[Pdns-users] pdns-recursor 3.7.4 on Redhat Linux always returns SERVFAIL for AAAA lookups

[Peter van Dijk]

Hello Kenneth,

On 16 Aug 2017, at 18:11, Kenneth Marshall wrote:

> pdns_recursor[3935]: DNS parser error (a.b.c./AAAA from 127.0.0.1): 
> a.b.c., Parsing record content: missing field at the end of record 
> content ''
>
> from the following lua script:
>
> function preresolve ( remoteip, domain, qtype )
>   ret={}
>   if qtype == pdns.AAAA and domain == "a.b.c." then
>     pdnslog ("fixing AAAA query " .. domain)
>     ret[1]={qtype=pdns.AAAA, content=""}
>     return 0, ret
>   end
>   return -1, ret
> end

You are passing the recursor an AAAA record with no content. Here is how 
do it in v4: 
https://github.com/PowerDNS/pdns/blob/master/pdns/recursordist/examples/strip-ipv6-from-domains.lua

In your case, just leave ret empty instead of putting an ‘empty’ 
AAAA in it.

Kind regards,
-- 
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/