[Kea-users] Flex options hook library

[Christoph Pleger]

> 
Hello,

> > In fact you have two cases:
> >  - the option gets a static value -> use a standard config to
> > assign
> >   this value to the option in responses
> >  - the option gets a dynamic value i.e. a value based on a dynamic
> > field
> >   in requests -> use the flex-option hook
> > In both cases it is often easier to use a client class to summarize
> > a condition (easier to configure and even more important easier to
> > debug).
> 
> But the question still remains:
> 
> Is it somehow possible to use someting like
> 
> {
>    "Dhcp4": {https://kea.readthedocs.io/en/kea-1.8.0/arm/config.html
>        "hooks-libraries": [
>            {
>                "library": "/usr/local/lib/libdhcp_flex_option.so",
>                "parameters": {
>                    "options": [
>                        {
>                            "code": 67,
>                            "add": "ifelse(option[host-
> name].exists,concat(option[host-name].text,'.boot'),'')"
>                        }
>                    ]
>                }
>            }
>        ]
>    }
> }
> 
> with an add: component that uses an option string that has not been
> already set in the client request, but only in the server reply.

If not with option values, maybe with values from user-context?
https://kea.readthedocs.io/en/kea-1.8.0/arm/config.html says that user
contexts are exposed to hooks, but I did not find documentation about
how to reference their data.

Regards
  Christoph
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