[Pdns-dev] lua script to synthesize AAAA record from A record

[Peter van Dijk]

Hello Muntasir,

On May 4, 2012, at 6:47 , Muntasir Rahman wrote:

> function nodata ( remoteip, domain, qtype, records )
>     print ("nodata called for: ", remoteip, getlocaladdress(), domain, qtype)
>     if qtype ~= pdns.AAAA then return -1, {} end  --  only AAAA records
>     setvariable()
>     return "getFakeAAAARecords", domain, "fe80::21b:77ff:0:0" -- here i need to return ::ffff:ipv4.dotted.decimal.format
> end 
> 
> I would like to do something like this
> 
>     ipv4 = "1.2.3.4" -- how do i get this data from recursor ??? 
>     ipv6 = "::ffff:" .. ipv4  -- synthesized representation of IPv4 in IPv6
>     return "getFakeAAARecords", domain, ipv6
> 
> My question is:
> - how do i get IPv4 data using lua API in above script examples?

You don't. getFakeAAAARecords handles this. Just returning "getFakeAAAARecords", domain, "0:0:0:0:0:ffff:0:0" should work.

(You can't say "::ffff" or "::ffff:" - the first would cause the v4 address to just overwrite those bits and the last would be a parse error).

Kind regards,
-- 
Peter van Dijk
Netherlabs Computer Consulting BV - http://www.netherlabs.nl/