[Recursor] How to skip cache for a specific pattern of queries?

[AxelBomp]

Hi,

We're using PowerDNS Recursor 5.2.0 and we are trying to disable cache for certain request patterns. For example : when a client requests "blablabla.com", the recursor should not cache the answer.

So far we tried:

• The preresolve() function and "dq.variable = true", but it doesn't seem to work as we can't resolve our records anymore.

• The postresolve() function, like this (with and without the dq.variable // with a ttl set at 1 second):

function postresolve(dq)
pdnslog("postresolve called for "..dq.qname:toString())
local records = dq:getRecords()
for k,v in pairs(records) do
pdnslog(k.." "..v.name:toString().." "..v:getContent())
if v.type == pdns.TXT and dq.qname:toString():match("our_pattern") then
pdnslog("Changing ttl!")
v.ttl = 1
dq.variable = true
end
end
dq:setRecords(records)
return true
end

But it doesn't work either, the answer is still cached.

Any (simple) idea?

Thanks in advance!