Accessing DoH headers in Lua - knot-resolver-users

13 Zář 2023

Hi there,

please, can anyone move me forward? I want to implement new stats counter for DoH requests
with “Chrome” in "user-agent" header.
I don’t know how to iterate “query.request.qsource.headers”.

I have tried:

function count_chrome_doh()
    return function (state, query)
        if query.request.qsource.flags.http then

            for k, v in ipairs(query.request.qsource.headers) do
                if v.name == 'user-agent' and v.value == 'Chrome' then
                    if stats.get('request.agent.chrome') then
                        stats['request.agent.chrome'] =
stats.get('request.agent.chrome') + 1
                    else
                        stats['request.agent.chrome'] = 1
                    end

                    return nil
                end
            end

        end

        return nil
    end
end

policy.add(count_chrome_doh())

but it falls with error "'struct 322' has no '__ipairs’ metamethod”

Thanks!
Blažej