13 Zář
2023
13 Zář
'23
15:03
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
15 Zář
15 Zář
13:04
Hello.
On 13/09/2023 15.03, Blažej Krajňák wrote:
I don’t know how to iterate
“query.request.qsource.headers”.
These C structures have nice Lua bindings. I believe you can just
for-loop from headers.at[0] up to headers.at[headers.len - 1]
Generally, in almost all cases we use just this auto-mapping between C
and Lua: https://luajit.org/ext_ffi_tutorial.html#idioms
(I don't recall if all http headers get always pulled into this
structure, but you should see that practically soon.)
--Vladimir
13:23
On 15/09/2023 13.04, Vladimír Čunát wrote:
(I don't recall if all http headers get always
pulled into this
structure, but you should see that practically soon.)
After remembering a bit more and looking into source, you need to
configure in advance the header names that would get pulled into that
place. In your case that should be simply adding one line into your
config (outside the callbacks)
net.doh_headers({ 'user-agent' })
17 Zář
17 Zář
15:50
Hello,
thanks for hints. I got it working and I’m successfully counting what I need.
function count_chrome_doh()
return function (state, query)
if query.request.qsource.flags.http then
for i = 1, tonumber(query.request.qsource.headers.len) do
local k = ffi.string(query.request.qsource.headers.at[i - 1].name)
local v = ffi.string(query.request.qsource.headers.at[i - 1].value)
if k == 'user-agent' and v == 'Chrome' then
stats['request.agent.chrome'] =
stats.get('request.agent.chrome') + 1
return nil
end
end
end
return nil
end
end
stats['request.agent.chrome'] = 0
net.doh_headers({'user-agent'})
policy.add(count_chrome_doh())
Dňa 15. 9. 2023 o 13:23, Vladimír Čunát
<vladimir.cunat(a)nic.cz> napísal:
On 15/09/2023 13.04, Vladimír Čunát wrote:
(I don't recall if all http headers get
always pulled into this structure, but you should see that practically soon.)
After
remembering a bit more and looking into source, you need to configure in advance the
header names that would get pulled into that place. In your case that should be simply
adding one line into your config (outside the callbacks)
net.doh_headers({ 'user-agent' })
--
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3 comments
2 participants
participants (2)
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Blažej Krajňák -
Vladimír Čunát