powerdns-filtering.lua

powerdns-filtering.lua

-- Define new Domain Set
blocked_domains=newDS()
-- Load Domain Set from the file. Format of the file is: 'return {"a.com", "b.com", "a.fb.com"}'
blocked_domains:add(dofile("/etc/powerdns/full_list_13-11-2019.lua"))

-- define a preresolve() function which gets called by PowerDNS to determine what to do with a domain
function preresolve(dq)
    -- If we see that a query name is not part of one of the blocked domains,
    -- or the query is not for an IP(v6) address, we return false and the normal resolution process continues.
    if(not blocked_domains:check(dq.qname) or (dq.qtype ~= pdns.A and dq.qtype ~= pdns.AAAA)) then
        return false
    end

    -- Otherwise if it is a domain to be blocked,
    -- we insert a SOA record that says "this domain name exists, but the type you queried for doesn’t".
    dq:addRecord(pdns.SOA,
        "fake."..dq.qname:toString().." fake."..dq.qname:toString().." 1 7200 900 1209600 86400",
        2)
    return true
end