[Dnsmasq-discuss] --synth-domain enhancement

[Simon Kelley]

On 23/01/18 09:25, Andy Hawkins wrote:
> Hi,
> 
> I'm contemplating a move from bind and isc-dhcpd to dnamasq. 
> 
> One of the features of bind that I take advantage of in my domain is
> generating sequences of DNS entries using a single line. For example, in my
> zone file I have:
> 
> $GENERATE 50-70 dyn-${-50}      IN      A       192.168.202.$
> 
> This will generate the following DNS entries:
> 
> dyn-0.gently.org.uk on address 192.168.202.50
> dyn-1.gently.org.uk on address 192.168.202.51
> 
> ...
> 
> dyn-19.gently.org.uk on address 192.168.202.69
> dyn-20.gently.org.uk on address 192.168.202.70
> 
> I realise that dnsmasq has the 'synth-domain' option, but the names
> generated by this are a little ugly. Is there any chance an enhancement
> could be made to so something similar to the facilities available in bind?
> 

It could be done: just requires even more scary string-mangling in
src/domain.c and inventing a way to configure it.

I prosose something like

 --synth-domain=thekelleys.org.uk,192.168.0.0/24,internal-*

where the final * in the prefix generates "counting mode" so that

192.168.0.0 becomes internal-0,thekelleys.org.uk

A range rather than a subnet is already allowed, so your example becomes


 --synth-domain=gently.org.uk,192.168.202.50,192.168.202.70,dyn-*


Anyone got a better idea?


Cheers,

Simon.