[Pdns-users] Recursor and LUA scripting: I don't understand why preresolve answering a CNAME won't cascade to other records

[Roman Steinhart]

Hi,
If I'm not wrong you need to tell pdns to resolve the CNAME:
https://doc.powerdns.com/recursor/lua-scripting/hooks.html#cname-chain-resolution

Regards,
Roman

Am So., 31. Mai 2020 um 12:08 Uhr schrieb Oscar Koeroo via Pdns-users <
pdns-users at mailman.powerdns.com>:

> Hi,
>
> I’m using my the Recursor version 4.3.1 on my Pi and building the
> following. I have a VPS and a home-server. I use “domain.net” for the
> internet access and in my home I use “domain.local”.
>
> Due to NAT and how my home router works, I intercept the DNS requests and
> provide a local answer instead of the WAN IP address for example. In other
> case I would like to use “domain.net”
>
>
> I’m using the following LUA script to intercept, but I don’t understand
> the results. Why doesn’t the dig get the CNAME to got to the A record I
> have in my domain.local zone? I expected dig to try to get the CNAME value
> of qr.domain.net and the CNAME value of that result, which seems to halt
> there.
>
>
>
>
> The expected result I was looking for was:
>
>
> dig qr.domain.net
>
> ;; ANSWER SECTION:
> qr.domain.net.          3600    IN      CNAME   qr.domain.local.
> qr.domain.local.        41584   IN      CNAME   apps.domain.local.
> apps.koeroo.local.      40931   IN      A       192.168.1.28
> - EOL
>
>
>
> I got:
>
>
> dig qr.domain.net
>
> ;; ANSWER SECTION:
> qr.domain.net.          3600    IN      CNAME   qr.domain.local.
> - EOL
>
>
> dig cloud.domain.net
>
> ;; ANSWER SECTION:
> cloud.domain.net.       3600    IN      A       192.168.1.15
> - EOL
>
>
>
> Script:
>
> function preresolve(dq)
>     if dq.qtype == pdns.A then
>         if (dq.qname:toString() == "cloud.domain.net.") then
>             pdnslog("preresolve: " .. dq.qname:toString(),
> pdns.loglevels.Info)
>             dq:addAnswer(pdns.A, "192.168.1.15")
>             dq.rcode = pdns.NOERROR
>             return true
>         elseif (dq.qname:toString() == "vpn.domain.net.") then
>             pdnslog("preresolve: " .. dq.qname:toString(),
> pdns.loglevels.Info)
>             dq:addAnswer(pdns.A, "192.168.1.37")
>             dq.rcode = pdns.NOERROR
>             return true
>         elseif (dq.qname:toString() == "qr.domain.net.") then
>             pdnslog("preresolve: " .. dq.qname:toString(),
> pdns.loglevels.Info)
>             dq:addAnswer(pdns.CNAME, "qr.domain.local")
>             dq.rcode = pdns.NOERROR
>             return true
>         end
>     end
>     return false
> end
>
>
> Oscar Koeroo
>
>
>
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