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zapret-lib: detect_payload_str

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bol-van
2025-12-09 12:18:59 +03:00
parent 27ef67adf9
commit 30423596ca
2 changed files with 25 additions and 0 deletions
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24
lua/zapret-lib.lua
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@@ -61,6 +61,30 @@ function posdebug(ctx,desync)
DLOG(s)
end
-- basic desync function
-- set l7payload to 'arg.payload' if reasm.data or desync.dis.payload contains 'arg.pattern' substring
-- NOTE : this does not set payload on C code side !
-- NOTE : C code will not see payload change. --payload args take only payloads known to C code and cause error if unknown.
-- arg: pattern - substring for search inside reasm_data or desync.dis.payload
-- arg: payload - set desync.l7payload to this if detected
-- arg: undetected - set desync.l7payload to this if not detected
-- test case : nfqws2 --qnum 200 --debug --lua-init=@zapret-lib.lua --lua-init=@zapret-antidpi.lua --lua-init=@zapret-auto.lua --lua-desync=detect_payload_str:pattern=1234:payload=my --lua-desync=fake:blob=0x1234:payload=my
function detect_payload_str(ctx, desync)
if not desync.arg.pattern then
error("detect_payload_str: missing 'pattern'")
end
local data = desync.reasm_data or desync.dis.payload
local b = string.find(data,desync.arg.pattern,1,true)
if b then
DLOG("detect_payload_str: detected '"..desync.arg.payload.."'")
if desync.arg.payload then desync.l7payload = desync.arg.payload end
else
DLOG("detect_payload_str: not detected '"..desync.arg.payload.."'")
if desync.arg.undetected then desync.l7payload = desync.arg.undetected end
end
end
-- this shim is needed then function is orchestrated. ctx services not available
-- have to emulate cutoff in LUA using connection persistent table track.lua_state
function instance_cutoff_shim(ctx, desync, dir)