := "%{expr: (&Tmp-Integer-0 & &Tmp- 
> Integer-1) + 1}"
>                  &DHCP-Router-Address := &Tmp-Integer-2
>          }
> 
> It's not pretty, but it works - and avoids any external calls.
> 
> Nick
> 
> 
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