[Dnsmasq-discuss] Add address file option

[Simon Kelley]

Don Muller wrote:
> Hi Simon,
> 
>  
> 
> I have another suggestion that I hope you don’t talk me out of J.
> 
>  
> 
> In the config file or command line you can specify an IP address to
> return for any host in the given domains via
> 
>  
> 
> address=/<domain>/[domain/]<ipaddr>
> 
>  
> 
> While this is nice, every time you add an entry you have to restart
> dnsmasq. At least I think you do. I’d like to ask for the ability to
> specify a file to read that contains these entries which will be reread
> upon receipt of the SIGHUP signal.
> 

This isn't as easy as it looks:

address=/<domain>/<ipaddr>

is a variant of

server=/<domain>/<ipaddr>

almost all of the code-paths are shared. There's a variant of the
server= config

server=/<domain>/<ipaddr>@<ipaddr>#<port>

which allows specification of the local address and port. If the port is
less than 1024, binding that needs root, hence it can't be done on a
restart.

I'd be rather more inclined to extend the DBus interface, which allows
dynamic setting of servers (but not source ports)

I'm still bewildered why people are so allergic to restarting dnsmasq:
it takes almost no time, doesn't disrupt existing connections and the
only state lost is the cache, which is quickly and transparently replaced.

Cheers,

Simon.